Code is a clue
OBD-II
LOOKUP.
Use the code to choose a test—not a replacement part. Search the JSON-backed catalog, then confirm the circuit under the conditions that set it.
How to read a code
P Powertrain · B Body · C Chassis · U Network
0 generic SAE · 1 manufacturer-specific
| 3rd character | System | Examples |
|---|---|---|
| 0–1 | Fuel & air metering | MAF, MAP, mixture |
| 2 | Injector circuit | Injector control |
| 3 | Ignition / misfire | Coils, plugs, CKP |
| 4 | Emissions controls | O₂, EGR, catalyst |
| 5–6 | Idle, speed & computer | Idle control, ECU |
| 7–9 | Transmission | Shift, pressure, ratio |
ENTER A DTC
Search by code.
261 diagnostic trouble codes
Search code numbers, definitions, symptoms, causes or suggested tests. Generic information is a starting point; verify the exact vehicle definition and manufacturer subcodes.
The 223 additional code records include definitions attributed to Wal33D/dtc-database. Read the included MIT license.