DTC codes
Look up an OBD-II fault code: what it means on every car or on your make, and how to track it down.
How to read a code
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 4
- AreaAuxiliary emission controls
- 20
- FaultThe specific fault in that area
Read the code
Note every stored and pending code your scanner shows, such as P0420.
Find it
Search by code or by words. For a manufacturer code (P1, B1, C1, U1) pick your make: its meaning differs by make.
Open the code
Its page explains the symptoms, likely causes, the checks to run and the fixes.
- P02C8Generic · PowertrainCylinder 12 - Injector Restricted
- P02C9Generic · PowertrainCylinder 12 - Injector Leaking
- P02CAGeneric · PowertrainTurbocharger/Supercharger B Overboost Condition
- P02CBGeneric · PowertrainTurbocharger/Supercharger B Underboost Condition
- P02CCGeneric · PowertrainCylinder 1 Fuel Injector A Offset Learning At Min Limit
- P02CDGeneric · PowertrainCylinder 1 Fuel Injector A Offset Learning At Max Limit
- P02CEGeneric · PowertrainCylinder 2 Fuel Injector A Offset Learning At Min Limit
- P02CFGeneric · PowertrainCylinder 2 Fuel Injector A Offset Learning At Max Limit
- P02D0Generic · PowertrainCylinder 3 Fuel Injector A Offset Learning At Min Limit
- P02D1Generic · PowertrainCylinder 3 Fuel Injector A Offset Learning At Max Limit
- P02D2Generic · PowertrainCylinder 4 Fuel Injector A Offset Learning At Min Limit
- P02D3Generic · PowertrainCylinder 4 Fuel Injector A Offset Learning At Max Limit
- P02D4Generic · PowertrainCylinder 5 Fuel Injector A Offset Learning At Min Limit
- P02D5Generic · PowertrainCylinder 5 Fuel Injector A Offset Learning At Max Limit
- P02D6Generic · PowertrainCylinder 6 Fuel Injector A Offset Learning At Min Limit
- P02D7Generic · PowertrainCylinder 6 Fuel Injector A Offset Learning At Max Limit
- P02D8Generic · PowertrainCylinder 7 Fuel Injector A Offset Learning At Min Limit
- P02D9Generic · PowertrainCylinder 7 Fuel Injector A Offset Learning At Max Limit
- P02DAGeneric · PowertrainCylinder 8 Fuel Injector A Offset Learning At Min Limit
- P02DBGeneric · PowertrainCylinder 8 Fuel Injector A Offset Learning At Max Limit
- P02DCGeneric · PowertrainCylinder 9 Fuel Injector A Offset Learning At Min Limit
- P02DDGeneric · PowertrainCylinder 9 Fuel Injector A Offset Learning At Max Limit
- P02DEGeneric · PowertrainCylinder 10 Fuel Injector A Offset Learning At Min Limit
- P02DFGeneric · PowertrainCylinder 10 Fuel Injector A Offset Learning At Max Limit
- P02E0Generic · PowertrainDiesel Intake Air Flow A Control Circuit/Open
- P02E1Generic · PowertrainDiesel Intake Air Flow A Control Performance
- P02E2Generic · PowertrainDiesel Intake Air Flow A Control Circuit Low
- P02E3Generic · PowertrainDiesel Intake Air Flow A Control Circuit High
- P02E4Generic · PowertrainDiesel Intake Air Flow A Control Stuck Open
- P02E5Generic · PowertrainDiesel Intake Air Flow A Control Stuck Closed