What does your fault code mean?

Free OBD2 fault code lookup

A diagnostic trouble code (DTC) is your car's way of telling you something needs attention. This free lookup covers the 200 most common OBD2 fault codes — plain-English meanings, causes, severity, and what to do next.

What do the letters mean?

OBD2 fault codes always start with one of four letters. The letter tells you which system in your car is affected.