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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.

Check soon P · Powertrain 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

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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 1201–1224 of 6682

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P0626Generator Field/F Terminal Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0626 relates to generator field/f terminal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0627Fuel Pump A Control Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP0627 relates to fuel pump a control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0628Fuel Pump A Control Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP0628 relates to fuel pump a control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0629Fuel Pump A Control Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP0629 relates to fuel pump a control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P062AFuel Pump A Control Circuit Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP062A relates to fuel pump a control circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P062BInternal Control Module Fuel Injector Control PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP062B relates to internal control module fuel injector control performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P062CInternal Control Module Vehicle Speed PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP062C relates to internal control module vehicle speed performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P062DFuel Injector Driver Circuit Performance Bank 1Check soonFuel System30–120 minutes for initial diagnosisP062D relates to fuel injector driver circuit performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P062EFuel Injector Driver Circuit Performance Bank 2Check soonFuel System30–120 minutes for initial diagnosisP062E relates to fuel injector driver circuit performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P062FInternal Control Module EEPROM ErrorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP062F relates to internal control module eeprom error. Check the fault conditions and vehicle-specific procedure before replacing parts.P0630VIN Not Programmed or Incompatible - ECM/PCMCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0630 relates to vin not programmed or incompatible - ecm/pcm. Check the fault conditions and vehicle-specific procedure before replacing parts.P0631VIN Not Programmed or Incompatible - TCMCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0631 relates to vin not programmed or incompatible - tcm. Check the fault conditions and vehicle-specific procedure before replacing parts.P0632Odometer Not Programmed - ECM/PCMCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0632 relates to odometer not programmed - ecm/pcm. Check the fault conditions and vehicle-specific procedure before replacing parts.P0633Immobilizer Key Not Programmed - ECM/PCMCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0633 relates to immobilizer key not programmed - ecm/pcm. Check the fault conditions and vehicle-specific procedure before replacing parts.P0634Control Module Internal Temperature A Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0634 relates to control module internal temperature a too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0635Power Steering Control CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0635 relates to power steering control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0636Power Steering Control Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0636 relates to power steering control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0637Power Steering Control Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0637 relates to power steering control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0638Throttle Actuator Control Range/Performance Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0638 relates to throttle actuator control range/performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0639Throttle Actuator Control Range/Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0639 relates to throttle actuator control range/performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P063AGenerator Voltage Sense Circuit ACheck soonElectrical & Charging System30–120 minutes for initial diagnosisP063A relates to generator voltage sense circuit a. Check the fault conditions and vehicle-specific procedure before replacing parts.P063BGenerator Voltage Sense Circuit A Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP063B relates to generator voltage sense circuit a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P063CGenerator Voltage Sense Circuit A LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP063C relates to generator voltage sense circuit a low. Check the fault conditions and vehicle-specific procedure before replacing parts.P063DGenerator Voltage Sense Circuit A HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP063D relates to generator voltage sense circuit a high. Check the fault conditions and vehicle-specific procedure before replacing parts.