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.
- P28AEGeneric · PowertrainCylinder 8 Ion Current Sense Circuit Low
- P28AFGeneric · PowertrainCylinder 8 Ion Current Sense Circuit High
- P28B0Generic · PowertrainCylinder 9 Ion Current Sense Circuit
- P28B1Generic · PowertrainCylinder 9 Ion Current Sense Circuit Range/Performance
- P28B2Generic · PowertrainCylinder 9 Ion Current Sense Circuit Low
- P28B3Generic · PowertrainCylinder 9 Ion Current Sense Circuit High
- P28B4Generic · PowertrainCylinder 10 Ion Current Sense Circuit
- P28B5Generic · PowertrainCylinder 10 Ion Current Sense Circuit Range/Performance
- P28B6Generic · PowertrainCylinder 10 Ion Current Sense Circuit Low
- P28B7Generic · PowertrainCylinder 10 Ion Current Sense Circuit High
- P28B8Generic · PowertrainCylinder 11 Ion Current Sense Circuit
- P28B9Generic · PowertrainCylinder 11 Ion Current Sense Circuit Range/Performance
- P28BAGeneric · PowertrainCylinder 11 Ion Current Sense Circuit Low
- P28BBGeneric · PowertrainCylinder 11 Ion Current Sense Circuit High
- P28BCGeneric · PowertrainCylinder 12 Ion Current Sense Circuit
- P28BDGeneric · PowertrainCylinder 12 Ion Current Sense Circuit Range/Performance
- P28BEGeneric · PowertrainCylinder 12 Ion Current Sense Circuit Low
- P28BFGeneric · PowertrainCylinder 12 Ion Current Sense Circuit High
- P28C0Generic · PowertrainIon Sense Module Supply Voltage Circuit
- P28C1Generic · PowertrainIon Sense Module Supply Voltage Low
- P28C2Generic · PowertrainIon Sense Module Supply Voltage High
- P28C3Generic · PowertrainEVAP System High Load Purge Line B Performance
- P28C4Generic · PowertrainClutch A Motor Phase U-V-W Circuit Low
- P28C5Generic · PowertrainClutch A Motor Phase U-V-W Circuit High
- P28C6Generic · PowertrainClutch A Motor Phase U-V-W Circuit/Open
- P28C7Generic · PowertrainClutch A Motor Phase U-V-W Performance
- P28C8Generic · PowertrainClutch A Pump Motor Performance
- P28C9Generic · PowertrainClutch A Motor Overspeed
- P28CAGeneric · PowertrainClutch A Motor Underspeed
- P28CBGeneric · PowertrainClutch A Motor Position Sensor Circuit/Open