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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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Severity

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 193–216 of 1939

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P025FTurbocharger/Supercharger Boost Sensor B Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP025F relates to turbocharger/supercharger boost sensor b intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P026ACharge Air Cooler Efficiency Below ThresholdCheck soonSensors & Electronics30–120 minutes for initial diagnosisP026A relates to charge air cooler efficiency below threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P02CATurbocharger/Supercharger B Overboost ConditionCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02CA relates to turbocharger/supercharger b overboost condition. Check the fault conditions and vehicle-specific procedure before replacing parts.P02CBTurbocharger/Supercharger B Underboost ConditionCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02CB relates to turbocharger/supercharger b underboost condition. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E0Diesel Intake Air Flow A Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E0 relates to diesel intake air flow a control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E1Diesel Intake Air Flow A Control PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E1 relates to diesel intake air flow a control performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E2Diesel Intake Air Flow A Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E2 relates to diesel intake air flow a control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E3Diesel Intake Air Flow A Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E3 relates to diesel intake air flow a control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E4Diesel Intake Air Flow A Control Stuck OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E4 relates to diesel intake air flow a control stuck open. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E5Diesel Intake Air Flow A Control Stuck ClosedCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E5 relates to diesel intake air flow a control stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E6Diesel Intake Air Flow A Position Sensor CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E6 relates to diesel intake air flow a position sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E7Diesel Intake Air Flow A Position Sensor Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E7 relates to diesel intake air flow a position sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E8Diesel Intake Air Flow A Position Sensor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E8 relates to diesel intake air flow a position sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P02E9Diesel Intake Air Flow A Position Sensor Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02E9 relates to diesel intake air flow a position sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P02EADiesel Intake Air Flow A Position Sensor Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02EA relates to diesel intake air flow a position sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P02EBDiesel Intake Air Flow A Control Motor Current Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02EB relates to diesel intake air flow a control motor current range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P02ECDiesel Intake Air Flow A Control System - High Air Flow DetectedCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02EC relates to diesel intake air flow a control system - high air flow detected. Check the fault conditions and vehicle-specific procedure before replacing parts.P02EDDiesel Intake Air Flow A Control System - Low Air Flow DetectedCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02ED relates to diesel intake air flow a control system - low air flow detected. Check the fault conditions and vehicle-specific procedure before replacing parts.P02FADiesel Intake Air Flow Position Sensor Minimum/Maximum Stop PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02FA relates to diesel intake air flow position sensor minimum/maximum stop performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P02FFPropulsion System Inactive Timer PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02FF relates to propulsion system inactive timer performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P030AIgnition A Control Signal Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP030A relates to ignition a control signal circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P030BIgnition A Control Signal Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP030B relates to ignition a control signal circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P030CIgnition A Control Signal Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP030C relates to ignition a control signal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P030DIgnition B Control Signal Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP030D relates to ignition b control signal circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.