Chevrolet Error Code Table

Chevrolet trouble codes, also known as OBD-II trouble codes, play a crucial role in accurately diagnosing and troubleshooting technical issues in Chevrolet vehicles. These standardized codes, an integral part of the On-Board Diagnostics System (OBD 2), are used to precisely identify specific anomalies in the vehicle’s operation.

There are certain vehicle models in the Chevrolet model range where error codes can occur more frequently. These include models such as the Chevrolet Silverado, Chevrolet Equinox and Chevrolet Malibu. These vehicles are characterized by their advanced electronics and complex systems, leading to increased susceptibility to error codes.

In Chevrolet cars, error codes can be two- or five-digit. The type of combination depends on the diagnostic method – in the first case, a self-test is performed, in the second, a check is performed using a computer or a diagnostic scanner.

In five-digit combinations, the first character determines whether the error belongs to the system with which the problem is associated:

  • P – failure of the vehicle engine or gearbox (automatic or manual transmission);
  • B – problems recorded in the operation of the car’s body components – the SRS passive safety system (Airbags), central locking, electric windows, etc.;
  • C – combinations related to the vehicle’s chassis and chassis;
  • U – problems with the electrical and electronic parts of the car, as well as the interaction system between the control units and the CAN bus.

The second character in the code means:

  • 0 – common sign for all codes decrypted through the OBD2 system;
  • 1 or 2 – general code of the machine manufacturer;
  • 3 – reserve character.

The third character of the error code indicates the type of malfunction:

  • 0 – vehicle systems as a whole;
  • 1 and 2 – malfunctions associated with the operation of fuel and air supply systems;
  • 3 – malfunctions in the operation of elements of the ignition system or power lines connecting them;
  • 4 – failures recorded in the operation of additional control and release mechanisms and systems;
  • 5 – malfunctions in the functioning of the components of the idle speed system of the power unit and the speed of movement;
  • 6 – malfunctions in the operation of the microprocessor control device of the engine electronic system or its electrical circuits and CAN interface, input and output pulses;
  • 7 and 8 – problems associated with the functioning of the transmission unit.

The fourth and fifth characters indicate the serial number of the error.

Contents
  1. Table with errors
  2. Description of messages from the on-board computer
  3. Description of the error
  4. Engine malfunctions
  5. Sensor malfunctions
  6. Oxygen sensor errors
  7. Wiring faults
  8. Malfunctions of electronic modules and digital communication buses
  9. Transmission faults
  10. Chevrolet Lanos self-diagnosis errors
  11. Self-diagnosis errors
  12. Description of self-diagnosis errors Chevrolet Cobalt
  13. How to diagnose the error?
  14. How to reset the error?

Table with errors

Inscription

Description of messages from the on-board computer
Change Engine Oil Soon The engine control unit warns of the need to quickly replace the engine fluid in the power unit. The first thing to do to fix the problem is to check the quality of the consumables used. If there are sediments and deposits in the oil, the fluid must be replaced.
Low Engine Oil Level B The electronic control unit (ECU) has registered a low oil level in the engine. The user needs to diagnose the volume of consumables and replenish it in case of shortage. If the lack of fluid is serious, you need to check the oil system and the engine itself for defects that could lead to leakage.
Oil Pressure Low – Stop Engine The car’s on-board computer reports a low level of engine fluid pressure in the lubrication system. If such a message appears while driving, the user needs to stop the vehicle and identify the cause. The problem is usually a failure of the engine fluid pressure controller.
Program Cluster Message from the control unit about the need to reprogram the instrument cluster. Typically, such a warning appears after replacing the indicator lights in the dashboard or tuning the panel.
Service Vehicle Soon Message about the need for prompt vehicle maintenance
Vehicle Overspeed Driver warning about speeding
Code

Description of the error
P0404 Malfunction in the exhaust gas recirculation system. Codes P0404 or 0404 appear when there is a short circuit in the line or a break in the wiring of the power system. The user needs to make sure that the position of the EGR valve corresponds to the normalized value, and also diagnose the ground circuit and the quality of contact with the wiring. If necessary, replace the valve, as well as the vacuum tube connected to it. The problem may also be a malfunction of the USR temperature controller or the presence of carbon deposits on it or a valve located in the intake manifold.
P0660 Code 0660 is a consequence of a malfunction of the system for changing the geometry of the intake manifold. The error is intermittent, so the user can try to erase it from the control unit’s memory; perhaps the code will no longer appear. If the user has recently washed the power unit, it is recommended to check all wires and connectors for moisture and oxidation on the intake manifold. The system drive unit may be faulty.
P1403 Combinations P1403 or 1403 indicate problems with the exhaust gas recirculation system. If the EGR valve breaks down, the engine idle becomes unstable, fuel consumption increases, and black smoke comes out of the muffler.

The main reasons that can lead to blocking of the exhaust gas recirculation system valve:

  • wear of the piston group of the power unit;
  • engine fluid entering the exhaust system;
  • boosting the power unit;
  • regular use of low-quality fuel;
  • wear of oil seals;
  • failure of the system valve as a result of natural wear;
  • excess level of motor fluid in the engine;
  • violation of the established operating mode of the exhaust gas system.
Code

Engine malfunctions
P0011 There is a malfunction in the operation of the variable valve timing system, the position of the camshafts is incorrect. Error P0011 is written to the control unit’s memory if delays between the actual and calculated shaft angles occur more than ten times in a row.

To clear the error after diagnostics, you need to determine the cause of the problem:

  • malfunctions in the operation of the variable valve timing system;
  • damage to the gear wheel (gear) of the shaft;
  • breakdown of the phase regulator due to contamination or when replacing the timing chain;
  • disruption of the flow of engine fluid into the piston chamber, clogging of the oil channel;
  • Damage to the power line or contact elements on the valve block.
P0012 With error P0012, the on-board computer warns the car owner about a delayed reaction when activating the system for determining the position of the intake camshaft
P0014 Code P0014 indicates an incorrect position of the engine camshaft
P0015 The engine control unit reports late operation of the exhaust camshaft position detection system. First of all, to solve the problem, it is recommended to clean the solenoid valves. If these steps do not help resolve the problem, then the elements are replaced.
P0016 Error codes P0016 and 0016 indicate a problem with the connection between the crankshaft and camshaft. First of all, you need to make sure that the pulleys and timing belt/chain are intact. You also need to make sure that the marks on the shafts match.
P0017 Code P0017 appears if the crankshaft is incorrectly positioned. The problem must be looked for in the device sensor or in the pulley itself. The cause may be damaged teeth on the gears or a malfunctioning regulator.
P0300 The combination P0300 or 0300 indicates misfire in one or more cylinders. The problem may be occasional or permanent. Typically, the error occurs as a result of damage to the catalytic converter or increased toxicity. The problem may be a critically low level of compression in the cylinders or a malfunction of elements of the ignition system, including the switchgear, coils or spark plugs with high-voltage wires.
P0171 The car’s microprocessor module has registered an over-lean air-fuel mixture in the cylinders of the power unit.

Error P0171 (0171) leads to the following consequences:

  • overheating of the machine’s power unit;
  • burnout of piston rings, valves and pistons themselves;
  • rapid wear of the muffler;
  • reduction in engine power and traction while driving;
  • increased consumption of motor fluid and antifreeze.
P0172 Error code P0172 indicates that the air-fuel mixture is over-rich. When checking a malfunction, the engine must be started, and the electronic module must receive messages from all necessary sensors. Fuel is also supplied with feedback from the oxygen regulator.

