Car Fault Codes (OBD-II)
OBD-II diagnostic trouble codes are what a scanner reads out of a car's computer — P0420 is the classic catalytic converter warning. The generic SAE J2012 meaning is shown first; many codes also have a different manufacturer-specific reading, so the brand matters. A code names the symptom the car reported, not the part to replace: this is a reference index, not repair advice.
U2500(CAN) Lack of Acknowledgement From Engine ManagementP07811-2 ShiftP17311-2 Shift MalfunctionP18431-2 Shift Solenoid Circuit High VoltageP18421-2 Shift Solenoid Circuit Low VoltageP16641-4 Upshift Lamp Control CircuitP16571-4 Upshift Solenoid Control CircuitP0A8614 Volt Power Module Current Sensor A CircuitP0A8914 Volt Power Module Current Sensor A Circuit HighP0A8A14 Volt Power Module Current Sensor A Circuit IntermittentP0A8814 Volt Power Module Current Sensor A Circuit LowP0A8714 Volt Power Module Current Sensor A Circuit Range/PerformanceP0CC514 Volt Power Module Current Sensor A/B CorrelationP0C9C14 Volt Power Module Current Sensor B CircuitP0C9F14 Volt Power Module Current Sensor B Circuit HighP0CA014 Volt Power Module Current Sensor B Circuit IntermittentP0C9E14 Volt Power Module Current Sensor B Circuit LowP0C9D14 Volt Power Module Current Sensor B Circuit Range/PerformanceP0AF714 Volt Power Module Internal Temperature Too HighP0A8F14 Volt Power Module System PerformanceP0A8B14 Volt Power Module System VoltageP0A8E14 Volt Power Module System Voltage HighP0A8D14 Volt Power Module System Voltage LowP0A8C14 Volt Power Module System Voltage UnstableP17872-1 Downshift ErrorP07822-3 ShiftP17322-3 Shift MalfunctionP18472-3 Shift Solenoid Circuit High VoltageP17592-4 Brake Failsafe Valve MalfunctionC00712/4 Wheel Drive Status InputP137524X Reference Circuit High VoltageP132324X Reference Circuit Low FrequencyP17863-2 Downshift ErrorP07833-4 ShiftP17333-4 Shift MalfunctionP13743X Reference CircuitP07844-5 ShiftP18754WD Low Switch CircuitC05DB4WD/AWD Clutch A Actuator Control Circuit HighC05DA4WD/AWD Clutch A Actuator Control Circuit LowC05D94WD/AWD Clutch A Actuator Control Circuit PerformanceC05D84WD/AWD Clutch A Actuator Control Circuit/OpenC05DF4WD/AWD Clutch A Engagement FaultC05DD4WD/AWD Clutch A Performance/Stuck DisengagedC05E64WD/AWD Clutch A Position Control ErrorC05E54WD/AWD Clutch A Position Not LearnedC05E04WD/AWD Clutch A Position Sensor CircuitC05E34WD/AWD Clutch A Position Sensor Circuit HighC05E44WD/AWD Clutch A Position Sensor Circuit IntermittentC05E24WD/AWD Clutch A Position Sensor Circuit LowC05E14WD/AWD Clutch A Position Sensor Circuit Range/PerformanceC05DE4WD/AWD Clutch A Stuck EngagedC05DC4WD/AWD Clutch A Temperature Too HighC05EA4WD/AWD Clutch B Actuator Control Circuit HighC05E94WD/AWD Clutch B Actuator Control Circuit LowC05E84WD/AWD Clutch B Actuator Control Circuit PerformanceC05E74WD/AWD Clutch B Actuator Control Circuit/OpenC05EE4WD/AWD Clutch B Engagement FaultC05EC4WD/AWD Clutch B Performance/Stuck DisengagedC05EF4WD/AWD Clutch B Position Control ErrorC05ED4WD/AWD Clutch B Stuck EngagedC05EB4WD/AWD Clutch B Temperature Too HighC00904WD/AWD Power Transfer Unit ActuatorC00914WD/AWD Power Transfer Unit Position Sensor AC00924WD/AWD Power Transfer Unit Position Sensor BC00934WD/AWD Power Transfer Unit Temperature SensorC05F84WD/AWD Range Actuator Control Circuit HighC05F74WD/AWD Range Actuator Control Circuit LowC05F64WD/AWD Range Actuator Control