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.
- P2176Generic · PowertrainThrottle Actuator A Control System - Idle Position Not Learned
- P2177Generic · PowertrainSystem Too Lean Off Idle Bank 1
- P2178Generic · PowertrainSystem Too Rich Off Idle Bank 1
- P2179Generic · PowertrainSystem Too Lean Off Idle Bank 2
- P217AGeneric · PowertrainFuel Injector Group G Supply Voltage Circuit/Open
- P217BGeneric · PowertrainFuel Injector Group G Supply Voltage Circuit Low
- P217CGeneric · PowertrainFuel Injector Group G Supply Voltage Circuit High
- P217DGeneric · PowertrainFuel Injector Group H Supply Voltage Circuit/Open
- P217EGeneric · PowertrainFuel Injector Group H Supply Voltage Circuit Low
- P217FGeneric · PowertrainFuel Injector Group H Supply Voltage Circuit High
- P2180Generic · PowertrainSystem Too Rich Off Idle Bank 2
- P2181Generic · PowertrainCooling System Performance
- P2182Generic · PowertrainEngine Coolant Temperature Sensor 2 Circuit
- P2183Generic · PowertrainEngine Coolant Temperature Sensor 2 Circuit Range/Performance
- P2184Generic · PowertrainEngine Coolant Temperature Sensor 2 Circuit Low
- P2185Generic · PowertrainEngine Coolant Temperature Sensor 2 Circuit High
- P2186Generic · PowertrainEngine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic
- P2187Generic · PowertrainSystem Too Lean at Idle Bank 1
- P2188Generic · PowertrainSystem Too Rich at Idle Bank 1
- P2189Generic · PowertrainSystem Too Lean at Idle Bank 2
- P218AGeneric · PowertrainThrottle Actuator B Control System - Idle Position Not Learned
- P218BGeneric · PowertrainThrottle/Fuel Inhibit B Circuit
- P218CGeneric · PowertrainThrottle/Fuel Inhibit B Circuit Range/Performance
- P218DGeneric · PowertrainThrottle/Fuel Inhibit B Circuit Low
- P218EGeneric · PowertrainThrottle/Fuel Inhibit B Circuit High
- P218FGeneric · PowertrainReductant No Flow Detected
- P2190Generic · PowertrainSystem Too Rich at Idle Bank 2
- P2191Generic · PowertrainSystem Too Lean at Higher Load Bank 1
- P2192Generic · PowertrainSystem Too Rich at Higher Load Bank 1
- P2193Generic · PowertrainSystem Too Lean at Higher Load Bank 2