Diagnostic library

Find an OBD2 code

Search the code from your scanner, then narrow the library by system, severity, or code family.

9,253 diagnostic guides

Sort

Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh gear changesDelayed or rough shifting

A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.

Electrical & Charging System Check soon Clear all

Quick browse

Choose a vehicle system

Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

FiltersSeverity · family

Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

Vehicle coverage

These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 1273–1296 of 1570

Most searched first

P26F3Starter Relay B Stuck OffCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP26F3 relates to starter relay b stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P26F7Coolant Pump C Supply Voltage CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP26F7 relates to coolant pump c supply voltage circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28C0Ion Sense Module Supply Voltage CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP28C0 relates to ion sense module supply voltage circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28C1Ion Sense Module Supply Voltage LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP28C1 relates to ion sense module supply voltage low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28C2Ion Sense Module Supply Voltage HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP28C2 relates to ion sense module supply voltage high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A06O2 Sensor Negative Voltage Bank 1 Sensor 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2A06 relates to o2 sensor negative voltage bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A07O2 Sensor Negative Voltage Bank 1 Sensor 2Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2A07 relates to o2 sensor negative voltage bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A08O2 Sensor Negative Voltage Bank 1 Sensor 3Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2A08 relates to o2 sensor negative voltage bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A09O2 Sensor Negative Voltage Bank 2 Sensor 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2A09 relates to o2 sensor negative voltage bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A10O2 Sensor Negative Voltage Bank 2 Sensor 2Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2A10 relates to o2 sensor negative voltage bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A11O2 Sensor Negative Voltage Bank 2 Sensor 3Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2A11 relates to o2 sensor negative voltage bank 2 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A32AFCM Power Relay Control Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2A32 relates to afcm power relay control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A33AFCM Power Relay Control Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2A33 relates to afcm power relay control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A34AFCM Power Relay Control Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2A34 relates to afcm power relay control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A35AFCM Power Relay Sense CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2A35 relates to afcm power relay sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A36AFCM Power Relay Sense Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2A36 relates to afcm power relay sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A37AFCM Power Relay Sense Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2A37 relates to afcm power relay sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2ABFIntake Air O2 Sensor Reference Voltage Circuit/Open Bank 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2ABF relates to intake air o2 sensor reference voltage circuit/open bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AC0Intake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2AC0 relates to intake air o2 sensor reference voltage circuit range/performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AC1Intake Air O2 Sensor Reference Voltage Circuit Low Bank 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2AC1 relates to intake air o2 sensor reference voltage circuit low bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AC2Intake Air O2 Sensor Reference Voltage Circuit High Bank 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2AC2 relates to intake air o2 sensor reference voltage circuit high bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AC3Intake Air O2 Sensor Reference Voltage Circuit/Open Bank 2Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2AC3 relates to intake air o2 sensor reference voltage circuit/open bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AC4Intake Air O2 Sensor Reference Voltage Circuit Range/Performance Bank 2Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2AC4 relates to intake air o2 sensor reference voltage circuit range/performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AC5Intake Air O2 Sensor Reference Voltage Circuit Low Bank 2Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2AC5 relates to intake air o2 sensor reference voltage circuit low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.