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.
- P2ADFGeneric · PowertrainIntake Air System Leak Bank 2
- P2AE0Generic · PowertrainIntake Air O2 Sensor Pumping Current Trim Circuit Open Bank 1
- P2AE1Generic · PowertrainIntake Air O2 Sensor Pumping Current Trim Circuit Low Bank 1
- P2AE2Generic · PowertrainIntake Air O2 Sensor Pumping Current Trim Circuit High Bank 1
- P2AE3Generic · PowertrainIntake Air O2 Sensor Pumping Current Circuit Open Bank 1
- P2AE4Generic · PowertrainIntake Air O2 Sensor Pumping Current Circuit Low Bank 1
- P2AE5Generic · PowertrainIntake Air O2 Sensor Pumping Current Circuit High Bank 1
- P2AE6Generic · PowertrainIntake Air O2 Sensor Negative Current Control Circuit Open Bank 1
- P2AE7Generic · PowertrainIntake Air O2 Sensor Negative Current Control Circuit Low Bank 1
- P2AE8Generic · PowertrainIntake Air O2 Sensor Negative Current Control Circuit High Bank 1
- P2AE9Generic · PowertrainIntake Air O2 Sensor Pumping Current Trim Circuit Open Bank 2
- P2AEAGeneric · PowertrainIntake Air O2 Sensor Pumping Current Trim Circuit Low Bank 2
- P2AEBGeneric · PowertrainIntake Air O2 Sensor Pumping Current Trim Circuit High Bank 2
- P2AECGeneric · PowertrainIntake Air O2 Sensor Pumping Current Circuit Open Bank 2
- P2AEDGeneric · PowertrainIntake Air O2 Sensor Pumping Current Circuit Low Bank 2
- P2AEEGeneric · PowertrainIntake Air O2 Sensor Pumping Current Circuit High Bank 2
- P2AEFGeneric · PowertrainIntake Air O2 Sensor Negative Current Control Circuit Open Bank 2
- P2AF0Generic · PowertrainIntake Air O2 Sensor Negative Current Control Circuit Low Bank 2
- P2AF1Generic · PowertrainIntake Air O2 Sensor Negative Current Control Circuit High Bank 2
- P2AF2Generic · PowertrainStarter Relay C Control Circuit/Open
- P2AF3Generic · PowertrainStarter Relay C Control Circuit Low
- P2AF4Generic · PowertrainStarter Relay C Control Circuit High
- P2AF5Generic · PowertrainStarter Relay C Stuck On
- P2AF6Generic · PowertrainStarter Relay C Stuck Off
- P2AF7Generic · PowertrainStarter Relay D Control Circuit/Open
- P2AF8Generic · PowertrainStarter Relay D Control Circuit Low
- P2AF9Generic · PowertrainStarter Relay D Control Circuit High
- P2AFAGeneric · PowertrainStarter Relay D Stuck On
- P2AFBGeneric · PowertrainStarter Relay D Stuck Off
- P2AFCGeneric · PowertrainEngine Coolant Temperature Sensor 4 Circuit