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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 1489–1512 of 8256

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P05ECCold Start Injection Timing PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP05EC relates to cold start injection timing performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EDReductant Heater Control Module Supply VoltageCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05ED relates to reductant heater control module supply voltage. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EEReductant Pump Supply Voltage Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05EE relates to reductant pump supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EFReductant Pump Supply Voltage Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05EF relates to reductant pump supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F0Reductant Pump Supply Voltage Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F0 relates to reductant pump supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F1Reductant Pump Supply Voltage Circuit Stuck OnCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F1 relates to reductant pump supply voltage circuit stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F2Reductant Pump Supply Voltage Circuit Stuck OffCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F2 relates to reductant pump supply voltage circuit stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F3Exhaust Aftertreatment Power Relay Control Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F3 relates to exhaust aftertreatment power relay control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F4Exhaust Aftertreatment Power Relay Control Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F4 relates to exhaust aftertreatment power relay control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F5Exhaust Aftertreatment Power Relay Control Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F5 relates to exhaust aftertreatment power relay control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F6Exhaust Aftertreatment Power Relay Control Circuit Stuck OnCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F6 relates to exhaust aftertreatment power relay control circuit stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F7Exhaust Aftertreatment Power Relay Control Circuit Stuck OffCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F7 relates to exhaust aftertreatment power relay control circuit stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F8Reductant Heater Control Module PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05F8 relates to reductant heater control module performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F9Stop-Start Status Signal CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05F9 relates to stop-start status signal circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P05FAStop-Start Status Signal Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05FA relates to stop-start status signal circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05FBStop-Start Status Signal Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05FB relates to stop-start status signal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05FCCold Start Fuel Pressure Performance Bank 2Check soonFuel System30–120 minutes for initial diagnosisP05FC relates to cold start fuel pressure performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P05FDTurbocharger/Supercharger Boost Control A Temperature Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05FD relates to turbocharger/supercharger boost control a temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05FEActive Grille Air Shutter C Performance/Stuck OffCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05FE relates to active grille air shutter c performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P05FFBrake Pressure Sensor / Brake Pedal Position Sensor CorrelationCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05FF relates to brake pressure sensor / brake pedal position sensor correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P0600Serial Communication Link MalfunctionCheck soonElectrical & Charging System45–120 minutes for initial diagnosisP0600 means Serial Communication Link Malfunction. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0601Internal Control Module Memory Checksum ErrorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0601 relates to internal control module memory checksum error. Check the fault conditions and vehicle-specific procedure before replacing parts.P0602Control Module Programming ErrorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0602 relates to control module programming error. Check the fault conditions and vehicle-specific procedure before replacing parts.P0603Internal Control Module Keep Alive Memory (KAM) ErrorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0603 relates to internal control module keep alive memory (kam) error. Check the fault conditions and vehicle-specific procedure before replacing parts.