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.
- P2AB8Generic · PowertrainWastegate Position Sensor A Circuit Low
- P2AB9Generic · PowertrainWastegate Position Sensor A Circuit High
- P2ABAGeneric · PowertrainWastegate Position Sensor B Circuit
- P2ABBGeneric · PowertrainWastegate Position Sensor B Circuit Low
- P2ABCGeneric · PowertrainWastegate Position Sensor B Circuit High
- P2ABDGeneric · PowertrainTurbocharger/Supercharger Wastegate Actuator A Driver Current/Temperature Too High
- P2ABEGeneric · PowertrainTurbocharger/Supercharger Wastegate Actuator B Driver Current/Temperature Too High
- P2ABFGeneric · PowertrainIntake Air O2 Sensor Reference Voltage Circuit/Open Bank 1
- P2AC0Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 1
- P2AC1Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit Low Bank 1
- P2AC2Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit High Bank 1
- P2AC3Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit/Open Bank 2
- P2AC4Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 2
- P2AC5Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit Low Bank 2
- P2AC6Generic · PowertrainIntake Air O2 Sensor Reference Voltage Circuit High Bank 2
- P2AC7Generic · PowertrainCharge Air Cooler Coolant Temperature Sensor B Circuit
- P2AC8Generic · PowertrainCharge Air Cooler Coolant Temperature Sensor B Circuit Range/Performance
- P2AC9Generic · PowertrainCharge Air Cooler Coolant Temperature Sensor B Circuit Low
- P2ACAGeneric · PowertrainCharge Air Cooler Coolant Temperature Sensor B Circuit High
- P2ACBGeneric · PowertrainCharge Air Cooler Coolant Temperature Sensor B Intermittent/Erratic
- P2ACCGeneric · PowertrainReductant Temperature Sensor B Circuit
- P2ACDGeneric · PowertrainReductant Temperature Sensor B Circuit Range/Performance
- P2ACEGeneric · PowertrainReductant Temperature Sensor B Circuit Low
- P2ACFGeneric · PowertrainReductant Temperature Sensor B Circuit High
- P2AD0Generic · PowertrainReductant Temperature Sensor B Circuit Intermittent
- P2AD1Generic · PowertrainThrottle/Pedal Position Sensor/Switch C/G Voltage Correlation
- P2AD2Generic · PowertrainThrottle/Pedal Position Sensor/Switch B/G Voltage Correlation
- P2AD3Generic · PowertrainThrottle/Pedal Position Sensor/Switch A/G Voltage Correlation
- P2AD4Generic · PowertrainIntermediate System Voltage Low
- P2AD5Generic · PowertrainIntermediate System Voltage High