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.

Emissions System 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 409–432 of 515

Most searched first

P24D5EVAP System Pressure Sensor/Switch B CircuitLow priorityEmissions System30–120 minutes for initial diagnosisP24D5 relates to evap system pressure sensor/switch b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P24D6EVAP System Pressure Sensor/Switch B Circuit Range/PerformanceLow priorityEmissions System30–120 minutes for initial diagnosisP24D6 relates to evap system pressure sensor/switch b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P24D7EVAP System Pressure Sensor/Switch B Circuit LowLow priorityEmissions System30–120 minutes for initial diagnosisP24D7 relates to evap system pressure sensor/switch b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P24D8EVAP System Pressure Sensor/Switch B Circuit HighLow priorityEmissions System30–120 minutes for initial diagnosisP24D8 relates to evap system pressure sensor/switch b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P24D9EVAP System Pressure Sensor/Switch B Circuit IntermittentLow priorityEmissions System30–120 minutes for initial diagnosisP24D9 relates to evap system pressure sensor/switch b circuit intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P24DAParticulate Matter Sensor Exhaust Sample Error Bank 1Check soonEmissions System30–120 minutes for initial diagnosisP24DA relates to particulate matter sensor exhaust sample error bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P24DBReductant Purge Control Valve B Circuit /OpenCheck soonEmissions System30–120 minutes for initial diagnosisP24DB relates to reductant purge control valve b circuit /open. Check the fault conditions and vehicle-specific procedure before replacing parts.P24DCReductant Purge Control Valve B PerformanceCheck soonEmissions System30–120 minutes for initial diagnosisP24DC relates to reductant purge control valve b performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P24DDReductant Purge Control Valve B Circuit LowCheck soonEmissions System30–120 minutes for initial diagnosisP24DD relates to reductant purge control valve b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P24DEReductant Purge Control Valve B Circuit HighCheck soonEmissions System30–120 minutes for initial diagnosisP24DE relates to reductant purge control valve b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P24DFReductant Purge Control Valve B Stuck OpenCheck soonEmissions System30–120 minutes for initial diagnosisP24DF relates to reductant purge control valve b stuck open. Check the fault conditions and vehicle-specific procedure before replacing parts.P24E0Reductant Purge Control Valve B Stuck ClosedCheck soonEmissions System30–120 minutes for initial diagnosisP24E0 relates to reductant purge control valve b stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P24F2EGR Temperature/Charge Air Cooler Temperature CorrelationCheck soonEmissions System30–120 minutes for initial diagnosisP24F2 relates to egr temperature/charge air cooler temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P24F6Exhaust Aftertreatment Fuel Air Purge Valve Stuck OpenCheck soonEmissions System30–120 minutes for initial diagnosisP24F6 relates to exhaust aftertreatment fuel air purge valve stuck open. Check the fault conditions and vehicle-specific procedure before replacing parts.P24F7Exhaust Aftertreatment Fuel Air Purge Valve Stuck ClosedCheck soonEmissions System30–120 minutes for initial diagnosisP24F7 relates to exhaust aftertreatment fuel air purge valve stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P24F8Exhaust Aftertreatment Fuel Air Purge Valve Control CircuitCheck soonEmissions System30–120 minutes for initial diagnosisP24F8 relates to exhaust aftertreatment fuel air purge valve control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P24F9Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Range/PerformanceCheck soonEmissions System30–120 minutes for initial diagnosisP24F9 relates to exhaust aftertreatment fuel air purge valve control circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P24FAExhaust Aftertreatment Fuel Air Purge Valve Control Circuit LowCheck soonEmissions System30–120 minutes for initial diagnosisP24FA relates to exhaust aftertreatment fuel air purge valve control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P24FBExhaust Aftertreatment Fuel Air Purge Valve Control Circuit HighCheck soonEmissions System30–120 minutes for initial diagnosisP24FB relates to exhaust aftertreatment fuel air purge valve control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.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.P2567Direct Ozone Reduction Catalyst Temperature Sensor CircuitCheck soonEmissions System30–120 minutes for initial diagnosisP2567 relates to direct ozone reduction catalyst temperature sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2568Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/PerformanceCheck soonEmissions System30–120 minutes for initial diagnosisP2568 relates to direct ozone reduction catalyst temperature sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.