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.

Engine Problems 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 49–72 of 1049

Most searched first

P012FEngine Coolant Temperature / Engine Oil Temperature CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP012F relates to engine coolant temperature / engine oil temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P015FExcessive Time to Enter Closed Loop Cylinder Balance ControlCheck soonEngine Problems30–120 minutes for initial diagnosisP015F relates to excessive time to enter closed loop cylinder balance control. Check the fault conditions and vehicle-specific procedure before replacing parts.P017ACylinder Head Temperature Sensor A CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP017A relates to cylinder head temperature sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P017BCylinder Head Temperature Sensor A Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP017B relates to cylinder head temperature sensor a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P017CCylinder Head Temperature Sensor A Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP017C relates to cylinder head temperature sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P017DCylinder Head Temperature Sensor A Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP017D relates to cylinder head temperature sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P017ECylinder Head Temperature Sensor A Circuit Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP017E relates to cylinder head temperature sensor a circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E3Engine Coolant Temperature Sensor 3 CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP01E3 relates to engine coolant temperature sensor 3 circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E4Engine Coolant Temperature Sensor 3 Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP01E4 relates to engine coolant temperature sensor 3 circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E5Engine Coolant Temperature Sensor 3 Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP01E5 relates to engine coolant temperature sensor 3 circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E6Engine Coolant Temperature Sensor 3 Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01E6 relates to engine coolant temperature sensor 3 circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E7Engine Coolant Temperature Sensor 3 Circuit Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP01E7 relates to engine coolant temperature sensor 3 circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E8Engine Coolant Heater A Control Circuit/OpenCheck soonEngine Problems30–120 minutes for initial diagnosisP01E8 relates to engine coolant heater a control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P01E9Engine Coolant Heater A Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP01E9 relates to engine coolant heater a control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P01EAEngine Coolant Heater A Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01EA relates to engine coolant heater a control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01EBEngine Coolant Heater A Control Circuit PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP01EB relates to engine coolant heater a control circuit performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P01ECEngine Coolant Heater B Control Circuit/OpenCheck soonEngine Problems30–120 minutes for initial diagnosisP01EC relates to engine coolant heater b control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P01EDEngine Coolant Heater B Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP01ED relates to engine coolant heater b control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P01EEEngine Coolant Heater B Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01EE relates to engine coolant heater b control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01EFEngine Coolant Heater B Control Circuit PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP01EF relates to engine coolant heater b control circuit performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F0Coolant Temperature Relapsed Below Diagnostic Monitoring TemperatureCheck soonEngine Problems30–120 minutes for initial diagnosisP01F0 relates to coolant temperature relapsed below diagnostic monitoring temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F8Engine Coolant Heater A Control Circuit Driver Current/Temperature Too HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01F8 relates to engine coolant heater a control circuit driver current/temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P01F9Engine Coolant Heater B Control Circuit Driver Current/Temperature Too HighCheck soonEngine Problems30–120 minutes for initial diagnosisP01F9 relates to engine coolant heater b control circuit driver current/temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0219Engine Overspeed ConditionUrgentEngine Problems1–3 hours for initial diagnosisP0219 means Engine Overspeed Condition. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.