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.

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 1993–2016 of 9253

Most searched first

P05DAPCV Regulator Valve Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05DA relates to pcv regulator valve control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05DBBrake Pedal Position Sensor B Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05DB relates to brake pedal position sensor b circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05DCBrake Pedal Position Sensor B Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05DC relates to brake pedal position sensor b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05DDBrake Pedal Position Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05DD relates to brake pedal position sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05DEBrake Pedal Position Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05DE relates to brake pedal position sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05DFBrake Pedal Position Sensor B Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05DF relates to brake pedal position sensor b circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E0Brake Pedal Position Sensor A/B CorrelationCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E0 relates to brake pedal position sensor a/b correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E1A/C Refrigerant Pressure Sensor A Circuit Intermittent/ErraticLow prioritySensors & Electronics30–120 minutes for initial diagnosisP05E1 relates to a/c refrigerant pressure sensor a circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E2A/C Refrigerant Pressure Sensor B Circuit Intermittent/ErraticLow prioritySensors & Electronics30–120 minutes for initial diagnosisP05E2 relates to a/c refrigerant pressure sensor b circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E3Park Brake Sensor/Switch CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E3 relates to park brake sensor/switch circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E4Park Brake Sensor/Switch Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E4 relates to park brake sensor/switch circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E5Park Brake Sensor/Switch Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E5 relates to park brake sensor/switch circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E6Park Brake Sensor/Switch Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E6 relates to park brake sensor/switch circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E7Park Brake Sensor/Switch Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E7 relates to park brake sensor/switch circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E8Engine Oil Bypass Valve Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E8 relates to engine oil bypass valve control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05E9Engine Oil Bypass Valve Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05E9 relates to engine oil bypass valve control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EAEngine Oil Bypass Valve Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP05EA relates to engine oil bypass valve control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EBCold Start SCR NOx Catalyst Inlet Temperature Too LowCheck soonEmissions System30–120 minutes for initial diagnosisP05EB relates to cold start scr nox catalyst inlet temperature too low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05ECCold Start Injection Timing PerformanceCheck soonFuel System30–120 minutes for initial diagnosisP05EC relates to cold start injection timing performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EDReductant Heater Control Module Supply VoltageCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05ED relates to reductant heater control module supply voltage. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EEReductant Pump Supply Voltage Circuit/OpenCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05EE relates to reductant pump supply voltage circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P05EFReductant Pump Supply Voltage Circuit LowCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05EF relates to reductant pump supply voltage circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F0Reductant Pump Supply Voltage Circuit HighCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F0 relates to reductant pump supply voltage circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P05F1Reductant Pump Supply Voltage Circuit Stuck OnCheck soonElectrical & Charging System30–120 minutes for initial diagnosisP05F1 relates to reductant pump supply voltage circuit stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.