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.
- P2AA3Generic · PowertrainCold Start EGR B Flow Insufficient Detected
- P2AA4Generic · PowertrainCold Start EGR B Flow Excessive Detected
- P2AA5Generic · PowertrainEGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 1
- P2AA6Generic · PowertrainEGR Cooler Bypass Control Circuit Driver Current/Temperature Too High Bank 2
- P2AA7Generic · PowertrainEngine Coolant Bypass Valve B Position Sensor Circuit
- P2AA8Generic · PowertrainEngine Coolant Bypass Valve B Position Sensor Circuit Range/Performance
- P2AA9Generic · PowertrainEngine Coolant Bypass Valve B Position Sensor Circuit Low
- P2AAAGeneric · PowertrainEngine Coolant Bypass Valve B Position Sensor Circuit High
- P2AABGeneric · PowertrainEngine Coolant Bypass Valve B Position Sensor Circuit Intermittent/Erratic
- P2AACGeneric · PowertrainDiesel Fuel Presence Sensor Circuit
- P2AADGeneric · PowertrainDiesel Fuel Presence Sensor Circuit Range/Performance
- P2AAEGeneric · PowertrainDiesel Fuel Presence Sensor Circuit Low
- P2AAFGeneric · PowertrainDiesel Fuel Presence Sensor Circuit High
- P2AB0Generic · PowertrainParticulate Matter Sensor Processor Performance
- P2AB1Generic · PowertrainCatalyst Heater Control Module Performance
- P2AB2Generic · PowertrainCatalyst Heater Control Module Supply Voltage
- P2AB3Generic · PowertrainCold Start Intake Manifold Runner Control Stuck Open Bank 1
- P2AB4Generic · PowertrainCold Start Intake Manifold Runner Control Stuck Open Bank 2
- P2AB5Generic · PowertrainCold Start Intake Manifold Runner Control Stuck Closed Bank 1
- P2AB6Generic · PowertrainCold Start Intake Manifold Runner Control Stuck Closed Bank 2
- P2AB7Generic · PowertrainWastegate Position Sensor A Circuit
- 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