Reasons why this error appears:

  • clogging of the mass air flow sensor, which leads to an increase in the supply of fuel;
  • malfunction of the fuel injector, which “overflows” fuel;
  • malfunction of the lambda probe or lack of signal from the sensor;
  • malfunction of the fuel pressure controller located in the fuel line;
  • damage to the intake or exhaust manifold, which led to air leaks;
  • malfunctions of the cooling system, including a faulty temperature controller or a thermostat stuck in one position;
  • Wear or carbon deposits on the spark plugs.
P0222 Malfunction of the throttle valve control drive unit. The problem may be a breakdown of the mechanism’s electric motor or its poor contact with the vehicle’s electrical network. It is necessary to test the wiring and connection quality; the cause of the malfunction may be a short circuit in the windings of the electric motor itself.
P0301 Code P0301 (0301) on cars of 2013 and other model years appears when misfires are registered in the first cylinder of the power unit. To eliminate the cause, it is necessary to test all elements of the ignition system, including the distribution unit and spark plugs. Coils and wires connected to the spark plugs are also subject to diagnostics.
P0302 With error P0302, the on-board computer (BC) states that a misfire has occurred in the second cylinder of the power unit.
P0303 Code P0303 is recorded by the microprocessor module if misfire occurs in the third cylinder of the engine, the problem is accompanied by the following “symptoms”:

  • unstable engine starting and inability to start if a large number of additional devices are activated;
  • the power unit “troubles” when idling, which leads to trembling of the vehicle body;
  • there is a lack of power from the power unit while driving;
  • fuel consumption has increased.

The appearance of code 0303 is preceded by the following problems:

  1. Poor spark formation on the spark plugs. The problem may be the formation of carbon deposits on these elements or an incorrectly set gap on the device. You should also check the armored wires connected to the spark plugs.
  2. Reduced compression level in the cylinders. To fix this problem, the user will need to decarbonize the power unit.
  3. Failure of the ignition system switchgear or the appearance of cracks on its cover. It will not be possible to eliminate defects, since they will lead to moisture getting inside.
  4. Poorly formed air-fuel mixture. It is recommended to change gas station.
  5. Low fuel pressure as a result of problems with the functioning of the fuel pump.
  6. Fuel injectors malfunction.
P0304 Code P0304 is also a problem associated with misfires, only now in the fourth cylinder of the engine
P0341 Malfunction P0 341 (0341) is related to the operation of the camshaft. The user needs to test the operation of the controllers, as well as the wiring and quality of the contacts. The problem may be that the marks on the shaft are out of sync.
P0342 Combination designation P0342 (0342) with interpretation – malfunction of the camshaft. There is no signal coming from the sensor installed on the engine. If the error appears after installing the controller, then the user needs to check the so-called target located on the pulley, as well as the gap between it and the regulator. If everything is in order, then the terminals and their condition are diagnosed for deformation, as well as the wiring.
P0352 Code P0352 appears when the second and third ignition coils or their electrical lines are faulty. The problem may be related to the operation of the power unit, which is not cooled sufficiently. In this case, the device is diagnosed and replaced in case of breakdown, as well as the contact is checked.

List of symptoms that appear when the ignition coil is faulty:

  • device overheating;
  • unstable functioning of the ignition system as a whole;
  • reduction in engine performance;
  • the appearance of the Check icon on the instrument cluster;
  • tripping of the power unit, in particular during operation at low temperatures;
  • the appearance of dips when operating at certain speeds;
  • inability to start the power unit.
P0366 Combination P0366 appears when the signal level coming from the camshaft controller is incorrect. The malfunction may be related not only to the sensor or wiring, but also to the control unit. You also need to check the shaft for wear – sometimes the problem manifests itself as a result of a broken tooth.
P0420 Combination P0 420 (0420) is associated with malfunctions of the catalytic converters. It is necessary to check the assembly for integrity and absence of defects. The problem may also be a malfunction of the engine control unit or oxygen regulators.
P0422 The microprocessor device registered malfunctions in the operation of the catalytic converter; the efficiency of the unit is critically low. If the problem P0 422 (0422) does not disappear after repair, you will need to completely remove the catalyst or reflash the control unit to the Euro-3 standard. You can also try installing a so-called decoy instead of lambda probe No. 2. If a catalytic converter breaks down, it usually cannot be repaired.
P0507 Code 0507 indicates increased speed of the power unit, which does not correspond to the standardized values.

The problem may occur for the following reasons:

  • clogged or malfunctioning throttle valve;
  • clogging of the idle channel;
  • malfunction of the controller for maintaining warm-up speed;
  • failure of the servomotor for forced increase in idle speed.
P0597 Code P0597 can have two error interpretations, but both of them are related to the operation of the thermostat:

  • damage to the electrical control circuit of the heating element of the thermostat of the engine cooling system;
  • The thermostat refrigerant control valve is stuck in the open or closed positions.

Regardless of the value of the error, the problem is accompanied by difficulties in engine operation, including insufficient heating or overheating of the power plant, as well as a decrease in traction and power.
P0598 Incorrect engine temperature signal sent to the vehicle control module. Most likely, the cause of the problem is a malfunction of the thermostat heating element control system. If the problem is in the wiring, then you need to test the cable for grounding to ground and the quality of contact of the device with the electrical network. The problem could also be with the heating element itself or the thermostat relay. If the device is stuck in the closed position, the cooling of the power unit will be insufficient, which will lead to overheating of the motor.
P2096 Error P2096 appears when the air-fuel mixture in the power unit is lean. Data to the control unit comes from oxygen controllers located after the car’s catalyst. The error indicates an excess of oxygen in the combustible mixture and a lack of fuel, so engine performance deteriorates, including jumps in idle speed and misfires, as well as decreased dynamics.

Possible causes of the problem that will allow you to clear the error and fix the problem:

  • the appearance of cracks in the exhaust manifold;
  • damage to gaskets and sealing elements of the unit;
  • clogging or failure of fuel injectors;
  • malfunction of fuel pumps;
  • clogging of one or more filters;
  • failure of the fuel pressure sensor.
P2104 Malfunction in the throttle control unit. The cause of the problem must be sought in the electric motor of the mechanism, since most likely the device has failed or its contacts have closed. You also need to test the wiring of the node.
P2135 Code P2135 indicates a discrepancy between the readings coming from the first and second throttle position controllers.

If the problem really occurs and it is not accidental, it is manifested by the following signs:

  • a serious drop in traction; when you press the gas, the car practically does not react;
  • when the power unit is idling, the speed jumps;
  • the engine cannot reach more than two thousand revolutions per minute even when the gas pedal is pressed all the way;
  • starting the engine is difficult;
  • after starting the power unit, the engine may stop immediately.

If this problem is not related to the operation of the sensor or control unit, then the following steps are performed to eliminate the cause:

  1. First, the user needs to make sure that there are no quality problems with the ground contact of the car’s control module.
  2. Then you need to make sure that the electrical outputs of the controllers provide the desired connection. To improve the connection quality, the user can bend the contacts on the block.
  3. It is necessary to diagnose the operation of the main relay. If necessary, the device is replaced.
  4. You should also diagnose the electromechanical throttle for possible problems. The faulty unit must be replaced.
P2138 Code P2138 on Aveo F14D3 and other versions indicates errors in the correlation of gas pedal position sensors 1-2. It is necessary to test the wiring and contacts on the controllers
P2187 Literally, the combination P2187 or 2187 stands for “low voltage in the fuel supply control system at idle speed.” You need to make sure that there are no misfires, and also check all the elements that affect the formation of the air-fuel mixture.
P2188 With errors P2188 or 2188, the engine control unit reports an over-enrichment of the air-fuel mixture in the cylinders of the power unit; codes appear with the following problems:

  • clogging of the air filter, which led to an over-enrichment of the mixture at idle speed of the engine;
  • malfunction of the idle speed sensor or its contamination;
  • clogged idle speed valve;
  • throttle valve contamination;
  • malfunction of the oxygen controller;
  • incorrect operation of the mass air flow sensor;
  • injector malfunction.
Code

Sensor malfunctions
P0037 Error codes P0037 or 0037 appear when there is a malfunction in the heating element of the oxygen sensor. You need to check the wiring and the device itself.
P0102 Code 0102 is a consequence of a low signal coming from the mass air flow position controller. The pulse supplied to the module from the flow meter does not correspond to the standardized parameters and may cause incorrect formation of the air-fuel mixture.
P0107 Code P0107 appears when the manifold pressure sensor is faulty; the error may be due to an inappropriate signal coming from the device. The problem is detected when the mains voltage is in the range from 11 to 11.5 Volts and the absolute pressure in the manifold is less than 12 kPa.
P0108 Code P0108 appears when there is a problem with the absolute pressure controller located in the intake manifold. The control unit notes that the signal from the device is too high and does not correspond to the normalized parameters.

