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.
- P2AFDGeneric · PowertrainEngine Coolant Temperature Sensor 4 Circuit Range/Performance
- P2AFEGeneric · PowertrainEngine Coolant Temperature Sensor 4 Circuit Low
- P2AFFGeneric · PowertrainEngine Coolant Temperature Sensor 4 Circuit High
- P2B00Generic · PowertrainCylinder 1 Injection Pulse Performance
- P2B01Generic · PowertrainCylinder 2 Injection Pulse Performance
- P2B02Generic · PowertrainCylinder 3 Injection Pulse Performance
- P2B03Generic · PowertrainCylinder 4 Injection Pulse Performance
- P2B04Generic · PowertrainCylinder 5 Injection Pulse Performance
- P2B05Generic · PowertrainCylinder 6 Injection Pulse Performance
- P2B06Generic · PowertrainCylinder 7 Injection Pulse Performance
- P2B07Generic · PowertrainCylinder 8 Injection Pulse Performance
- P2B08Generic · PowertrainCold Start Cylinder 1 Injection Pulse Performance
- P2B09Generic · PowertrainCold Start Cylinder 2 Injection Pulse Performance
- P2B0AGeneric · PowertrainCold Start Cylinder 3 Injection Pulse Performance
- P2B0BGeneric · PowertrainCold Start Cylinder 4 Injection Pulse Performance
- P2B0CGeneric · PowertrainCold Start Cylinder 5 Injection Pulse Performance
- P2B0DGeneric · PowertrainCold Start Cylinder 6 Injection Pulse Performance
- P2B0EGeneric · PowertrainCold Start Cylinder 7 Injection Pulse Performance
- P2B0FGeneric · PowertrainCold Start Cylinder 8 Injection Pulse Performance
- P2B10Generic · PowertrainCylinder 1 Injection Pulse Offset Not Learned
- P2B11Generic · PowertrainCylinder 1 Injection Pulse Offset Exceeded Learning Limit
- P2B12Generic · PowertrainCylinder 2 Injection Pulse Offset Not Learned
- P2B13Generic · PowertrainCylinder 2 Injection Pulse Offset Exceeded Learning Limit
- P2B14Generic · PowertrainCylinder 3 Injection Pulse Offset Not Learned
- P2B15Generic · PowertrainCylinder 3 Injection Pulse Offset Exceeded Learning Limit
- P2B16Generic · PowertrainCylinder 4 Injection Pulse Offset Not Learned
- P2B17Generic · PowertrainCylinder 4 Injection Pulse Offset Exceeded Learning Limit
- P2B18Generic · PowertrainCylinder 5 Injection Pulse Offset Not Learned
- P2B19Generic · PowertrainCylinder 5 Injection Pulse Offset Exceeded Learning Limit
- P2B1AGeneric · PowertrainCylinder 6 Injection Pulse Offset Not Learned