Circuit PerformanceC05F54WD/AWD Range Actuator Control Circuit/OpenC05FA4WD/AWD Range Actuator Performance/StuckC06004WD/AWD Range Actuator Position Control ErrorC05FF4WD/AWD Range Actuator Position Not LearnedC05FB4WD/AWD Range Actuator Position Sensor CircuitC05FE4WD/AWD Range Actuator Position Sensor Circuit HighC05FD4WD/AWD Range Actuator Position Sensor Circuit LowC05FC4WD/AWD Range Actuator Position Sensor Circuit Range/PerformanceC05F94WD/AWD Range Actuator Temperature Too HighC00954WD/AWD Rear Differential Unit Actuator AC00964WD/AWD Rear Differential Unit Actuator A DataC00994WD/AWD Rear Differential Unit Actuator A Position Sensor AC009A4WD/AWD Rear Differential Unit Actuator A Position Sensor BC009B4WD/AWD Rear Differential Unit Actuator A Position Sensor CC009C4WD/AWD Rear Differential Unit Actuator A Position Sensor CorrelationC00974WD/AWD Rear Differential Unit Actuator BC00984WD/AWD Rear Differential Unit Actuator B DataC009D4WD/AWD Rear Differential Unit Actuator B Position Sensor AC009E4WD/AWD Rear Differential Unit Actuator B Position Sensor BC009F4WD/AWD Rear Differential Unit Actuator B Position Sensor CC00A04WD/AWD Rear Differential Unit Actuator B Position Sensor CorrelationC00944WD/AWD Rear Differential Unit Temperature SensorC00A64WD/AWD Transfer Case Unit ActuatorC00A74WD/AWD Transfer Case Unit Actuator Position Sensor AC00A84WD/AWD Transfer Case Unit Actuator Position Sensor BP17294x4 Low Switch ErrorP17814x4 Low Switch is Out of Self-Test RangeP14965 Volt Supply Output Too LowP08295-6 ShiftP07DA6-7 ShiftP07DB7-8 ShiftP25DDA Camshaft Position - Stuck In Locked Position Bank 1P25E0A Camshaft Position - Stuck In Locked Position Bank 2P0011A Camshaft Position - Timing Over-Advanced or System Performance Bank 1P0021A Camshaft Position - Timing Over-Advanced or System Performance Bank 2P0012A Camshaft Position - Timing Over-Retarded Bank 1P0022A Camshaft Position - Timing Over-Retarded Bank 2P25DEA Camshaft Position - Unable to Achieve Locked Position Bank 1P25E1A Camshaft Position - Unable to Achieve Locked Position Bank 2P0010A Camshaft Position Actuator A Control Circuit/Open Bank 1P0020A Camshaft Position Actuator A Control Circuit/Open Bank 2P1522A Camshaft Position Actuator Bank 2P34C4A Camshaft Position Actuator Control Circuit Driver Current/Temperature Too High Bank 1P34C5A Camshaft Position Actuator Control Circuit Driver Current/Temperature Too High Bank 2P2089A Camshaft Position Actuator Control Circuit High Bank 1P2093A Camshaft Position Actuator Control Circuit High Bank 2P2088A Camshaft Position Actuator Control Circuit Low Bank 1P2092A Camshaft Position Actuator Control Circuit Low Bank 2P1528A Camshaft Position Actuator Control Circuit Signal High Bank 1P1527A Camshaft Position Actuator Control Circuit Signal Low Bank 1P1525A Camshaft Position Actuator Control Open Circuit Bank 1P1551A Camshaft Position Actuator Control Open Circuit Bank 1P1552A Camshaft Position Actuator Control Open Circuit Bank 1P1556A Camshaft Position Actuator Control Open Circuit Bank 1P1526A Camshaft Position Actuator Control Open Circuit Bank 2P1569A Camshaft Position Actuator Control Open Circuit Bank 2P34ACA Camshaft Position Actuator Position Sensor A Circuit Bank 1P34B0A Camshaft Position Actuator Position Sensor A Circuit Bank 2P34AFA Camshaft Position Actuator Position Sensor A Circuit High Bank 1P34B3A Camshaft Position Actuator Position Sensor A Circuit High