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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

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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 481–504 of 1939

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P064EInternal Control Module O2 Sensor Processor Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP064E relates to internal control module o2 sensor processor performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P064FUnauthorized Software/Calibration DetectedCheck soonSensors & Electronics30–120 minutes for initial diagnosisP064F relates to unauthorized software/calibration detected. Check the fault conditions and vehicle-specific procedure before replacing parts.P0650MIL Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0650 relates to mil control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0654Engine RPM Output Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0654 relates to engine rpm output circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0655Engine Hot Lamp Output Control CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0655 relates to engine hot lamp output control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P065DReductant System Malfunction Lamp Control CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP065D relates to reductant system malfunction lamp control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P065EIntake Manifold Tuning Valve Performance Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP065E relates to intake manifold tuning valve performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P065FIntake Manifold Tuning Valve Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP065F relates to intake manifold tuning valve performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0660Intake Manifold Tuning Valve Control Circuit/Open Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0660 relates to intake manifold tuning valve control circuit/open bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0661Intake Manifold Tuning Valve Control Circuit Low Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0661 relates to intake manifold tuning valve control circuit low bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0662Intake Manifold Tuning Valve Control Circuit High Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0662 relates to intake manifold tuning valve control circuit high bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0663Intake Manifold Tuning Valve Control Circuit/Open Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0663 relates to intake manifold tuning valve control circuit/open bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0664Intake Manifold Tuning Valve Control Circuit Low Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0664 relates to intake manifold tuning valve control circuit low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0665Intake Manifold Tuning Valve Control Circuit High Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0665 relates to intake manifold tuning valve control circuit high bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0666Control Module Internal Temperature Sensor A CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0666 relates to control module internal temperature sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0667Control Module Internal Temperature Sensor A Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0667 relates to control module internal temperature sensor a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P0668Control Module Internal Temperature Sensor A Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0668 relates to control module internal temperature sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0669Control Module Internal Temperature Sensor A Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0669 relates to control module internal temperature sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0670Glow Plug Control Module 1 Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0670 relates to glow plug control module 1 control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0683Glow Plug Control Module 1 to PCM Communication CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0683 relates to glow plug control module 1 to pcm communication circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0684Glow Plug Control Module 1 to PCM Communication Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0684 relates to glow plug control module 1 to pcm communication circuit range/performance. 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.P06AAControl Module Internal Temperature B Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AA relates to control module internal temperature b too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06ABControl Module Internal Temperature Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AB relates to control module internal temperature sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.