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.
- P22FCGeneric · PowertrainNOx Sensor Performance - Slow Response Low to High Bank 1 Sensor 2
- P22FDGeneric · PowertrainNOx Sensor Performance - Slow Response High to Low Bank 1 Sensor 2
- P22FEGeneric · PowertrainNOx Sensor Performance - Sensing Element Bank 1 Sensor 2
- P22FFGeneric · PowertrainSCR NOx Catalyst Inlet Temperature Too Low
- P2300Generic · PowertrainIgnition Coil A Primary Control Circuit Low
- P2301Generic · PowertrainIgnition Coil A Primary Control Circuit High
- P2302Generic · PowertrainIgnition Coil A Secondary Circuit
- P2303Generic · PowertrainIgnition Coil B Primary Control Circuit Low
- P2304Generic · PowertrainIgnition Coil B Primary Control Circuit High
- P2305Generic · PowertrainIgnition Coil B Secondary Circuit
- P2306Generic · PowertrainIgnition Coil C Primary Control Circuit Low
- P2307Generic · PowertrainIgnition Coil C Primary Control Circuit High
- P2308Generic · PowertrainIgnition Coil C Secondary Circuit
- P2309Generic · PowertrainIgnition Coil D Primary Control Circuit Low
- P230AGeneric · PowertrainCylinder 1 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P230BGeneric · PowertrainCylinder 2 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P230CGeneric · PowertrainCylinder 3 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P230DGeneric · PowertrainCylinder 4 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P230EGeneric · PowertrainCylinder 5 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P230FGeneric · PowertrainCylinder 6 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P2310Generic · PowertrainIgnition Coil D Primary Control Circuit High
- P2311Generic · PowertrainIgnition Coil D Secondary Circuit
- P2312Generic · PowertrainIgnition Coil E Primary Control Circuit Low
- P2313Generic · PowertrainIgnition Coil E Primary Control Circuit High
- P2314Generic · PowertrainIgnition Coil E Secondary Circuit
- P2315Generic · PowertrainIgnition Coil F Primary Control Circuit Low
- P2316Generic · PowertrainIgnition Coil F Primary Control Circuit High
- P2317Generic · PowertrainIgnition Coil F Secondary Circuit
- P2318Generic · PowertrainIgnition Coil G Primary Control Circuit Low
- P2319Generic · PowertrainIgnition Coil G Primary Control Circuit High