Bank 2P34AEA Camshaft Position Actuator Position Sensor A Circuit Low Bank 1P34B2A Camshaft Position Actuator Position Sensor A Circuit Low Bank 2P34ADA Camshaft Position Actuator Position Sensor A Range/Performance Bank 1P34B1A Camshaft Position Actuator Position Sensor A Range/Performance Bank 2P2B3FA Camshaft Position Actuator Position Sensor B Circuit Bank 1P2B43A Camshaft Position Actuator Position Sensor B Circuit Bank 2P2B42A Camshaft Position Actuator Position Sensor B Circuit High Bank 1P2B46A Camshaft Position Actuator Position Sensor B Circuit High Bank 2P2B41A Camshaft Position Actuator Position Sensor B Circuit Low Bank 1P2B45A Camshaft Position Actuator Position Sensor B Circuit Low Bank 2P2B40A Camshaft Position Actuator Position Sensor B Range/Performance Bank 1P2B44A Camshaft Position Actuator Position Sensor B Range/Performance Bank 2P03E5A Camshaft Position Actuator Position Sensor C Circuit Bank 1P03E8A Camshaft Position Actuator Position Sensor C Circuit High Bank 1P03E7A Camshaft Position Actuator Position Sensor C Circuit Low Bank 1P03E6A Camshaft Position Actuator Position Sensor C Range/Performance Bank 1P1524A Camshaft Position Actuator Signal High Bank 1P1523A Camshaft Position Actuator Signal Low Bank 1P34A4A Camshaft Position Actuator Temperature Sensor Circuit Bank 1P34A8A Camshaft Position Actuator Temperature Sensor Circuit Bank 2P34A7A Camshaft Position Actuator Temperature Sensor Circuit High Bank 1P34ABA Camshaft Position Actuator Temperature Sensor Circuit High Bank 2P34A6A Camshaft Position Actuator Temperature Sensor Circuit Low Bank 1P34AAA Camshaft Position Actuator Temperature Sensor Circuit Low Bank 2P34A5A Camshaft Position Actuator Temperature Sensor Range/Performance Bank 1P34A9A Camshaft Position Actuator Temperature Sensor Range/Performance Bank 2P25DFA Camshaft Position Control Performance Bank 1P25E2A Camshaft Position Control Performance Bank 2P1313A Camshaft Position PlausibilityP000AA Camshaft Position Slow Response Bank 1P000CA Camshaft Position Slow Response Bank 2P001CA Camshaft Profile Actuator A Control Circuit High Bank 1P001FA Camshaft Profile Actuator A Control Circuit High Bank 2P001BA Camshaft Profile Actuator A Control Circuit Low Bank 1P001EA Camshaft Profile Actuator A Control Circuit Low Bank 2P001AA Camshaft Profile Actuator A Control Circuit/Open Bank 1P001DA Camshaft Profile Actuator A Control Circuit/Open Bank 2P003CA Camshaft Profile Actuator A Control Performance/Stuck Off Bank 1P003EA Camshaft Profile Actuator A Control Performance/Stuck Off Bank 2P003DA Camshaft Profile Actuator A Control Stuck On Bank 1P003FA Camshaft Profile Actuator A Control Stuck On Bank 2P2B35A Camshaft Profile Actuator B Control Circuit High Bank 1P2B38A Camshaft Profile Actuator B Control Circuit High Bank 2P2B34A Camshaft Profile Actuator B Control Circuit Low Bank 1P2B37A Camshaft Profile Actuator B Control Circuit Low Bank 2P2B33A Camshaft Profile Actuator B Control Circuit/Open Bank 1P2B36A Camshaft Profile Actuator B Control Circuit/Open Bank 2P2B4FA Camshaft Profile Actuator B Control Performance/Stuck Off Bank 1P2B50A Camshaft Profile Actuator B Control Performance/Stuck Off Bank 2P2B53A Camshaft Profile Actuator B Control Stuck On Bank 1P2B54A Camshaft Profile Actuator B Control Stuck On Bank 2P03EEA Camshaft Profile Actuator C Control Circuit High Bank 1P03EDA Camshaft Profile Actuator C Control Circuit Low Bank 1P03ECA Camshaft Profile Actuator C Control Circuit/Open Bank 1P03EFA Camshaft Profile Actuator C Control Performance/Stuck Off Bank 1P03F0A Camshaft Profile Actuator C Control Stuck On Bank 1P2C05A Camshaft Profile Actuator Position Sensor A Circuit Bank 1P2C08A Camshaft Profile Actuator Position Sensor A Circuit High Bank 1P2C07A Camshaft Profile Actuator Position Sensor A Circuit Low Bank 1P03E9A Camshaft Profile Actuator Position Sensor A Exceeded Learning LimitP2C06A Camshaft Profile Actuator Position Sensor A Range/Performance Bank 1P2C09A Camshaft Profile Actuator Position Sensor B Circuit Bank 1P2C0CA Camshaft Profile Actuator Position Sensor B Circuit High Bank 1P2C0BA Camshaft Profile Actuator Position Sensor B Circuit Low Bank 1P03EAA Camshaft Profile Actuator Position Sensor B Exceeded Learning LimitP2C0AA Camshaft Profile Actuator Position Sensor B Range/Performance Bank 1P2C0DA Camshaft Profile Actuator Position Sensor C Circuit Bank 1P2C10A Camshaft Profile Actuator Position Sensor C Circuit High Bank 1P2C0FA Camshaft Profile Actuator Position Sensor C Circuit Low Bank 1P03EBA Camshaft Profile Actuator Position Sensor C Exceeded Learning LimitP2C0EA Camshaft Profile Actuator Position Sensor C Range/Performance Bank 1P2649A Rocker Arm Actuator Control Circuit High Bank 1P2659A Rocker Arm Actuator Control Circuit High Bank 2P2648A Rocker Arm Actuator Control Circuit Low Bank 1P2658A Rocker Arm Actuator Control Circuit Low Bank 2P2645A Rocker Arm Actuator Control Circuit/Open Bank 1P2655A Rocker Arm Actuator Control Circuit/Open Bank 2P264AA Rocker Arm Actuator Position Sensor Circuit Bank 1P266AA Rocker Arm Actuator Position Sensor Circuit Bank 2P264DA Rocker Arm Actuator Position Sensor Circuit High Bank 1P266DA Rocker Arm Actuator Position Sensor Circuit High Bank 2P264EA Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 1P266EA Rocker Arm Actuator Position Sensor Circuit Intermittent/Erratic Bank 2P264CA Rocker Arm Actuator Position Sensor Circuit Low Bank 1P266CA Rocker Arm Actuator Position Sensor Circuit Low Bank 2P264BA Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 1P266BA Rocker Arm Actuator Position Sensor Circuit Range/Performance Bank 2P2646A Rocker Arm Actuator System Performance/Stuck Off Bank 1P2656A Rocker Arm Actuator System Performance/Stuck Off Bank 2P2647A Rocker Arm Actuator System Stuck On Bank 1P2657A Rocker Arm Actuator System Stuck On Bank 2P1308A/C Clutch Circuit FaultP2CFCA/C Clutch Control CircuitP2CFFA/C Clutch Control Circuit Driver Current/Temperature Too HighP2CFEA/C Clutch Control Circuit HighP2CFDA/C Clutch Control Circuit LowB1969A/C Clutch Magnetic Control Circuit FailureP0645A/C Clutch Relay Control CircuitP0647A/C Clutch Relay Control Circuit HighP0646A/C Clutch Relay Control Circuit LowP1458A/C Compressor Clutch Signal FaultP0D70A/C Compressor Control Module Internal Temperature Sensor A CircuitP0D72A/C Compressor Control Module Internal Temperature Sensor A Circuit HighP0D73A/C Compressor Control Module Internal Temperature Sensor A Circuit LowP0D71A/C Compressor Control Module Internal Temperature Sensor A PerformanceP2E7CA/C Compressor Control Module Internal Temperature Sensor B CircuitP2E7EA/C Compressor Control Module Internal Temperature Sensor B Circuit HighP2E7FA/C Compressor Control Module Internal Temperature Sensor B Circuit LowP2E7DA/C Compressor Control Module Internal Temperature Sensor B PerformanceP0D74A/C Compressor