OBD-II Trouble Codes: Meaning & Fixes

B0001 Body The airbag module found a fault in the firing circuit for the driver's front airbag (stage 1). High P0135 Powertrain The heater inside the upstream oxygen sensor on bank 1 isn't working or its circuit is faulty. Low P0174 Powertrain The cylinder bank without cylinder 1 is running lean even with the maximum fuel correction… Moderate P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0430 Powertrain The bank 2 converter on a V6, V8 or split-exhaust engine isn't cleaning the exhaust well enough. Low

B0001 Body The airbag module found a fault in the firing circuit for the driver's front airbag (stage 1). High B0002 Body The airbag module sees a fault in the second-stage firing loop of the driver's steering wheel… High B0004 Body Fault in the firing circuit of the driver's knee airbag in the lower dash below the steering… High B0010 Body The airbag module found a fault in the first-stage firing loop of the front passenger's… High 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 B0020 Body Fault in the firing loop of the left (driver-side) side airbag, usually the one in the driver's… High B0022 Body Fault in the second firing loop of the left roof-rail curtain airbag; GM and others use B0022… High B0028 Body Fault in the firing loop of the right (passenger-side) side airbag, usually in the passenger… High B0051 Body SAE: front middle seat buckle sensor fault. On GM vehicles: the airbag module has logged… High 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 B00A0 Body The front passenger seat sensing system has failed, so the car can't tell who, if anyone… High B0111 Toyota · Body The airbag computer sees a break in the firing circuit of the right front seat's side airbag. High B1018 Nissan · Body The airbag unit reports a passenger seat occupant sensor fault, so the passenger airbag may be… High B1346 Hyundai · Body The airbag computer measured too much resistance in the driver airbag circuit; it may not… High B1448 Hyundai · Body The sensor mat in the passenger seat cushion failed its self-test, so the passenger airbag… High B1764 Kia · Body Kia's passenger seat detection unit reports a broken sensor mat, so airbag suppression can't be… High B1801 Toyota · Body The airbag computer measured a break in the driver airbag's firing loop through the steering… High B1B02 Jeep · Body The airbag computer sees a break in the driver airbag's firing circuit, so it may not deploy… High B2278 Ford · Body The power steering module can't trust the column torque sensor, so it drops or limits steering… High C0021 Chassis The brake module thinks the power brake booster isn't giving the assist it should. Check pedal… High C0545 Chevrolet · Chassis The electric power steering module can't trust its torque sensor, so steering assist may cut… High C1252 Toyota · Chassis The brake pressure pump ran far longer than normal without reaching or holding its target… High C1256 Toyota · Chassis The brake system's high-pressure accumulator is below its minimum, so power brake assist can't… Critical C1391 Toyota · Chassis The hybrid brake system is losing stored hydraulic pressure internally, so the pump keeps… High C2217 Jeep · Chassis The electric power steering module found a fault inside itself and may reduce or cut steering… High P0001 Powertrain The PCM can't drive the solenoid that meters fuel into the high-pressure pump. Often a no-start… High P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High