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.

Low priority 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 49–72 of 298

Most searched first

P0458EVAP System Purge Control Valve A Circuit LowLow priorityEmissions System30–120 minutes for initial diagnosisP0458 relates to evap system purge control valve a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0459EVAP System Purge Control Valve A Circuit HighLow priorityEmissions System30–120 minutes for initial diagnosisP0459 relates to evap system purge control valve a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0460Fuel Level Sensor Circuit MalfunctionLow priorityFuel System30–120 minutes for initial diagnosisP0460 indicates a fault related to fuel level sensor circuit malfunction. Learn the likely causes and a practical diagnostic order before replacing parts.P0461Fuel Level Sensor Circuit Range/PerformanceLow priorityFuel System30–120 minutes for initial diagnosisP0461 indicates a fault related to fuel level sensor circuit range/performance. Learn the likely causes and a practical diagnostic order before replacing parts.P0462Fuel Level Sensor Circuit Low InputLow priorityFuel System30–120 minutes for initial diagnosisP0462 indicates a fault related to fuel level sensor circuit low input. Learn the likely causes and a practical diagnostic order before replacing parts.P0464Fuel Level Sensor Circuit IntermittentLow priorityFuel System30–120 minutes for initial diagnosisP0464 indicates a fault related to fuel level sensor circuit intermittent. Learn the likely causes and a practical diagnostic order before replacing parts.P0465Purge Flow Sensor Circuit MalfunctionLow priorityEmissions System30–120 minutes for initial diagnosisP0465 indicates a fault related to purge flow sensor circuit malfunction. Learn the likely causes and a practical diagnostic order before replacing parts.P0466Purge Flow Sensor Circuit Range/PerformanceLow priorityEmissions System30–120 minutes for initial diagnosisP0466 indicates a fault related to purge flow sensor circuit range/performance. Learn the likely causes and a practical diagnostic order before replacing parts.P0467Purge Flow Sensor Circuit Low InputLow priorityEmissions System30–120 minutes for initial diagnosisP0467 indicates a fault related to purge flow sensor circuit low input. Learn the likely causes and a practical diagnostic order before replacing parts.P0468Purge Flow Sensor Circuit High InputLow priorityEmissions System30–120 minutes for initial diagnosisP0468 indicates a fault related to purge flow sensor circuit high input. Learn the likely causes and a practical diagnostic order before replacing parts.P0469Purge Flow Sensor Circuit IntermittentLow priorityEmissions System30–120 minutes for initial diagnosisP0469 indicates a fault related to purge flow sensor circuit intermittent. Learn the likely causes and a practical diagnostic order before replacing parts.P0496Evaporative Emission System High Purge FlowLow priorityEmissions System30–120 minutes for initial diagnosisP0496 indicates a fault related to evaporative emission system high purge flow. Learn the likely causes and a practical diagnostic order before replacing parts.P0497Evaporative Emission System Low Purge FlowLow priorityEmissions System30–120 minutes for initial diagnosisP0497 indicates a fault related to evaporative emission system low purge flow. Learn the likely causes and a practical diagnostic order before replacing parts.P0498Evaporative Emission System Vent Valve Control Circuit LowLow priorityEmissions System30–120 minutes for initial diagnosisP0498 indicates a fault related to evaporative emission system vent valve control circuit low. Learn the likely causes and a practical diagnostic order before replacing parts.P0499Evaporative Emission System Vent Valve Control Circuit HighLow priorityEmissions System30–120 minutes for initial diagnosisP0499 indicates a fault related to evaporative emission system vent valve control circuit high. Learn the likely causes and a practical diagnostic order before replacing parts.P04ABEVAP System Purge Control Valve B Circuit/OpenLow priorityEmissions System30–120 minutes for initial diagnosisP04AB relates to evap system purge control valve b circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P04ACEVAP System Purge Control Valve B Circuit LowLow priorityEmissions System30–120 minutes for initial diagnosisP04AC relates to evap system purge control valve b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P04ADEVAP System Purge Control Valve B Circuit HighLow priorityEmissions System30–120 minutes for initial diagnosisP04AD relates to evap system purge control valve b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P04AEEVAP System Purge Control Valve B Performance/Stuck OpenLow priorityEmissions System30–120 minutes for initial diagnosisP04AE relates to evap system purge control valve b performance/stuck open. Check the fault conditions and vehicle-specific procedure before replacing parts.P04AFEVAP System Purge Control Valve B Stuck ClosedLow priorityEmissions System30–120 minutes for initial diagnosisP04AF relates to evap system purge control valve b stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P04BBFuel Fill Door Lock Control Circuit/OpenLow priorityFuel System30–120 minutes for initial diagnosisP04BB relates to fuel fill door lock control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P04BCFuel Fill Door Lock Control Range/PerformanceLow priorityFuel System30–120 minutes for initial diagnosisP04BC relates to fuel fill door lock control range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P04BDFuel Fill Door Lock Control Circuit LowLow priorityFuel System30–120 minutes for initial diagnosisP04BD relates to fuel fill door lock control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P04BEFuel Fill Door Lock Control Circuit HighLow priorityFuel System30–120 minutes for initial diagnosisP04BE relates to fuel fill door lock control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.