Chevrolet OBD Codes: Meaning & Fixes

P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low C0035 Chassis The ABS module lost a valid signal from the driver-side front wheel speed sensor. Moderate P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0299 Powertrain The turbo or supercharger isn't building the boost pressure the engine computer is asking for. Moderate P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0304 Powertrain Cylinder 4 is misfiring. Its end or rear position makes water, oil and intake leaks common… Moderate

B0012 Body Airbag firing-loop fault; location depends on the make: passenger dash airbag or, on GM… High B0013 Body Fault in the firing loop of the front passenger's knee airbag near the glovebox; GM uses… High B0022 Body Fault in the second firing loop of the left roof-rail curtain airbag; GM and others use B0022… High B0051 Body SAE: front middle seat buckle sensor fault. On GM vehicles: the airbag module has logged… High B0052 Body Usually a fault in the front passenger's buckle sensor; on GM vehicles it is a stored crash… Moderate B0057 Body SAE: third-row middle buckle sensor fault. GM: fault in the front passenger belt pretensioner… High B0074 Chevrolet · Body The pressure sensor mat inside the passenger seat cushion is giving bad or no readings. High B0081 Chevrolet · Body The airbag module reports a problem with the passenger presence module under the right front… High B1325 Chevrolet · Body A GM body module saw its supply voltage drop too low or rise too high, usually a battery issue. Low C0035 Chassis The ABS module lost a valid signal from the driver-side front wheel speed sensor. Moderate C0055 Chassis The ABS module lost the combined rear-axle speed signal used on many GM trucks, vans and SUVs. Moderate C0110 Chassis The GM brake module (EBCM) found a fault in the ABS pump motor circuit and switched ABS off. Moderate C0121 Chassis The GM brake module can't confirm power to the ABS solenoid valves through its valve relay. Moderate C0131 Chassis The GM brake module sees an implausible or out-of-range signal from the brake pressure sensor. Moderate C0265 Chevrolet · Chassis The ABS module on many GM trucks found its built-in relay isn't delivering power, so ABS shuts… Moderate C0545 Chevrolet · Chassis The electric power steering module can't trust its torque sensor, so steering assist may cut… High C0561 Chassis GM's brake or chassis module switched off stability/traction control because of a fault… Low P0008 Powertrain Camshaft timing on bank 1 has drifted from the crankshaft. Often a stretched timing chain. Moderate P0010 Powertrain The PCM found an electrical fault in the intake cam phaser solenoid circuit on bank 1, not… Low P0011 Powertrain The bank 1 intake cam sits further advanced than the PCM asked for, usually an oil or control… Moderate P0014 Powertrain The bank 1 exhaust cam won't follow its target and stays too far advanced; think oil, valve… Moderate P0015 Powertrain The bank 1 exhaust cam sits later than commanded; a stretched chain or stuck exhaust phaser… Moderate P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High P0017 Powertrain The bank 1 exhaust cam signal doesn't line up with the crankshaft; think chain, exhaust phaser… Moderate P0018 Powertrain The bank 2 intake cam is out of step with the crankshaft on a V or boxer engine; chain wear… High P0068 Powertrain The airflow the engine measures doesn't match what the throttle opening says it should be. Moderate P0102 Powertrain The MAF signal is too weak for the PCM to accept, so it treats the circuit as dead… Moderate P0150 Powertrain The upstream O2 sensor circuit on bank 2 is sending readings the ECU can't use, usually wiring… Low P0154 Powertrain Bank 2's front O2 sensor never started switching; the ECU sees only a flat voltage from it. Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate