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.

Fuel System Low priority 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 25–34 of 34

Most searched first

P25B0Fuel Level Sensor A StuckLow priorityFuel System30–120 minutes for initial diagnosisP25B0 relates to fuel level sensor a stuck. Check the fault conditions and vehicle-specific procedure before replacing parts.P25B1Fuel Level Sensor B StuckLow priorityFuel System30–120 minutes for initial diagnosisP25B1 relates to fuel level sensor b stuck. Check the fault conditions and vehicle-specific procedure before replacing parts.P25B2Fuel Level Sensor A or B StuckLow priorityFuel System30–120 minutes for initial diagnosisP25B2 relates to fuel level sensor a or b stuck. Check the fault conditions and vehicle-specific procedure before replacing parts.P25D7Fuel Level Sensor C CircuitLow priorityFuel System30–120 minutes for initial diagnosisP25D7 relates to fuel level sensor c circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P25D8Fuel Level Sensor C PerformanceLow priorityFuel System30–120 minutes for initial diagnosisP25D8 relates to fuel level sensor c performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P25D9Fuel Level Sensor C Circuit LowLow priorityFuel System30–120 minutes for initial diagnosisP25D9 relates to fuel level sensor c circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P25DAFuel Level Sensor C Circuit HighLow priorityFuel System30–120 minutes for initial diagnosisP25DA relates to fuel level sensor c circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P25DBFuel Level Sensor C Circuit IntermittentLow priorityFuel System30–120 minutes for initial diagnosisP25DB relates to fuel level sensor c circuit intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P25DCFuel Level Sensor C StuckLow priorityFuel System30–120 minutes for initial diagnosisP25DC relates to fuel level sensor c stuck. Check the fault conditions and vehicle-specific procedure before replacing parts.P2C51Fuel Level Sensor A/B CorrelationLow priorityFuel System30–120 minutes for initial diagnosisP2C51 relates to fuel level sensor a/b correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.