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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.

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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 1633–1656 of 8256

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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.P068CCylinder 7 Glow Plug Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP068C relates to cylinder 7 glow plug control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P068DCylinder 7 Glow Plug Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP068D relates to cylinder 7 glow plug control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P068ECylinder 8 Glow Plug Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP068E relates to cylinder 8 glow plug control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P068FCylinder 8 Glow Plug Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP068F relates to cylinder 8 glow plug control circuit high. 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.P0691Fan 1 Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP0691 relates to fan 1 control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0692Fan 1 Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP0692 relates to fan 1 control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0693Fan 2 Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP0693 relates to fan 2 control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0694Fan 2 Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP0694 relates to fan 2 control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0695Fan 3 Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP0695 relates to fan 3 control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0696Fan 3 Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP0696 relates to fan 3 control 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.P069ACylinder 9 Glow Plug Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP069A relates to cylinder 9 glow plug control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P069BCylinder 9 Glow Plug Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP069B relates to cylinder 9 glow plug control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P069CCylinder 10 Glow Plug Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP069C relates to cylinder 10 glow plug control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.