Diagnostic library

Find an OBD2 code

Search the code from your scanner, then narrow the library by system, severity, or code family.

9,253 diagnostic guides

Sort

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 Clear all

Quick browse

Choose a vehicle system

Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

FiltersSeverity · family

Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

Vehicle coverage

These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 5257–5280 of 8256

Most searched first

P2795Gear Shift Direction Circuit HighCheck soonTransmission Issues30–120 minutes for initial diagnosisP2795 relates to gear shift direction circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2796Electric/Auxiliary Transmission Fluid Pump A Control Circuit/OpenCheck soonTransmission Issues30–120 minutes for initial diagnosisP2796 relates to electric/auxiliary transmission fluid pump a control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2797Electric/Auxiliary Transmission Fluid Pump A Performance/Stuck OffCheck soonTransmission Issues30–120 minutes for initial diagnosisP2797 relates to electric/auxiliary transmission fluid pump a performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P2798Electric/Auxiliary Transmission Fluid Pump A Control Circuit LowCheck soonTransmission Issues30–120 minutes for initial diagnosisP2798 relates to electric/auxiliary transmission fluid pump a control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2799Electric/Auxiliary Transmission Fluid Pump A Control Circuit HighCheck soonTransmission Issues30–120 minutes for initial diagnosisP2799 relates to electric/auxiliary transmission fluid pump a control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P279ATransfer Case Gear High Incorrect RatioCheck soonTransmission Issues30–120 minutes for initial diagnosisP279A relates to transfer case gear high incorrect ratio. Check the fault conditions and vehicle-specific procedure before replacing parts.P279BTransfer Case Gear Low Incorrect RatioCheck soonTransmission Issues30–120 minutes for initial diagnosisP279B relates to transfer case gear low incorrect ratio. Check the fault conditions and vehicle-specific procedure before replacing parts.P279CTransfer Case Gear Neutral Incorrect RatioCheck soonTransmission Issues30–120 minutes for initial diagnosisP279C relates to transfer case gear neutral incorrect ratio. Check the fault conditions and vehicle-specific procedure before replacing parts.P279DFour Wheel Drive (4WD) Range Signal CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP279D relates to four wheel drive (4wd) range signal circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P279EFour Wheel Drive (4WD) Range Signal Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP279E relates to four wheel drive (4wd) range signal circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P279FFour Wheel Drive (4WD) Range Signal Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP279F relates to four wheel drive (4wd) range signal circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A0Four Wheel Drive (4WD) Range Signal Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP27A0 relates to four wheel drive (4wd) range signal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A1Electric/Auxiliary Transmission Fluid Pump A Stuck OnCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A1 relates to electric/auxiliary transmission fluid pump a stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A2Electric/Auxiliary Transmission Fluid Pump B Control Circuit/OpenCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A2 relates to electric/auxiliary transmission fluid pump b control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A3Electric/Auxiliary Transmission Fluid Pump B Performance/Stuck OffCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A3 relates to electric/auxiliary transmission fluid pump b performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A4Electric/Auxiliary Transmission Fluid Pump B Control Circuit LowCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A4 relates to electric/auxiliary transmission fluid pump b control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A5Electric/Auxiliary Transmission Fluid Pump B Control Circuit HighCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A5 relates to electric/auxiliary transmission fluid pump b control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A6Electric/Auxiliary Transmission Fluid Pump B Stuck OnCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A6 relates to electric/auxiliary transmission fluid pump b stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A7Pressure Control Solenoid A Data IncompatibleCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A7 relates to pressure control solenoid a data incompatible. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A8Pressure Control Solenoid B Data IncompatibleCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A8 relates to pressure control solenoid b data incompatible. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A9Pressure Control Solenoid C Data IncompatibleCheck soonTransmission Issues30–120 minutes for initial diagnosisP27A9 relates to pressure control solenoid c data incompatible. Check the fault conditions and vehicle-specific procedure before replacing parts.P27AAPressure Control Solenoid D Data IncompatibleCheck soonTransmission Issues30–120 minutes for initial diagnosisP27AA relates to pressure control solenoid d data incompatible. Check the fault conditions and vehicle-specific procedure before replacing parts.P27ABPressure Control Solenoid E Data IncompatibleCheck soonTransmission Issues30–120 minutes for initial diagnosisP27AB relates to pressure control solenoid e data incompatible. Check the fault conditions and vehicle-specific procedure before replacing parts.P27ACPressure Control Solenoid F Data IncompatibleCheck soonTransmission Issues30–120 minutes for initial diagnosisP27AC relates to pressure control solenoid f data incompatible. Check the fault conditions and vehicle-specific procedure before replacing parts.