In addition to reasons related to the wiring and the sensor itself, the following problems can be identified:

  1. Violation of the sealing of the pipes. The hoses that go to the sensor must be checked for integrity and absence of depressurization. The pipes may be damaged due to wear or external mechanical influences.
  2. Controller clogged. Dust, debris and deposits, as well as lubricants, may have gotten inside the regulator.
P0113 Error P0113 is associated with a malfunction in the intake manifold temperature controller. A critically high signal is received from the device to the vehicle control module.
P0122 Code P0122 is a consequence of a breakdown of the throttle position sensor. The control unit may receive a signal from the regulator that does not correspond to the normalized parameters. With this problem, the power unit may suddenly stop, for example, at traffic lights or in traffic jams.
P0223 Error code P0223 appears when the throttle mechanism is not operating correctly. The problem is a malfunction of the regulator drive device or a critically high signal coming from the sensor.
P0328 Code 0328 is associated with a malfunction of the knock controller. The control unit reports no signal or too high a pulse coming from the controller. It is necessary to check the wiring and integrity of the contacts on the connector, as well as the absence of damage to the insulating layer of the cable.
P0335 With error P0335 (0335), the microprocessor module reports problems in the operation of the crankshaft position controller; if it breaks down, the following problems are observed:

  • a drop in the power of the power unit, a decrease in the level of dynamics of the vehicle when driving;
  • sudden jumps in speed while driving;
  • difficulty starting the engine both cold and hot;
  • the appearance of detonation while driving, in particular when the engine is running under load.
P0343 With error 0343, the engine control unit reports that the signal coming from the camshaft sensor is too high. It is necessary to test the controller itself and its wiring.
P0365 Malfunction of the exhaust camshaft controller. The user needs to test the operation of the device and also check its wiring. Although the error indicates a broken power line, the cause may be a broken tooth on the shaft.
P0500 Vehicle speed sensor malfunction. If error 0500 occurs, you need to test the integrity of the wiring and the operation of the device itself.
P0509 Code 0509 is associated with a malfunction of the idle speed sensor. It is necessary to test the wiring and the element itself responsible for running the engine.
P0521 Malfunction of the engine fluid pressure controller. If errors occur in the operation of this device, the Check indicator and oil can light up on the instrument cluster. It is necessary to check the level of motor fluid in the engine and make sure that it corresponds to the norm; if necessary, add oil.
P0833 Error code 0833 indicates a malfunction in the limit switch located on the vehicle’s clutch pedal. The problem may be poor contact as a result of the device becoming clogged with dirt and dust. A detailed check and cleaning of the chip socket is required. The damaged limit switch is replaced with a new one.
P1382 This code indicates an incorrect signal coming from the rough road controller. The device may not work correctly or be damaged. The user needs to test the operation of the sensor, and also make sure that the voltage and resistance on the contacts are correct.
P2106 Error code P2106 appears when the throttle position sensor or electronic gas pedal malfunctions. You need to check the contacts on both devices. Failures in their operation will lead to a decrease in dynamics when the car is moving, as well as a lack of response of the vehicle to pressing the gas.
P2119 Error P2119 (2119) is the operation of the idle speed sensor. The problem may be accompanied by a decrease in engine power, as well as a deterioration in the dynamics of the vehicle as a whole.
U0415 The engine control module receives incorrect data from the ABS sensor or the anti-lock braking system control unit. When such an error appears, first of all you need to check the LAN electrical circuits in the cable harness between the motor control unit and the EVCM for increased resistance, as well as the reliability of the connections in the device blocks.
Code

Oxygen sensor errors
P0030 This code indicates a malfunction in the electrical circuit connected to the heating element of the first lambda probe. First, the user needs to diagnose the electrical control line of the heating component for increased resistance. If the operating parameter is higher than normal, the car owner performs a voltage diagnosis.
P0130 Error 0130 appears when there is a malfunction in the oxygen controller 1, installed upstream of the converter. The control unit detects an incorrect signal coming from the device. It is necessary to diagnose the wiring and contact elements of the sensor.
P0131 Error P0131 (0131) is detected when the voltage is critically low, recorded on the control line of the first lambda probe located before the converter. The problem may be reduced oxygen transfer to form the air-fuel mixture.
P0132 Combination P0132 indicates high voltage detected in the first oxygen controller circuit located in bank 1 of the engine.

Possible causes of the malfunction:

  • high combustion temperature of fuel;
  • short circuit in the line of the regulator heating device;
  • The power cable is damaged or the connector is disconnected from the device.
P0133 Combination P0133 or 0133 literally stands for “insufficient performance in the electrical circuit of the front lambda probe.” This indicates that the response coming from the regulator is too slow.

Reasons that could lead to this problem:

  • violation of the sealing of the exhaust or intake manifold, air leaks are not allowed;
  • problems in the operation of the fuel component;
  • Malfunction of the control circuits or oxygen sensor.

Recommendations to resolve the problem:

  • replacing the lambda probe with a new one;
  • reflashing the engine control unit with software disabling the controllers;
  • replacing the damaged intake manifold with a new one;
  • cleaning and flushing fuel injectors;
  • replacing the crankshaft position controller;
  • use of high-quality fuel;
  • reconfiguration of the gearbox for vehicles equipped with a gas cylinder installation.
P0134 Error P0134 (0134) is associated with damage to the power cable of oxygen sensor 1, installed before the neutralizer device. The control unit reports a wire break, so the integrity of the cable is tested first.
P0136 Code P0136 is the result of a short circuit to ground in the electrical circuit of the second oxygen regulator
P0137 Code P0137 appears when it is impossible to determine the presence of an oxygen sensor. The device does not send a signal to the control unit, so the problem may be related not only to the controller, but also to the wiring. A sensor malfunction will lead to incorrect formation of the air-fuel mixture, which can lead to incorrect engine operation. You should also check the sensor heating element for functionality.
P0140 Literally, this code is translated as “lack of activity from the second lambda probe”; diagnostics are performed as follows:

  1. The car’s ignition is turned off, then the engine starts and warms up. If error P0140 occurs, then the signal level should be in the region of 440-470 mV.
  2. The ignition is turned off, the contact elements are disconnected from the oxygen regulator. Then terminal outputs A and C must be connected to ground. The ignition is activated and the voltage is again checked by the scanner. The operating parameter should be less than 150 mV when the sensor fails.
P0141 Combination P0141 (0141) is a consequence of a malfunction in the electrical line of the heating element of lambda probe 2 installed in the first bank of the engine. With such an error, the Check indicator on the dashboard is sure to light up, and the fuel consumption of the car also increases.

Reasons why the problem could occur:

  • malfunction of the sensor heating element;
  • failure of the safety device responsible for the operation of the lambda probe;
  • damage to the power line or short circuit on the wire connected to the regulator;
  • heater circuit block malfunction;
  • malfunctions of the control unit, including software malfunctions;
  • If the problem appears after installing a new sensor, then it is possible that a device that does not meet the technical standards of the vehicle is being used.
P2196 Code P2196 (2196) is associated with an incorrect signal coming from the oxygen controller. The pulse from the sensor is not within the acceptable range. The problem can lead to the formation of an over-rich mixture in the cylinders of the power unit.
Code

Wiring faults
B1006 (9006) The control unit has detected an overcurrent when the turning lights are activated. Most likely, the increased signal is associated with a short circuit in the turn signal power line. The error may be due to a malfunction of the safety device, relay, or short circuit of their contacts.
B0012 Damage to the electrical circuit or incorrect signal on the airbag line installed in the steering wheel
B0015 The error indicates a malfunction in the electrical circuit of the seat belt retractor pretensioner. The device located on the driver’s side is subject to diagnostics.

