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.

P · Powertrain 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 1513–1536 of 7353

Most searched first

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.P069DCylinder 10 Glow Plug Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP069D relates to cylinder 10 glow plug control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P069EFuel Pump Control Module Requested MIL IlluminationCheck soonFuel System30–120 minutes for initial diagnosisP069E relates to fuel pump control module requested mil illumination. Check the fault conditions and vehicle-specific procedure before replacing parts.P069FThrottle Actuator Control Lamp Control CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP069F relates to throttle actuator control lamp control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A0Variable A/C Compressor Control CircuitLow prioritySensors & Electronics30–120 minutes for initial diagnosisP06A0 relates to variable a/c compressor control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.