Find the exact definition, driving safety level, symptoms, and potential repairs for your vehicle's check engine light codes.
Diagnostic Trouble Codes (DTCs) are codes generated by your car's onboard computer system (OBD) when it detects a sensor reading outside normal parameters. The system was standardized in 1996 to enable rapid identification of vehicle malfunctions. The letters in the code categorize the system: P stands for Powertrain (Engine & Transmission), C for Chassis (Brakes & Steering), B for Body (Climate, Airbags, Lights), and U for Network communications (CAN bus & ECUs).