Possible causes of the problem:

  • short circuit on the line to battery voltage;
  • short circuit of the wire to ground;
  • a break detected in the activation circuit of the strap winder pretensioner;
  • the resistance level is too high or low and does not correspond to the standardized indicators.
B3883 The problem is related to the control and power supply line of the rear license plate lamp, possible causes:

  • short circuit of the wire to battery voltage;
  • shorting the contact elements to ground;
  • Broken cable for license plate light indicator.
C0035 This error code indicates a fault in the power line of the speed controller installed on the front left wheel. A detailed check of the electrical circuit for damage or breakage is required. If this error appears along with other ABS fault codes, then the module itself, as well as the system sensors, must be tested.
C0040 Code C0040 indicates a malfunction of the anti-lock braking system.

To resolve the problem, you need to check the following items:

  1. Harness of wires connected to the ABS sensors located on the wheels. To gain access to the connector, you will have to remove part of the trim and possibly the vehicle bumper.
  2. Check the integrity of the sensors and the presence of signals coming from the devices. The controller itself may fail. Sometimes the problem is a faulty connector or broken contacts.
  3. Perform ground contact diagnostics. The grounding bolt may be located in the area of ​​the fuse box. It is necessary to check all the wires coming from the sensors and the control module of the anti-lock braking system. Often the contact oxidizes, which leads to a deterioration in signal transmission.
  4. Check the operation of the ABS control unit.
C0041 Malfunction or damage to the power line of the speed controller installed on the front right wheel
C0050 A break or low voltage detected on the control and power lines of the vehicle speed controller. If the sensor and its wiring are intact, the user needs to check the operation of the engine control unit.
C0277 Failures related to the wiring connected to the brake controller.

Possible causes of the problem:

  • low voltage or break in the cable connected to the device;
  • too high pulse level in the electrical circuit;
  • the control unit has not performed calibration in the electrical circuit of the brake pedal position controller;
  • frequent state transitions in the pedal controller electrical circuit;
  • under or overvoltage recorded at pin 3 of the reference voltage line of the control unit.
C1555 Malfunction of the power steering motor relay line. The user needs to diagnose the motor itself, the controllers, and the electric power steering control module. If error C1555 occurs, you need to check the contacts on the connection connector and make sure there is no oxidation in the block.
P0036 Error code 0036 is associated with a malfunction in the electrical circuit of the oxygen sensor heating element. The control unit reports errors in the operation of controller 2; the corresponding device and its electrical circuit must be checked and replaced in the event of a defect.
P0118 A critically high signal is supplied to the microprocessor module from the refrigerant temperature controller. If the sensor is faulty, it can cause engine problems, including overheating of the coolant. If the pulse is too high, this may indicate an incorrect resistance level, which is associated with a short circuit in the line.
P0138 If, when reading malfunctions, this code lights up on the instrument panel, this indicates increased voltage on the wire of the second oxygen regulator installed in the first bank of the engine. A high signal is recorded on the line for more than 10 seconds, which indicates a lack of oxygen in the exhaust gases. If the lambda probe itself and the wires are intact, then the user needs to check the operation of the engine control unit.

Diagnosis of problem P0138 (0138):

  1. Fault codes are read and then deleted from the control unit’s memory. A check ride is being carried out.
  2. On a car with the engine running, the lambda probe output data is diagnosed.
  3. The wiring of the regulator, as well as its pads, are checked for corrosion or breaks. You should also check the controller for physical defects in the housing or liquid contamination.
  4. Damage is diagnosed in the exhaust system in front of the lambda probe.
P0277 A break or short circuit in the power line connected to the injector installed in the sixth cylinder of the engine. It is necessary to check the quality of the connection and the operation of the device itself.
P0317 There is no input signal from rough road detection mechanisms and systems. The code is fixed if the engine management system cannot calculate the source of the rough road or the operating time of the electric motor is more than 10 seconds. The malfunction indicator may not appear on the instrument panel.

Diagnosis of the problem is carried out as follows:

  1. Clear error codes and check the control unit for problems again.
  2. If the car does not have an anti-lock braking system, then you need to disconnect the rough road sensor connector and the block from the engine control unit. Using the tester, the resistance level between output B of the vertical acceleration regulator and pin M21 of the microprocessor module is diagnosed.
  3. If the resistance does not correspond to the standardized values, it is necessary to eliminate the wiring break. After repair, the voltage level is measured at terminal B of the vertical acceleration controller.
  4. If the voltage is normal, the ignition is turned off and the sensor is changed. If the error remains after replacing the device, other fault codes must be eliminated, since they may be related.
P0327 Error code P0327 or 0327 on the Aveo T200 and other versions appears when the power line connected to the vehicle’s knock sensor is damaged. If there is a problem with the controller or there is no signal coming from it, fuel consumption increases, and extraneous sounds appear from under the hood. In addition, the density of smoke from the exhaust pipe becomes higher, and the dynamics of the vehicle as a whole decreases.
P0336 The crankshaft position controller signal is outside the acceptable parameters. The problem may be incorrect voltage or resistance on the control and power lines.
P0337 Combination P0337 (0337) appears when a short circuit is detected on the power line of the engine crankshaft position controller. It is necessary to test the wiring for possible damage or deterioration of the insulation.
P0338 Broken cable connected to the crankshaft sensor
P0351 Error code P0351 indicates a malfunction in the electrical circuit of the primary ignition coil. It is necessary to check the quality of contact between the line and the device, and also make sure that there are no short circuits or breaks on the wire. The problem may lie in the coil itself or the distribution module – distributor. Failures in the operation of the coils can occur in several cylinders at once.
P0340 Combinations P0340 and 0340 indicate a lack of communication with the engine knock sensor. A malfunction of the device or the inability to detect it by the control unit will lead to malfunctions of the power unit. The engine will begin to “trouble”, sounds uncharacteristic of its operation and a metallic knock will be heard from under the hood.
P0444 Short circuit to the power supply of the on-board network of the cable connected to the adsorber purge valve. The problem may also be a break in the control and power lines. To find the cause, you need to diagnose the device’s power circuit, as well as the voltage level at output B of the harness connector. Code 0444 is recorded by the Bosch on-board computer if the driver self-diagnosis has detected a short circuit at the circuit output.

The check is carried out as follows:

