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 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 145–168 of 1016

Most searched first

P021ACylinder 7 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021A relates to cylinder 7 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021BCylinder 8 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021B relates to cylinder 8 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021CCylinder 9 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021C relates to cylinder 9 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021DCylinder 10 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021D relates to cylinder 10 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021ECylinder 11 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021E relates to cylinder 11 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P021FCylinder 12 Injection TimingCheck soonFuel System30–120 minutes for initial diagnosisP021F relates to cylinder 12 injection timing. Check the fault conditions and vehicle-specific procedure before replacing parts.P0230Fuel Pump Primary Circuit MalfunctionFuel SystemFix P0230 fuel pump primary circuit code - relay, wiring, and fuel pump control module causes and solutions.P023FFuel Pump Secondary Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP023F relates to fuel pump secondary circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P0251Injection Pump Fuel Metering Control A (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0251 relates to injection pump fuel metering control a (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0252Injection Pump Fuel Metering Control A Range/Performance (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0252 relates to injection pump fuel metering control a range/performance (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0253Injection Pump Fuel Metering Control A Low (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0253 relates to injection pump fuel metering control a low (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0254Injection Pump Fuel Metering Control A High (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0254 relates to injection pump fuel metering control a high (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0255Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0255 relates to injection pump fuel metering control a intermittent (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0256Injection Pump Fuel Metering Control B (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0256 relates to injection pump fuel metering control b (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0257Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0257 relates to injection pump fuel metering control b range/performance (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0258Injection Pump Fuel Metering Control B Low (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0258 relates to injection pump fuel metering control b low (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0259Injection Pump Fuel Metering Control B High (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0259 relates to injection pump fuel metering control b high (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P025AFuel Pump Module A Control Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP025A relates to fuel pump module a control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P025BFuel Pump Module A Control Circuit Range/PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP025B relates to fuel pump module a control circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P025CFuel Pump Module A Control Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP025C relates to fuel pump module a control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P025DFuel Pump Module A Control Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP025D relates to fuel pump module a control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0260Injection Pump Fuel Metering Control B Intermittent (Cam/Rotor/Injector)Check soonFuel System30–120 minutes for initial diagnosisP0260 relates to injection pump fuel metering control b intermittent (cam/rotor/injector). Check the fault conditions and vehicle-specific procedure before replacing parts.P0261Cylinder 1 Injector A Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP0261 relates to cylinder 1 injector a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0262Cylinder 1 Injector A Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP0262 relates to cylinder 1 injector a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.