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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 1–24 of 1797

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P005ETurbocharger/Supercharger Boost Control B Supply Voltage Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP005E relates to turbocharger/supercharger boost control b supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P005FTurbocharger/Supercharger Boost Control B Supply Voltage Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP005F relates to turbocharger/supercharger boost control b supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P006ETurbocharger/Supercharger Boost Control A Supply Voltage Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP006E relates to turbocharger/supercharger boost control a supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P006FTurbocharger/Supercharger Boost Control A Supply Voltage Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP006F relates to turbocharger/supercharger boost control a supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P00FDBattery B State of Charge PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP00FD relates to battery b state of charge performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F2O2 Sensor Circuit Low Voltage Bank 1 Sensor 4Check soonElectrical & Charging System30–120 minutes for initial diagnosisP01F2 relates to o2 sensor circuit low voltage bank 1 sensor 4. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F3O2 Sensor Circuit High Voltage Bank 1 Sensor 4Check soonElectrical & Charging System30–120 minutes for initial diagnosisP01F3 relates to o2 sensor circuit high voltage bank 1 sensor 4. Check the fault conditions and vehicle-specific procedure before replacing parts.P0512Starter Request CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0512 indicates a fault related to starter request circuit. Learn the likely causes and a practical diagnostic order before replacing parts.P0513Incorrect Immobilizer KeyCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0513 indicates a fault related to incorrect immobilizer key. Learn the likely causes and a practical diagnostic order before replacing parts.P0514Battery Temperature Sensor Circuit Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0514 indicates a fault related to battery temperature sensor circuit range/performance. Learn the likely causes and a practical diagnostic order before replacing parts.P0515Battery Temperature Sensor CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0515 indicates a fault related to battery temperature sensor circuit. Learn the likely causes and a practical diagnostic order before replacing parts.P0516Battery Temperature Sensor Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0516 indicates a fault related to battery temperature sensor circuit low. Learn the likely causes and a practical diagnostic order before replacing parts.P0517Battery Temperature Sensor Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0517 indicates a fault related to battery temperature sensor circuit high. Learn the likely causes and a practical diagnostic order before replacing parts.P052FGlow Plug Control Module 1 System VoltageCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP052F relates to glow plug control module 1 system voltage. Check the fault conditions and vehicle-specific procedure before replacing parts.P0540Intake Air Heater A CircuitCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0540 indicates a fault related to intake air heater a circuit. Learn the likely causes and a practical diagnostic order before replacing parts.P0541Intake Air Heater A Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0541 indicates a fault related to intake air heater a circuit low. Learn the likely causes and a practical diagnostic order before replacing parts.P0542Intake Air Heater A Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0542 indicates a fault related to intake air heater a circuit high. Learn the likely causes and a practical diagnostic order before replacing parts.P0543Intake Air Heater A Circuit OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0543 indicates a fault related to intake air heater a circuit open. Learn the likely causes and a practical diagnostic order before replacing parts.P0560System Voltage MalfunctionElectrical & Charging SystemFix P0560 system voltage malfunction code - battery, alternator, and wiring causes explained.P0561System Voltage UnstableCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP0561 indicates a fault related to system voltage unstable. Learn the likely causes and a practical diagnostic order before replacing parts.P0562System Voltage LowElectrical & Charging SystemFix P0562 system voltage low code. Learn what causes low charging voltage and how to test the battery and alternator.P0563System Voltage HighUrgentElectrical & Charging System1–3 hours for initial diagnosisP0563 means System Voltage High. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P056DReductant Control Module System VoltageCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP056D relates to reductant control module system voltage. Check the fault conditions and vehicle-specific procedure before replacing parts.P057FBattery A State of Charge PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP057F relates to battery a state of charge performance. Check the fault conditions and vehicle-specific procedure before replacing parts.