  1. The engine in the car turns off.
  2. The user disconnects the harness connector from the canister purge valve. The ignition is activated.
  3. Using a probe connected to ground, diagnostics of pin A on the connector is performed. If the tester indicator does not light up, this indicates a break in one of the cables.
  4. The multimeter is then connected between pin B and vehicle ground and the voltage is checked. If the operating value is less than 1 volt, this indicates a controller malfunction or a power line break. If the obtained parameter is from 4 to 6 volts, this indicates problems with the operation of the purge valve. If the operating value is more than 10 volts, the problem is that one of the cables is shorted to the battery.
P0500 Incorrect signal coming from the vehicle speed controller. The cause of the problem may be either the sensor or the wiring. You should also make sure that the contacts are intact and there is no damage to the cable connector connected to the sensor.
P0501 Lack of signal coming from the vehicle speed controller. The cause of the problem must be sought in the operation of the sensor itself or the electrical line. If the wiring is intact and installing a new controller did not solve the problem, then the reason may lie in the engine control unit.
P0502 The control module receives a critically low signal from the vehicle speed controller. The user needs to test the operation of the sensor and its wiring for wear. If these elements are intact, then the control unit must be diagnosed and replaced.
P0503 An intermittent signal is received from the vehicle speed controller. Most likely, the problem is either poor contact or wear of the insulating sheath of the conductor. In both cases, the contact will be unstable, as a result of which the signal arrives to the control module intermittently.
P0508 Code 0508 appears when the power supply wiring of the idle speed sensor is damaged. It is necessary to test the operation of the device and make sure that it has good contact with the vehicle’s electrical network.
P0510 Combination P0510 or 0510 is the result of a malfunction in the power line of the throttle position switch. If the mechanism does not work correctly, this can lead to improper functioning of the power unit.
P0599 With error P0599, the microprocessor module reports a critically high voltage on the line of the thermostat heating system. Most likely, the reason is the short circuit of the winding installed in the device. It is necessary to test and dial all contacts, and also make sure that the resistance is correct.
P0650 The vehicle’s on-board computer detected a critically low voltage signal in the power supply circuit of the fault lamp. If the problem is not in the indicator itself, then you need to look for it in the wiring or control unit. It is necessary to check the cables connected to the instrument cluster.
P0656 The OBD combination P0656 is associated with problems in the operation of the output pulse line recorded on the fuel sensor. The controller may transmit incorrect readings to the car’s instrument cluster. It is necessary to test the electrical circuit for a possible short to battery, ground or open circuit.
P0661 Code P0661 (0661) appears when the control line for the intake manifold flap drive solenoid is broken.
P0703 Code P0703 indicates a damaged power line or a poor-quality signal coming from controller B to reduce wheel torque. It is necessary to check the integrity of the wiring and the quality of the contacts.
P1101 Malfunction or open circuit of the atmospheric pressure sensor. The signal coming from the mass air flow controller is out of the permissible operating range. It is necessary to clean the valve, and also check the integrity of the wiring and the quality of the connection of the device.
P1115 Code 1115 on the Bosch 757 and other versions of on-board computers indicates a malfunction of the heating element of the oxygen regulator. It is necessary to test the wiring and contacts on the heater, as well as the device connection connector.
P1386 The control unit reports that the test signal or the controller’s knock channel integrator does not meet the standard parameters
P1410 Malfunction of the canister purge control valve, the control unit reports a short circuit in the line to ground
P1502 Short circuit to battery in the fuel pump relay control circuit
P1509 The microprocessor device has detected an overload of the idle speed sensor control line
P1513 Short circuit to ground in the idle speed sensor control circuit
P1514 Code 1514 appears when the wiring is damaged or there is a short circuit to the power source (battery) of the cable connected to the idle speed sensor. The problem could also be a broken wiring. Using a multimeter, you can test the cables connected to the idle speed sensor.
P1602 Combination P1602 (1602) is a consequence of a voltage loss in the vehicle’s electrical network. The user needs to diagnose the battery and make sure that the required voltage level is present at its terminals. With the engine turned off, the operating value, measured with a multimeter, should be about 12.7 Volts. If the power unit is started, this parameter should be in the range from 13.5 to 14 V.

The following components are also subject to diagnosis:

  1. Generator set. You need to make sure that the device is connected well, that there are no damage to the cables or inoperative elements (regulator relays, brushes, etc.).
  2. The engine control unit. A contact may have come loose from the device, resulting in voltage surges or code errors;
  3. Mounting module with fuses. The quality of the device connection, the absence of damaged contacts and the integrity of the sockets;
  4. Wiring in the car.
  5. Safety elements and relays located outside the mounting block.
P1661 Failure or lack of signal from the Check Engine indicator. It is necessary to check the operation of the light bulb located on the instrument cluster. The cause of the problem is often poor contact or oxidation of the connector; you need to check the wiring. If the indicator light itself is operational, then you just need to reset the error code.
P2088 Code P2088 indicates a malfunction in the intake camshaft variable valve timing drive solenoid control line. The problem is recorded in the first row and is a critically low voltage on the line. The problem may be a malfunction of the valve itself.
P2101 This error occurs as a result of malfunctions in the electrical line of the charging system drive unit at idle speed. The malfunction may be due to a break in the wiring or a short circuit in the line. If the wiring is ok, the user needs to test the operation of the battery and safety devices with relays. The latter can cause a short circuit, in particular, if there are malfunctions in the operation of the mounting block.
P2118 Mechanical or electrical failure of the charge drive device
Code

Malfunctions of electronic modules and digital communication buses
C0561 Error C0561 literally translates as “information about system shutdown has been saved – invalid data has been received.” The handbrake control unit must be fully diagnosed, since this unit receives an incorrect impulse or does not receive signals from other devices.
P0513 The vehicle control module has detected an incorrect engine immobilizer key. If the immobilizer does not recognize the control element, you can try to start the power unit using an additional electronic transponder.
P0560 If diagnostics using the on-board computer helped to read and recognize code 0560, this means that the voltage in the electrical network is below the minimum value.

Possible causes of the problem:

  1. Short circuit in one of the sections of the vehicle’s on-board network. It is necessary to call the wiring and test the integrity of all power lines for insulation defects.
  2. Battery malfunction due to wear and tear. It is necessary to check the electrolyte level in the battery banks and replenish it if necessary.
  3. Battery discharge due to low temperatures or multiple engine attempts. The device needs to be recharged. The problem may lie in the power unit itself – if the unit is faulty, there is no point in turning the engine to start it.
  4. Reduced battery capacity. Charging the device will not help; it will need to be replaced.
  5. Malfunction in the engine control unit.
  6. Malfunction of the generating set or one of its structural components. The user needs to check the voltage regulator relay, as well as the drive belt and pulley. The strap could be worn out, which leads to voltage drops.
P0606 Code P0606 (0606) indicates the speed of the controller. This problem relates to malfunctions in the microprocessor module. It is necessary to test the integrity of the wiring and make sure there are no software problems.
P0693 Code 0693 indicates a malfunction of the electric fan 2 of the cooling system. The user needs to check the operation of the device’s electric motor, as well as the quality of the contacts and their integrity on the connector. One of the safety elements or relays may fail.
P1396 Code P1396 or 1396 appears as a result of problems recorded in the operation of the anti-lock braking system (ABS).

Possible reasons that may precede the appearance of this combination:

  • malfunction of ABS sensors located on the wheels; the problem may be oxidation of the contacts on the devices;
  • damage or wear to the wiring, lack of signals from one of the system components;
  • malfunction of the ABS control module, software failure of the board;
  • incorrect operation or lack of signals from rough road sensors.
P1570 Error code 1570 indicates an incorrect signal coming from the vehicle’s standard anti-theft system, APS. The problem must be looked for in the immobilizer control unit or poor-quality contact. The reason may also be a malfunction of the antenna module.
P1628 Code 1628 indicates a lack of communication with the immobilizer. The problem may be a malfunction of the immo control unit or incorrect operation of the engine control module. In the second case, software failures may occur. You need to make sure that the wiring is intact, as well as the functionality of the electronic key.
P1629 On Aveo T300 and other versions, code 1629 is associated with incorrect calculation of the vehicle immobilizer. This indicates that the microprocessor module cannot detect the presence of an engine blocker or a conflict has arisen between these two devices during operation. There may also be problems in determining the electronic key of the transponder.
P1640 The microprocessor reports an error in reading or writing information from the internal flash RAM of the control unit. The problem may be software in nature.
P1689 Incorrect code parameters in the fault memory of the control unit
U0073 Damage or disconnection of the digital bus connected to the LS electronic controller. It is necessary to check the wiring and contact elements on the connector.
U0100 Error in communication between engine control units and gearbox via CAN bus. The user needs to test the operation of the wiring and digital interface. The occurrence of an error may be due to voltage surges.
U0401 Incorrect data received by the microprocessor module from the ECM control unit. It is necessary to test the integrity of the wiring and cables, as well as the operation of the control module of the transmission unit.
Code

