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.

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 1441–1464 of 8256

Most searched first

P05B8Restraint Deployment Signal Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05B8 relates to restraint deployment signal circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05B9Restraint Deployment Signal Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05B9 relates to restraint deployment signal circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05BARestraint Deployment Signal Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05BA relates to restraint deployment signal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05BBRestraints DeployedCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05BB relates to restraints deployed. Check the fault conditions and vehicle-specific procedure before replacing parts.P05BCStop-Start Mode Switch Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05BC relates to stop-start mode switch circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05BDStop-Start Mode Switch Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05BD relates to stop-start mode switch circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05BEStop-Start Mode Switch Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05BE relates to stop-start mode switch circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05BFStop-Start Mode Switch Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05BF relates to stop-start mode switch circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C2Engine Coolant Pressure Sensor CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP05C2 relates to engine coolant pressure sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C3Engine Coolant Pressure Sensor Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP05C3 relates to engine coolant pressure sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C4Engine Coolant Pressure Sensor Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP05C4 relates to engine coolant pressure sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C5Engine Coolant Pressure Sensor Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP05C5 relates to engine coolant pressure sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C6Engine Coolant Pressure Sensor Circuit Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP05C6 relates to engine coolant pressure sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C7Economy Mode Switch Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05C7 relates to economy mode switch circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C8Economy Mode Switch Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05C8 relates to economy mode switch circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05C9Economy Mode Switch Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05C9 relates to economy mode switch circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05CAEconomy Mode Switch Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05CA relates to economy mode switch circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05CBVehicle Hardware IncompatibilityCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05CB relates to vehicle hardware incompatibility. Check the fault conditions and vehicle-specific procedure before replacing parts.P05CCCold Start A Camshaft Position Timing Performance Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP05CC relates to cold start a camshaft position timing performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P05CDCold Start A Camshaft Position Timing Performance Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP05CD relates to cold start a camshaft position timing performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P05CECold Start B Camshaft Position Timing Performance Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP05CE relates to cold start b camshaft position timing performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P05CFCold Start B Camshaft Position Timing Performance Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP05CF relates to cold start b camshaft position timing performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P05D0Driver Mode Select Switch A CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05D0 relates to driver mode select switch a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P05D1Driver Mode Select Switch A Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05D1 relates to driver mode select switch a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.