OBD2 Trouble Code (DTC) Reference

Look up check engine, ABS, airbag, and network communication codes — and find the right TOPDON scanner to diagnose them.

Diagnostic trouble codes (DTCs) point to the system that failed — not always the part to replace. P-codes cover engine and emissions; C-codes point to ABS and chassis; U-codes indicate CAN network communication faults; B-codes relate to airbags and SRS. Use this reference, then scan with a TOPDON tool that matches the required depth.

P P-codes — Powertrain & Emissions 514 codes

C C-codes — Chassis, ABS & Stability 56 codes

U U-codes — Network & CAN Bus 86 codes

B B-codes — Airbag & SRS 83 codes