Transmission faults
B1018 (9018) Literally, this code stands for “resetting the electronic control unit.” This problem is not an error in the electronic engine management system, but rather a problem with the package in the local integration of the on-board computer. The problem is software in nature.
P080A The error code indicates that the clutch pedal position data is not being received. This problem may occur after replacing or repairing the transmission unit module or clutch sensor. With this problem, the engine may stall at idle, and dips are often felt (the car does not respond to gas). It is also possible for the power unit to stop arbitrarily when changing gears. To adapt the device, you will need a firmware change or a special scanner.
P0700 Codes P0700 and 0700 are the result of problems recorded in the operation of the transmission control unit or the speed control system. To find the problem, you need to diagnose the correct functioning of the brake switch (“frog”). The automatic transmission lever position controller is also subject to diagnosis, since this unit transmits signals to change gears. The error is typical only for automatic units.
P0711 The performance characteristics of the power line of the oil temperature controller in the transmission unit do not correspond to the standardized indicators. The problem may be with the sensor itself or its wiring. An error is detected if the temperature of the consumable in the transmission has changed by no more than five degrees within ten minutes from the moment the engine starts. If the sensor and its wiring are operational, it is recommended to check the quality of the fluid itself. If there are traces of deposits and sediment, the transmission oil is replaced.
P0751 The error refers to a malfunction of the transmission unit. The control unit reports that the first gear shift solenoid valve is malfunctioning. The device is stuck in the off position. With such an error, the gearbox control module blocks the first speed and also blocks idling in neutral.
P0752 The vehicle control unit indicates a malfunction in the first gear shift solenoid valve. It is noted that the device is jammed in the activated state. The gearbox control module detects the unit slipping at more than 400 rpm for 1.5 seconds when the third gear command is issued. An error is logged if the problem occurs five times in a row.

With such an error, the transmission unit may go into emergency mode, since the transmission control unit:

  • limits the operation of the device to the second range and reverse;
  • locks the option of switching speeds up and down using the TAP mechanism;
  • blocks the ability to manually switch speed modes;
  • does not allow idling in neutral gear;
  • “freezes” the operation of active options;
  • transmits a command to increase the pressure parameter in the pipeline to the maximum value.
P0796 Malfunction in the operation of the pressure control solenoid valve 3 in the gearbox. The problem is typical only for automatic transmissions and is accompanied by the unit going into emergency mode. With this error, the gearbox valve gets stuck in the off position, which leads to difficulties when shifting gears.
P0797 Same problem, except P0 797 means the transmission solenoid valve is stuck closed. The transmission unit control unit detects an incorrect gear ratio of the disengaged clutch or a decrease in speed when changing gears.
P0833 The error code indicates a malfunction in the automatic transmission device. The problem is a faulty clutch pedal position sensor. The control unit notes that the signal on the device’s power line is too low and does not correspond to the normalized data.
P2714 Malfunction in the control system of the solenoid valve D of the automatic transmission. The device is stuck in the closed position, which can lead to incorrect operation of the unit as a whole.
P2723 On Sherwolle vehicles, this fault code can have two meanings:

  • low voltage on the control and power line of solenoid E of the automatic transmission, you need to check the operation of the device and replace it;
  • malfunction of the solenoid valve for controlling the clutch pressure system 5 of the gearbox, the device is locked in the off state.
Code

Chevrolet Lanos self-diagnosis errors
1 Low signal level recorded by the control unit from the throttle position sensor. The pulse is outside the lower limit of the acceptable range.
2 The throttle position sensor signal is too high. You need to check the operation of the device and its contacts.

To fix the problem, you can adjust the controller:

  1. At the first stage, the corrugated line through which the air flow passes is disconnected from the device. It is washed using solvent, diesel fuel, alcohol or a special product. Similar actions are repeated with the damper and intake manifold device. Then all elements must be wiped with a soft cloth.
  2. Use a wrench to loosen the screws securing the damper position controller. The mechanism itself rises and sharply drops down until it stops, and a characteristic sound should be heard. The position of the fastening components is fixed with nuts.
  3. Then the bolted connections of the controller are unscrewed, and the device body is unfolded. The damper sensor is set in such a way that the voltage changes when the damper opens.
  4. All bolts are tightened with a wrench.
3 Reduced signal level detected on the line of the second cooling system fan. If the device does not work, this will lead to overheating of the power unit.
4 Critically high voltage on the circuit connected to the cooling fan 2
5 Low voltage level detected on the power line of the first ventilator of the cooling system. It is necessary to test the quality of contacts, wiring and integrity of connectors. Due to the aggressive environment in the engine compartment where the fan is located, the problem is often oxidation of the contact elements on the device connection block or their clogging. A detailed inspection and cleaning of the pad is required.
6 High voltage detected on the control and power line of the first cooling fan. The cause of the problem may be a faulty fuse element or relay, as well as the wiring itself. A detailed check and testing of the power lines connected to the fan is required.
7 Malfunction in the operation of the electromagnetic valve of the exhaust gas recirculation system. The user needs to clean the device and replace it in case of breakdown, as well as diagnose the control and power lines. The problem may be low voltage.
8 High signal level on the power line of the exhaust gas recirculation solenoid valve. The problem must be found in the wiring and contacts. If the electrical circuits are intact and there is no short circuit, then the reason may be in the motor control unit.
12 The power unit control unit reports the absence of errors and malfunctions in the operation of vehicle systems and components
13 Oxygen regulator malfunction. To find the cause of the problem, the heating elements of all sensors are diagnosed, since the controller number and its location are not indicated. The problem may lie in the device itself and its poor-quality contact.
14 Incorrect engine temperature signal sent to the vehicle control module. The cause of the problem is a malfunction of the thermostat heating element control system or the refrigerant temperature sensor. If the reason is wiring, then you need to test the cable for grounding to ground and the quality of contact of the device with the electrical network. The problem could also be with the heating element itself or the thermostat relay. If the device is stuck in the closed position, the cooling of the power unit will be insufficient, which will lead to overheating of the motor. If the signal from the temperature sensor increases, the contacts and connectors are checked.
15 A critically low signal is supplied to the control module from the refrigerant temperature controller. If the regulator fails, it can cause problems with the engine, including overheating of the coolant. If the pulse is too high, this may indicate an incorrect resistance level, which is associated with a short circuit in the line.
16 Malfunctions or lack of communication with the detonation controller. The control unit reports no signal or too high a pulse coming from the controller. It is necessary to check the wiring and integrity of the contacts on the connector, as well as the absence of damage to the insulating layer of the cable.
17 A malfunction in the operation of the injector associated with a short circuit of the power supply circuit to ground.

If the problem is not random and the device control line, then it is accompanied by the following symptoms:

  • difficult starting of the engine, inability to start the power unit;
  • malfunctions in the functioning of the power unit at idle or during transition mode;
  • failures when pressing the gas pedal, lack of engine response;
  • decrease in engine power level and deterioration in dynamics during acceleration;
  • increased fuel consumption;
  • increased toxicity of exhaust gases;
  • the appearance of detonation when accelerating a car, associated with an increase in temperature in the combustion chambers;
  • misfire of the combustible mixture;
  • popping noises coming from the exhaust system;
  • malfunction of the oxygen regulator;
  • breakdown of the catalytic converter.

To fix the problem, you need to check the quality of the connection and flush the elements.
18 The vehicle’s knock sensor is faulty or the device is receiving an incorrect signal. You need to check the wiring and connector.
19 The car’s microprocessor unit detects an incorrect pulse coming from the crankshaft position regulator
21 High voltage on the throttle position controller control line. The problem may be a breakdown of the mechanism’s electric motor or its poor contact with the vehicle’s electrical network. It is necessary to test the wiring and connection quality; the cause of the malfunction may be a short circuit in the windings of the electric motor itself.

If this problem is not related to the operation of the sensor or control unit, then the following steps are performed to eliminate the cause:

  1. First, the user needs to make sure that there are no quality problems with the ground contact of the car’s control module.
  2. Then you need to make sure that the electrical outputs of the controllers provide the desired connection. To improve the connection quality, the user can bend the contacts on the block.
  3. It is necessary to diagnose the operation of the main relay. If necessary, the device is replaced.
  4. You should also diagnose the electromechanical throttle for possible problems. The faulty unit must be replaced.
22 Low pulse detected on the throttle sensor power line.

