Definitions, severity levels, drivability advice, and technician-verified workshop repairs for over 59 OBD2 trouble codes.
Diagnostic Trouble Codes are logged by your vehicle's engine control unit (ECU/ECM) when system telemetry falls outside safe calibrated thresholds. Use the library below to navigate by vehicle subsystem: Powertrain (P) controls engine, fuel, and transmission; Chassis (C) monitors ABS, traction, and steering; Body (B) handles passenger compartment electronics; and Network (U) governs high-speed CAN bus communication between modules.
Generic codes grouped by the part or system they monitor. Each group explains what the component does and what each fault type means.