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.

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 4801–4824 of 7353

Most searched first

P24FCParticulate Matter Sensor Heater Control Circuit Driver Current/Temperature Too HighCheck soonEmissions System30–120 minutes for initial diagnosisP24FC relates to particulate matter sensor heater control circuit driver current/temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P24FDParticulate Filter A IncorrectCheck soonEmissions System30–120 minutes for initial diagnosisP24FD relates to particulate filter a incorrect. Check the fault conditions and vehicle-specific procedure before replacing parts.P24FESCR Catalyst IncorrectCheck soonEmissions System30–120 minutes for initial diagnosisP24FE relates to scr catalyst incorrect. Check the fault conditions and vehicle-specific procedure before replacing parts.P24FFReductant Temperature Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP24FF relates to reductant temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2500Generator Lamp/L-Terminal Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2500 relates to generator lamp/l-terminal circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2501Generator Lamp/L-Terminal Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2501 relates to generator lamp/l-terminal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2502Charging System VoltageCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2502 relates to charging system voltage. Check the fault conditions and vehicle-specific procedure before replacing parts.P2503Charging System Voltage LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2503 relates to charging system voltage low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2504Charging System Voltage HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2504 relates to charging system voltage high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2505ECM/PCM Power Input SignalCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2505 relates to ecm/pcm power input signal. Check the fault conditions and vehicle-specific procedure before replacing parts.P2506ECM/PCM Power Input Signal Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2506 relates to ecm/pcm power input signal range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2507ECM/PCM Power Input Signal LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2507 relates to ecm/pcm power input signal low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2508ECM/PCM Power Input Signal HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2508 relates to ecm/pcm power input signal high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2509ECM/PCM Power Input Signal IntermittentCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2509 relates to ecm/pcm power input signal intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P250AEngine Oil Level Sensor CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP250A relates to engine oil level sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P250BEngine Oil Level Sensor Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP250B relates to engine oil level sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P250CEngine Oil Level Sensor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP250C relates to engine oil level sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P250DEngine Oil Level Sensor Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP250D relates to engine oil level sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P250EEngine Oil Level Sensor Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP250E relates to engine oil level sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P250FEngine Oil Level Too LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP250F relates to engine oil level too low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2510ECM/PCM Power Relay Sense Circuit Range/PerformanceCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2510 relates to ecm/pcm power relay sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2511ECM/PCM Power Relay Sense Circuit IntermittentCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP2511 relates to ecm/pcm power relay sense circuit intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P2512Event Data Recorder Request Circuit/ OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2512 relates to event data recorder request circuit/ open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2513Event Data Recorder Request Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2513 relates to event data recorder request circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.