If the problem really occurs and it is not accidental, it is manifested by the following signs:

  • a serious drop in traction; when you press the gas, the car practically does not react;
  • when the power unit is idling, the speed jumps;
  • the engine cannot reach more than two thousand revolutions per minute even when the gas pedal is pressed all the way;
  • starting the engine is difficult;
  • after starting the power unit, the engine may stop immediately.
23 The signal from the intake air temperature controller is too high or the operating parameter is too high
24 Vehicle speed controller malfunction. To determine the cause, you need to test the sensor itself, and then diagnose the circuit connected to the regulator.
25 Incorrect data received by the microprocessor module from the intake air temperature controller
27 Malfunctions of the air conditioning system. The error indicates problems in the operation of the sensor, in particular, an increased signal coming from it. If the controller itself is working, then to find the cause, it is recommended to check the operation of the compressor device of the air conditioning system.
29 Malfunction of the fuel pump relay. With such an error, it may be difficult to start the engine, up to the impossibility of starting the power unit. The reason may be welding or burnout of the contact elements on the relay. If this device is operational, then it is necessary to test the safety elements.
32 Malfunction in the exhaust gas recirculation system. The problem may be a problem with the EGR valve. If the latter breaks down, the idle speed of the power unit is unstable, fuel consumption increases, and black smoke comes out of the muffler.

The main reasons that can lead to blocking of the exhaust gas recirculation system valve:

  • damage due to wear of valve stem seals;
  • boosting the engine;
  • lubricant entering the exhaust system;
  • regular use of low-quality fuel;
  • failure of the system valve as a result of natural wear;
  • increasing the volume of motor fluid in the engine;
  • violation of the established operating mode of the exhaust gas system.

If the malfunction is not related to the valve, then you need to visually inspect all lines and pipes of the exhaust gas recirculation system for integrity.
33 Problems related to the operation of the absolute pressure regulator located in the intake manifold. The control module reports that the controller is supplying a critically high voltage that does not correspond to the factory values.

In addition to reasons related to the wiring and the sensor itself, the following problems can be identified:

  1. Violation of the sealing of highways. The hoses that go to the sensor must be checked for integrity and absence of depressurization. Hoses can be damaged due to wear or external mechanical influences.
  2. Controller clogged. Dust, debris and deposits, as well as lubricants, may have gotten inside the regulator.
34 A similar problem associated with the operation of the absolute pressure sensor in the intake manifold. In this case, the cause of the malfunction indicates low pressure in the system.
35 Idle speed control valve is faulty
36 General error about the operation of the exhaust gas recirculation system. It is necessary to test the operation of all sensors, as well as the wiring connected to them. If these elements are intact, then the system mains are subject to diagnostics for integrity and absence of leaks. The problem may be loose clamps.
41 Increased voltage detected in the operation of the control module by ignition system B. It is necessary to check the vehicle’s electrical network for the absence of load surges. For this purpose, the battery and generator device are tested.
42 Malfunction in the operation of control module B of the ignition system. This device also emits a critically high signal.
44 Leaning of the air-fuel mixture. This signal was received by the control unit from the oxygen controller.

Possible causes of the problem that will allow you to clear the fault code and fix the problem:

  • the presence of defects and cracks in the exhaust manifold;
  • wear of gaskets and sealing elements of the unit;
  • clogging or failure of fuel injectors;
  • malfunctions of fuel pumps;
  • clogging of one or more filters;
  • breakdown of the fuel pressure regulator.
45 The oxygen regulator reports that the air-fuel mixture is over-rich; this problem may be due to the following reasons:

  • a malfunction of the temperature sensor or a thermostat stuck in one position;
  • clogged mass air flow regulator;
  • malfunctions of the fuel injector, which “overflows” fuel;
  • lambda probe malfunction or lack of signal from the sensor;
  • malfunction of the fuel pressure controller located in the fuel line;
  • damage to the intake or exhaust manifold, which led to air leaks;
  • malfunctions of the cooling system, including a faulty
  • formation of carbon deposits on spark plugs or wear of these components, as well as damage to armored wires.
49 Increased supply voltage in the vehicle electrical network. If the battery and generator set are functional, then the cause should be sought in the engine control unit or mounting module with fuses and relays.
51 A general code indicating a memory error in the motor control unit. It is necessary to check the software component of the microprocessor. If the error affects the operation of the engine, gearbox or other units, it is recommended to reflash the device.
53 Malfunctions in the immobilizer, possible causes of the problem:

  • failure of the electronic key – transponder;
  • discharge of the battery installed in the control element;
  • disconnecting one of the contacts from the engine blocker control module;
  • failure of the immobilizer control unit;
  • malfunction or lack of communication with the antenna adapter;
  • serious electromagnetic interference that impedes data transmission associated with the use of powerful electronic equipment in the car;
  • conflict in the operation of the immobilizer and the non-standard anti-theft system.
54 A malfunction in the operation of the resistor element for adjusting the mixture composition, this problem is manifested by the following symptoms:

  • malfunction or failure of the flow meter;
  • malfunction or shutdown of the fuel injector, which “overflows” gasoline;
  • malfunction of oxygen regulators or lack of signals from the sensor;
  • malfunctions of fuel pressure sensors located in the fuel line;
  • damage to the intake or exhaust manifold, which led to air leaks;
  • malfunction of the cooling system, including a failed temperature sensor or a thermostat stuck in one position;
  • Wear or carbon deposits on the spark plugs.
55 General fault code of the powertrain control unit
61 Undervoltage detected on the vapor accumulator valve control line
62 Malfunction of the fuel vapor battery valve; a critically high signal is detected on the device’s power line
63 There is a problem with the operation of the control module of the ignition system B. The microprocessor module reports a low voltage detected on the line connected to the device.
64 Malfunction of the ignition system control unit A. The control module receives a critically high signal from the device.
87 Error in the operation of the relay of the compressor device of the air conditioning system or climate control. The microprocessor module reports a critically low voltage detected on the line.
88 Also an error related to the operation of the air conditioning compressor relay. The malfunction is caused by an increased voltage level.
93 Malfunctions in the operation of the electronic control module of the power unit
Code

