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.

Sensors & Electronics P · Powertrain 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 2017–2040 of 2110

Most searched first

P2E9FCharge Port Door B Unlock Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2E9F relates to charge port door b unlock control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EA0Charge Port Door B Unlock Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EA0 relates to charge port door b unlock control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EA6Turbocharger Compressor Outlet Temperature Sensor CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EA6 relates to turbocharger compressor outlet temperature sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EA9DC/AC Converter A Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP2EA9 relates to dc/ac converter a over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EAAActive Radiator Air Flow Control Module A Control Circuit PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EAA relates to active radiator air flow control module a control circuit performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EABActive Radiator Air Flow Control Module A Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP2EAB relates to active radiator air flow control module a over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EACActive Radiator Air Flow Control Module A PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EAC relates to active radiator air flow control module a performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EADReductant Metering Unit 2 PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EAD relates to reductant metering unit 2 performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EB0Throttle Valve Intake Air Pressure Sensor CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EB0 relates to throttle valve intake air pressure sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EB1Throttle Valve Intake Air Pressure Sensor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EB1 relates to throttle valve intake air pressure sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EB2Throttle Valve Intake Air Pressure Sensor Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EB2 relates to throttle valve intake air pressure sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EB3Throttle Valve Intake Air Pressure Sensor Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EB3 relates to throttle valve intake air pressure sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EBBCrankcase Temperature Sensor CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EBB relates to crankcase temperature sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EBCCrankcase Temperature Sensor Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EBC relates to crankcase temperature sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EBDCrankcase Temperature Sensor Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EBD relates to crankcase temperature sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EBECrankcase Temperature Sensor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EBE relates to crankcase temperature sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EC0Turbocharger Compressor Outlet Temperature Sensor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EC0 relates to turbocharger compressor outlet temperature sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EC1Turbocharger Compressor Outlet Temperature Sensor Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EC1 relates to turbocharger compressor outlet temperature sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2EC2Turbocharger Compressor Outlet Temperature Sensor Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2EC2 relates to turbocharger compressor outlet temperature sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P340ADeactivation/Intake Valve Control Circuit Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP340A relates to deactivation/intake valve control circuit bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P340BDeactivation/Intake Valve Control Circuit Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP340B relates to deactivation/intake valve control circuit bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P340CDeactivation/Exhaust Valve Control Circuit Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP340C relates to deactivation/exhaust valve control circuit bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P340DDeactivation/Exhaust Valve Control Circuit Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP340D relates to deactivation/exhaust valve control circuit bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P341ADeactivation/Intake Valve Control Circuit Performance Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP341A relates to deactivation/intake valve control circuit performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.