OBD-II Fault Codes by Category

Misfires, sensors, fuel system, ignition, VVT, throttle, and general engine codes.

Shift solenoids, torque converter, gear ratios, TCM, clutch, and fluid pressure codes.

EGR system, catalytic converter efficiency, secondary air injection codes.

Evaporative emission system leaks, purge valve, vent valve, and pressure sensor codes.

CAN bus errors, lost communication with modules, PCM/ECM internal faults, U-codes.

Airbags, SRS, lighting, HVAC, power windows, door locks, instrument cluster, B-codes.

ABS, traction control, stability control, steering, brakes, suspension, C-codes.