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 385–408 of 975

Most searched first

P20F7Reductant Injection Valve Stuck Open Bank 2 Unit 1Check soonFuel System30–120 minutes for initial diagnosisP20F7 relates to reductant injection valve stuck open bank 2 unit 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P213EFuel Injection System Fault - Forced Engine ShutdownCheck soonFuel System30–120 minutes for initial diagnosisP213E relates to fuel injection system fault - forced engine shutdown. Check the fault conditions and vehicle-specific procedure before replacing parts.P213FFuel Pump System Fault - Forced Engine ShutdownCheck soonFuel System30–120 minutes for initial diagnosisP213F relates to fuel pump system fault - forced engine shutdown. Check the fault conditions and vehicle-specific procedure before replacing parts.P2146Fuel Injector Group A Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP2146 relates to fuel injector group a supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2147Fuel Injector Group A Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2147 relates to fuel injector group a supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2148Fuel Injector Group A Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2148 relates to fuel injector group a supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2149Fuel Injector Group B Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP2149 relates to fuel injector group b supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2150Fuel Injector Group B Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2150 relates to fuel injector group b supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2151Fuel Injector Group B Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2151 relates to fuel injector group b supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2152Fuel Injector Group C Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP2152 relates to fuel injector group c supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2153Fuel Injector Group C Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2153 relates to fuel injector group c supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2154Fuel Injector Group C Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2154 relates to fuel injector group c supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2155Fuel Injector Group D Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP2155 relates to fuel injector group d supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2156Fuel Injector Group D Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP2156 relates to fuel injector group d supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2157Fuel Injector Group D Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP2157 relates to fuel injector group d supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P216AFuel Injector Group E Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP216A relates to fuel injector group e supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P216BFuel Injector Group E Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP216B relates to fuel injector group e supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P216CFuel Injector Group E Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP216C relates to fuel injector group e supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P216DFuel Injector Group F Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP216D relates to fuel injector group f supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P216EFuel Injector Group F Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP216E relates to fuel injector group f supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P216FFuel Injector Group F Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP216F relates to fuel injector group f supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P217AFuel Injector Group G Supply Voltage Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP217A relates to fuel injector group g supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P217BFuel Injector Group G Supply Voltage Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP217B relates to fuel injector group g supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P217CFuel Injector Group G Supply Voltage Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP217C relates to fuel injector group g supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.