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9,253 diagnostic guides

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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 Clear all

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

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Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

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

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

Diagnostic codes

Showing 1513–1536 of 1797

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P2AF2Starter Relay C Control Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF2 relates to starter relay c control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF3Starter Relay C Control Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF3 relates to starter relay c control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF4Starter Relay C Control Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF4 relates to starter relay c control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF5Starter Relay C Stuck OnCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF5 relates to starter relay c stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF6Starter Relay C Stuck OffCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF6 relates to starter relay c stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF7Starter Relay D Control Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF7 relates to starter relay d control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF8Starter Relay D Control Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF8 relates to starter relay d control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AF9Starter Relay D Control Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AF9 relates to starter relay d control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AFAStarter Relay D Stuck OnCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AFA relates to starter relay d stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P2AFBStarter Relay D Stuck OffCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2AFB relates to starter relay d stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B28Hybrid/EV Battery Pack Coolant Pump A PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2B28 relates to hybrid/ev battery pack coolant pump a performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B29Hybrid/EV Battery Pack Coolant Pump A Overspeed - Dry RunUrgentElectrical & Charging System30–120 minutes for initial diagnosisP2B29 relates to hybrid/ev battery pack coolant pump a overspeed - dry run. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B62Coolant Pump B Supply Voltage CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2B62 relates to coolant pump b supply voltage circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B69Coolant Pump D Supply Voltage CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2B69 relates to coolant pump d supply voltage circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B89Intake Air O2 Sensor Circuit Low Voltage Bank 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2B89 relates to intake air o2 sensor circuit low voltage bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B8AIntake Air O2 Sensor Circuit High Voltage Bank 1Check soonElectrical & Charging System30–120 minutes for initial diagnosisP2B8A relates to intake air o2 sensor circuit high voltage bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2B9DCoolant Pump A Supply Voltage CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2B9D relates to coolant pump a supply voltage circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BA3Starter/Generator Mechanical PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BA3 relates to starter/generator mechanical performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BBFTurbocharger/Supercharger Bypass Valve A Supply Voltage LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BBF relates to turbocharger/supercharger bypass valve a supply voltage low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BC2Charge Air Cooler Coolant Pump A Supply Voltage CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BC2 relates to charge air cooler coolant pump a supply voltage circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BC4Battery Charging System Positive Contactor B CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BC4 relates to battery charging system positive contactor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BC5Battery Charging System Positive Contactor B Stuck ClosedCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BC5 relates to battery charging system positive contactor b stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BC6Battery Charging System Positive Contactor B Stuck OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BC6 relates to battery charging system positive contactor b stuck open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2BC7Battery Charging System Positive Contactor B Control Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2BC7 relates to battery charging system positive contactor b control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.