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 Check soon 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 769–792 of 975

Most searched first

P2A60Alternative Fuel Tank B Level Sensor Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP2A60 relates to alternative fuel tank b level sensor range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A61Alternative Fuel Tank B Level Sensor Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2A61 relates to alternative fuel tank b level sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A62Alternative Fuel Tank B Level Sensor Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2A62 relates to alternative fuel tank b level sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A63Alternative Fuel Tank B Level Sensor Circuit Intermittent/ErraticCheck soonFuel System30–120 minutes for initial diagnosisP2A63 relates to alternative fuel tank b level sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A64Alternative Fuel Tank C Level Sensor CircuitCheck soonFuel System30–120 minutes for initial diagnosisP2A64 relates to alternative fuel tank c level sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A65Alternative Fuel Tank C Level Sensor Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP2A65 relates to alternative fuel tank c level sensor range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A66Alternative Fuel Tank C Level Sensor Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2A66 relates to alternative fuel tank c level sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A67Alternative Fuel Tank C Level Sensor Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2A67 relates to alternative fuel tank c level sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A68Alternative Fuel Tank C Level Sensor Circuit Intermittent/ErraticCheck soonFuel System30–120 minutes for initial diagnosisP2A68 relates to alternative fuel tank c level sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A69Alternative Fuel Rail Pressure Regulator Inlet Pressure Sensor CircuitCheck soonFuel System30–120 minutes for initial diagnosisP2A69 relates to alternative fuel rail pressure regulator inlet pressure sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A6AAlternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP2A6A relates to alternative fuel rail pressure regulator inlet pressure sensor range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A6BAlternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2A6B relates to alternative fuel rail pressure regulator inlet pressure sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A6CAlternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2A6C relates to alternative fuel rail pressure regulator inlet pressure sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A6DAlternative Fuel Rail Pressure Regulator Inlet Pressure Sensor Circuit Intermittent/ErraticCheck soonFuel System30–120 minutes for initial diagnosisP2A6D relates to alternative fuel rail pressure regulator inlet pressure sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A6EAlternative Fuel Rail Pressure Regulator Inlet Pressure Too LowCheck soonFuel System30–120 minutes for initial diagnosisP2A6E relates to alternative fuel rail pressure regulator inlet pressure too low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A6FAlternative Fuel Rail Pressure Regulator Inlet Pressure Too HighCheck soonFuel System30–120 minutes for initial diagnosisP2A6F relates to alternative fuel rail pressure regulator inlet pressure too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A70Alternative Fuel Hydraulic Fuel Pump Select Valve Control CircuitCheck soonFuel System30–120 minutes for initial diagnosisP2A70 relates to alternative fuel hydraulic fuel pump select valve control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A71Alternative Fuel Hydraulic Fuel Pump Select Valve Control Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP2A71 relates to alternative fuel hydraulic fuel pump select valve control range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A72Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2A72 relates to alternative fuel hydraulic fuel pump select valve control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A73Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2A73 relates to alternative fuel hydraulic fuel pump select valve control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A74Alternative Fuel Hydraulic Fuel Pump Select Valve Control Circuit Intermittent/ErraticCheck soonFuel System30–120 minutes for initial diagnosisP2A74 relates to alternative fuel hydraulic fuel pump select valve control circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A75Alternative Fuel Hydraulic Pump Pressure Sensor CircuitCheck soonFuel System30–120 minutes for initial diagnosisP2A75 relates to alternative fuel hydraulic pump pressure sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A76Alternative Fuel Hydraulic Pump Pressure Sensor Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP2A76 relates to alternative fuel hydraulic pump pressure sensor range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A77Alternative Fuel Hydraulic Pump Pressure Sensor Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2A77 relates to alternative fuel hydraulic pump pressure sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.