Self-diagnosis errors
01 Malfunctions of the microprocessor device. The cause of the problem may be a disconnected connector or damaged contacts, as well as software problems. If the module connection is good, the problem should be looked for in the firmware itself.
02 The car’s on-board computer detected damage to the control line of the fuel level sensor in the gas tank. The problem may be shorted contacts or a faulty fuel pump.
04 A critically high voltage level recorded in the vehicle’s electrical network. The operating parameter is more than 16 volts, so the user must perform detailed diagnostics of the operation of the battery and generator.
08 The voltage level in the car’s electrical network is too low. To find the cause, you will also need to diagnose the battery and generator.
12 Malfunction in the operation of the diagnostic indicator light. The problem may lie in the indicator light itself or its wiring or contacts. Sometimes the error is associated with voltage surges caused by battery faults.
13 No signal coming to the microprocessor module from the oxygen controller
14 An impulse is sent to the vehicle’s control module indicating overheating of the antifreeze in the cooling system. This problem can cause the power unit to overheat.
15 The engine coolant temperature is not normal and is significantly below the permissible threshold
16 The vehicle’s electrical system has critically high voltage. The problem is usually a faulty battery. If its charge is too low, the generator must operate at a higher power to compensate for the discharge.
17 Reduced voltage level in the machine’s electrical network
19 Incorrect signal coming from the engine crankshaft position controller to the control unit
21 Malfunction of the throttle valve mechanism. The controller installed on the mechanism sends a critically high signal to the machine control unit.
22 Reduced pulse coming from the throttle position sensor
23 An increased signal that does not correspond to the norm is recorded on the power line of the intake air temperature controller
24 The speed sensor is faulty. The problem is that there is no signal coming from the device, so the reason may be damaged wiring or a disconnected contact. Also, sometimes the problem manifests itself as a result of a clogged pad.
25 Reduced signal recorded on the intake air temperature regulator power line
27, 28 Malfunctions related to the operation of the exhaust gas system potentiometer. The signal coming from the sensor is at a critically high or low level.
33 This code may indicate a malfunction of the mass air flow controller or absolute pressure regulator. Regardless of the error interpretation, the problem is an increased signal detected on the control and power lines of the sensor. It is necessary to check the wiring and also make sure that there are no voltage surges on the line. The problem may be poor contact.
34 A similar problem associated with the operation of absolute pressure or mass air flow sensors. In this case, the reason is a critically low signal recorded on the control and power lines.
35 The engine idle speed does not correspond to the standardized values. The problem may be a speed sensor or a malfunction of the control unit.
41 Incorrect pulse coming from the phase controller
42 Problems in the operation of the electrical control line of the electronic ignition system. Possible malfunction of the lock itself. Detailed diagnostics of wiring and contacts is required. If all components are intact. The user needs to make sure that the elements of the ignition system are working, including the operation of the control unit and switchgear.
43 Incorrect signal coming from the detonation controller
44 Error indicating a lean fuel mixture
45 An over-enrichment of the air-fuel mixture was detected in the cylinders of the power unit.
49 Problem associated with loss of vacuum; diagnostics of system elements is required for leaks
51 Error in the control unit’s read-only memory. The problem must be looked for in a software malfunction or firmware failure. The reason may also be poor contact between the module and the wiring.
52 Malfunction of the random access memory device. If the control unit is working, then the problem is in the wiring. Also, the reason may be prolonged exposure to moisture on the control module, which led to oxidation of the contacts and failure of the board.
53 No signal coming from the exhaust gas system controller. In Niva cars, this error indicates an increased voltage recorded on the line.
54 The control unit reports the absence of a signal coming from the octane corrector. It is necessary to diagnose the contacts and wiring of the sensor.
55 The microprocessor module registered a lean air-fuel mixture under increased load on the power unit. In Niva cars, this error indicates a malfunction in the operation of the engine control unit.
61 Malfunction of the lambda probe, literally this error indicates “degradation” of the controller
Code

Description of self-diagnosis errors Chevrolet Cobalt
15 Malfunction of the additional stop signal. It is necessary to test the wiring and performance of the light bulbs themselves. The fault may be in the safety device or relay.
16 Malfunction of brake signals. It is also necessary to check the lighting sources and contact elements on the chips connected to them.
18 Malfunction in the electrical circuit of the low beam headlight installed on the left. The problem may be damaged or shorted wiring due to cable wear.
19 Malfunction of the rear fog lamp. It is necessary to test the wiring and contacts. The problem may be with the relay or fuse element.
20 Damage to the circuit supplying the right low beam headlight
21 Malfunction of the power line for controlling the side lamp located in the left headlight
22 Damage to the power wire of the side lighting element in the right lighting device
23 Malfunction of the bulb installed in the reversing light
24 Damage to the control and power supply lines for the license plate light
25 Malfunction or failure of the light bulb installed in the left front turn signal
26 Malfunction of the left rear turning light. The problem must be looked for in the wiring or poor contact, as well as relays and safety elements.
27 Front right turn signal malfunction
28 Malfunction of the right rear turn signal
84 Reduced motor power. The problem may be problems related to the functioning of the powertrain control system. A detailed diagnosis of the car using a scanner or computer is required.
89 A code indicating the need for vehicle maintenance.
Trouble codes covered for the following Chevrolet models:
  • Aveo;
  • Captiva;
  • Cobalt;
  • Cruze;
  • Laccetti;
  • Niva;
  • Rezzo.

How to diagnose the error?

There are two ways to carry out diagnostics and obtain Chevrolet error codes – using a standard on-board computer and a diagnostic scanner (or a laptop with a program). The second option is more appropriate because it provides accurate information regarding the error and provides recommendations for resolving it.

Self-diagnosis is performed as follows:

  1. In a car, the driver presses the odometer button on the dashboard to reset the daily mileage.
  2. The key is inserted into the lock and turned to activate the ignition system. This will cause the needles on the speed sensors (speedometer), engine temperature and others to begin moving to the maximum position and back.
  3. The odometer button is pressed by the driver once. The control unit software version will appear on the on-board computer display. If you press the daily mileage key again, combinations of faults will begin to appear on the screen. If there are a lot of error codes, the display shows a number corresponding to the sum of these combinations. For example, fault 10 indicates codes 8 and 2, 6 – the sum of the numbers 2 and 4, etc.

To test systems using third-party equipment (computer or scanner), perform the following steps:

  1. The diagnostic connector is being prepared. The device can be located under the ashtray, behind the glove compartment, or in the center console, to the left of the steering wheel. The block can be covered with a special plastic protective cover, which must first be removed. If there are traces of dust on the connector, you need to clean it.
  2. The diagnostic device is connected to the block. If you are using a computer, you will need a special cable to connect to the connector and USB output.
  3. After connecting, the diagnostic utility starts on the computer. If a scanner is used, the device is turned on. Depending on the software, the utility can test all vehicle systems at once or only some of them. The user makes all the settings to choose from.
  4. The process of checking the components and mechanisms of the car is carried out. After testing is completed, you can view information about faults on the screen of a laptop or scanner. The received data must be decrypted to determine the cause of the problem, and then eliminate the error. If the repair was successful, error codes can be deleted from the memory of the vehicle control unit.

For Chevrolet Lanos cars, self-diagnosis is performed using the OBD connector and a jumper:

  1. The ignition system in the car is turned off.
  2. A jumper (a piece of wire clip) is inserted into the diagnostic output; the user needs to close the contact elements marked A and B.
  3. The ignition system is activated, but the engine does not need to be started. The canister purge valve, the air conditioning system clutch and the cooling system fan will be activated. The latter will operate at maximum speed. The idle speed sensor will move in different directions from 0 to 160 steps.
  4. The Check Engine light will begin to blink, indicating trouble codes in the vehicle’s operation. All flashes of the light bulb are separated by pauses, the duration of a short one is approximately 1 s, and a long one is about 2 s. The first is used to separate numbers in a combination, and the second is used to separate codes. For example, code 32 is indicated by three flashes of the indicator light, a short pause, then two more flickers and a long pause.
  5. It must be taken into account that each combination output by the engine control unit is output three times in a row, that is, code 32 will be displayed in the format 121212323232. 12 always indicates the beginning and end of issuing codes on Lanos. If there are no combinations other than number 12, this indicates that there are no errors in the operation of the control module.

How to reset the error?

There are several options for removing errors from the control module memory:

  1. Clearing the control unit of codes by disconnecting the battery. To do this, you need to open the engine compartment and simply loosen the terminal clamp at the battery output, and then disconnect it. Further connection is made after 1 minute.
  2. Shutdown using the standard on-board computer; this “device” is equipped with an additional function specifically for this purpose. The user needs to enter the main menu of the device, and then select the separate “Errors” section. After this, press the middle button on the instrument cluster, which will trigger a short-term sound signal. Dash marks should appear on the device screen; if they are present, we can conclude that the control unit’s memory has been successfully reset.
  3. To remove error codes, you can use a computer with a diagnostic program or a special scanner. The device has an additional function that will allow you to remove combinations of faults from the control unit’s memory.

There is a separate method for removing codes from the control module for Chevrolet Cruze cars:

  1. The vehicle’s power unit starts and warms up to operating temperature; it is advisable to use increased engine speeds.
  2. Then the positive terminal clamp is disconnected from the battery for 10-15 minutes. During this period, the vehicle’s electronic system must check all fault codes in the operation of the power unit and reboot.
  3. Then the battery is connected again. The key is inserted into the ignition and turned to activate the system. The dashboard should work.
  4. After these manipulations, after one minute the engine is restarted, the power unit should idle for about 15 minutes. During operation, the driver should not press the gas pedal. It is recommended to start the engine 2-3 times.
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