Control Module InternalTemperature Sensor A Circuit Intermittent/ErraticP2E80A/C Compressor Control Module InternalTemperature Sensor B Circuit Intermittent/ErraticP0D75A/C Compressor Control Module Output Driver Temperature Sensor CircuitP0D77A/C Compressor Control Module Output Driver Temperature Sensor Circuit HighP0D79A/C Compressor Control Module Output Driver Temperature Sensor Circuit Intermittent/ErraticP0D78A/C Compressor Control Module Output Driver Temperature Sensor Circuit LowP0D76A/C Compressor Control Module Output Driver Temperature Sensor PerformanceP26FDA/C Compressor Internal Control Module PerformanceP0D6FA/C Compressor Motor Current HighP0EADA/C Compressor Motor Current Sensor CircuitP0EB0A/C Compressor Motor Current Sensor Circuit HighP0EAFA/C Compressor Motor Current Sensor Circuit LowP0EAEA/C Compressor Motor Current Sensor Range/PerformanceP2D44A/C Compressor Motor PerformanceP0D7BA/C Compressor Motor Phase U Current HighP0D7AA/C Compressor Motor Phase U Current LowP0EB1A/C Compressor Motor Phase U Current Sensor CircuitP0EB2A/C Compressor Motor Phase U Current Sensor Circuit HighP0EB3A/C Compressor Motor Phase U Current Sensor Circuit LowP0EB4A/C Compressor Motor Phase U Current Sensor Range/PerformanceP0D7DA/C Compressor Motor Phase V Current HighP0D7CA/C Compressor Motor Phase V Current LowP0EBBA/C Compressor Motor Phase V Current Sensor CircuitP0EB5A/C Compressor Motor Phase V Current Sensor Circuit HighP0EB6A/C Compressor Motor Phase V Current Sensor Circuit LowP0EB7A/C Compressor Motor Phase V Current Sensor Range/PerformanceP0D7FA/C Compressor Motor Phase W Current HighP0D7EA/C Compressor Motor Phase W Current LowP0EC0A/C Compressor Motor Phase W Current Sensor CircuitP0EB8A/C Compressor Motor Phase W Current Sensor Circuit HighP0EB9A/C Compressor Motor Phase W Current Sensor Circuit LowP0EBAA/C Compressor Motor Phase W Current Sensor Range/PerformaceP0EC5A/C Compressor Motor Speed Sensor Range/PerformanceP2D29A/C Compressor Motor StalledP0D6EA/C Compressor Motor Voltage A HighP0D6DA/C Compressor Motor Voltage A LowP2D43A/C Compressor Motor Voltage B HighP2D42A/C Compressor Motor Voltage B LowP2D41A/C Compressor Motor Voltage B PerformanceP0D68A/C Compressor Motor Voltage Sensor A CircuitP0D6AA/C Compressor Motor Voltage Sensor A Circuit HighP0D6CA/C Compressor Motor Voltage Sensor A Circuit Intermittent/ErraticP0D6BA/C Compressor Motor Voltage Sensor A Circuit LowP0D69A/C Compressor Motor Voltage Sensor A PerformanceP0EA8A/C Compressor Motor Voltage Sensor B CircuitP0EAAA/C Compressor Motor Voltage Sensor B Circuit HighP0EACA/C Compressor Motor Voltage Sensor B Circuit Intermittent/ErraticP0EABA/C Compressor Motor Voltage Sensor B Circuit LowP0EA9A/C Compressor Motor Voltage Sensor B Circuit PerformanceB3A10A/C Condenser Efficiency Above ThresholdB3A0FA/C Condenser Efficiency Below ThresholdP2561A/C Control Module Requested MIL IlluminationP1437A/C Evaporator Air Temperature Circuit HighP1436A/C Evaporator Air Temperature Circuit LowP0535A/C Evaporator Temperature Sensor CircuitP0538A/C Evaporator Temperature Sensor Circuit HighP0539A/C Evaporator Temperature Sensor Circuit IntermittentP0537A/C Evaporator Temperature Sensor Circuit LowP0536A/C Evaporator Temperature Sensor Circuit Range/PerformanceP1535A/C High Side Temperature Sensor CircuitB2428A/C Post Heater Sensor #2 Circuit FailureB2429A/C Post Heater Sensor #2 Circuit Short to Ground