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.
- P2310Audi · PowertrainIgnition coil failure, Powertrain Control Module (PCM) failure, Wiring issue
- 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
- P231AGeneric · PowertrainCylinder 7 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P231BGeneric · PowertrainCylinder 8 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P231CGeneric · PowertrainCylinder 9 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P231DGeneric · PowertrainCylinder 10 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P231EGeneric · PowertrainCylinder 11 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P231FGeneric · PowertrainCylinder 12 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
- P2320Generic · PowertrainIgnition Coil G Secondary Circuit
- P2321Generic · PowertrainIgnition Coil H Primary Control Circuit Low
- P2322Generic · PowertrainIgnition Coil H Primary Control Circuit High
- P2323Generic · PowertrainIgnition Coil H Secondary Circuit
- P2324Generic · PowertrainIgnition Coil I Primary Control Circuit Low
- P2325Generic · PowertrainIgnition Coil I Primary Control Circuit High
- P2326Generic · PowertrainIgnition Coil I Secondary Circuit
- P2327Generic · PowertrainIgnition Coil J Primary Control Circuit Low
- P2328Generic · PowertrainIgnition Coil J Primary Control Circuit High
- P2329Generic · PowertrainIgnition Coil J Secondary Circuit
- P232AGeneric · PowertrainTCM Request - Forced Engine Shutdown
- P232BGeneric · PowertrainCylinder 11 Fuel Injector A Offset Learning At Min Limit
- P232CGeneric · PowertrainCylinder 11 Fuel Injector A Offset Learning At Max Limit
- P232DGeneric · PowertrainCylinder 12 Fuel Injector A Offset Learning At Min Limit