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.
- P2C29Generic · PowertrainTurbocharger/Supercharger Bypass Valve B Stuck
- P2C2AGeneric · PowertrainTurbocharger/Supercharger Bypass Valve B Position Sensor Circuit/Open
- P2C2BGeneric · PowertrainTurbocharger/Supercharger Bypass Valve B Position Sensor Circuit Low
- P2C2CGeneric · PowertrainTurbocharger/Supercharger Bypass Valve B Position Sensor Circuit High
- P2C2DGeneric · PowertrainTurbocharger/Supercharger Bypass Valve B Position Exceeded Learning Limit
- P2C2EGeneric · PowertrainTurbocharger/Supercharger Bypass Valve B Supply Voltage Low
- P2C2FGeneric · PowertrainTurbocharger/Supercharger Bypass Valve B Driver Current/Temperature Too High
- P2C30Generic · PowertrainIgnition Coil Primary Circuit Fuse A
- P2C31Generic · PowertrainIgnition Coil Primary Circuit Fuse B
- P2C32Generic · PowertrainCrankcase Pressure Sensor B Circuit
- P2C33Generic · PowertrainCrankcase Pressure Sensor B Circuit Range/Performance
- P2C34Generic · PowertrainCrankcase Pressure Sensor B Circuit Low
- P2C35Generic · PowertrainCrankcase Pressure Sensor B Circuit High
- P2C36Generic · PowertrainCrankcase Pressure Sensor B Circuit Intermittent/Erratic
- P2C37Generic · PowertrainCold Start Engine Coolant Pump Performance
- P2C38Generic · PowertrainCylinder Head Temperature Sensor B Circuit
- P2C39Generic · PowertrainCylinder Head Temperature Sensor B Range/Performance
- P2C3AGeneric · PowertrainCylinder Head Temperature Sensor B Circuit Low
- P2C3BGeneric · PowertrainCylinder Head Temperature Sensor B Circuit High
- P2C3CGeneric · PowertrainCylinder Head Temperature Sensor B Circuit Intermittent/Erratic
- P2C3DGeneric · PowertrainCylinder Head Temperature Sensor A/B Correlation
- P2C3EGeneric · PowertrainFan 4 Control Circuit
- P2C3FGeneric · PowertrainFan 4 Control Circuit Low
- P2C40Generic · PowertrainFan 4 Control Circuit High
- P2C41Generic · PowertrainFan 3 Performance/Stuck Off
- P2C42Generic · PowertrainFan 4 Performance/Stuck Off
- P2C43Generic · PowertrainBattery Isolation/Voltage Stabilization Control Circuit
- P2C44Generic · PowertrainBattery Isolation/Voltage Stabilization Control Circuit Performance
- P2C45Generic · PowertrainBattery Isolation/Voltage Stabilization Control Circuit Low
- P2C46Generic · PowertrainBattery Isolation/Voltage Stabilization Control Circuit High