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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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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 73–96 of 1797

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P0685ECM/PCM Power Relay Control Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0685 relates to ecm/pcm power relay control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0686ECM/PCM Power Relay Control Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0686 relates to ecm/pcm power relay control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0687ECM/PCM Power Relay Control Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0687 relates to ecm/pcm power relay control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0688ECM/PCM Power Relay Sense Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0688 relates to ecm/pcm power relay sense circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0689ECM/PCM Power Relay Sense Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0689 relates to ecm/pcm power relay sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P068AECM/PCM Power Relay De-Energized Performance - Too EarlyCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP068A relates to ecm/pcm power relay de-energized performance - too early. Check the fault conditions and vehicle-specific procedure before replacing parts.P068BECM/PCM Power Relay De-Energized Performance - Too LateCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP068B relates to ecm/pcm power relay de-energized performance - too late. Check the fault conditions and vehicle-specific procedure before replacing parts.P0690ECM/PCM Power Relay Sense Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0690 relates to ecm/pcm power relay sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0697Sensor Reference Voltage C Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0697 relates to sensor reference voltage c circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0698Sensor Reference Voltage C Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0698 relates to sensor reference voltage c circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0699Sensor Reference Voltage C Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0699 relates to sensor reference voltage c circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A3Sensor Reference Voltage D Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A3 relates to sensor reference voltage d circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A4Sensor Reference Voltage D Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A4 relates to sensor reference voltage d circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A5Sensor Reference Voltage D Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A5 relates to sensor reference voltage d circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A6Sensor Reference Voltage A Circuit Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A6 relates to sensor reference voltage a circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A7Sensor Reference Voltage B Circuit Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A7 relates to sensor reference voltage b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A8Sensor Reference Voltage C Circuit Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A8 relates to sensor reference voltage c circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A9Sensor Reference Voltage D Circuit Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06A9 relates to sensor reference voltage d circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B0Sensor Power Supply A Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06B0 relates to sensor power supply a circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B1Sensor Power Supply A Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06B1 relates to sensor power supply a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B2Sensor Power Supply A Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06B2 relates to sensor power supply a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B3Sensor Power Supply B Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06B3 relates to sensor power supply b circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B4Sensor Power Supply B Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06B4 relates to sensor power supply b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B5Sensor Power Supply B Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP06B5 relates to sensor power supply b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.