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.

Sensors & Electronics 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 217–240 of 2110

Most searched first

P023EManifold Absolute Pressure - Turbocharger/Supercharger Boost Sensor B CorrelationCheck soonSensors & Electronics30–120 minutes for initial diagnosisP023E relates to manifold absolute pressure - turbocharger/supercharger boost sensor b correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P0240Turbocharger/Supercharger Boost Sensor B Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0240 relates to turbocharger/supercharger boost sensor b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P0241Turbocharger/Supercharger Boost Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0241 relates to turbocharger/supercharger boost sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0242Turbocharger/Supercharger Boost Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0242 relates to turbocharger/supercharger boost sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0243Turbocharger/Supercharger Wastegate Actuator ACheck soonSensors & Electronics30–120 minutes for initial diagnosisP0243 relates to turbocharger/supercharger wastegate actuator a. Check the fault conditions and vehicle-specific procedure before replacing parts.P0244Turbocharger/Supercharger Wastegate Actuator A Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0244 relates to turbocharger/supercharger wastegate actuator a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P0245Turbocharger/Supercharger Wastegate Actuator A LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0245 relates to turbocharger/supercharger wastegate actuator a low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0246Turbocharger/Supercharger Wastegate Actuator A HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0246 relates to turbocharger/supercharger wastegate actuator a high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0247Turbocharger/Supercharger Wastegate Actuator BCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0247 relates to turbocharger/supercharger wastegate actuator b. Check the fault conditions and vehicle-specific procedure before replacing parts.P0248Turbocharger/Supercharger Wastegate Actuator B Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0248 relates to turbocharger/supercharger wastegate actuator b range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P0249Turbocharger/Supercharger Wastegate Actuator B LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0249 relates to turbocharger/supercharger wastegate actuator b low. Check the fault conditions and vehicle-specific procedure before replacing parts.P024ACharge Air Cooler Bypass Control A Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP024A relates to charge air cooler bypass control a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P024BCharge Air Cooler Bypass Control A StuckCheck soonSensors & Electronics30–120 minutes for initial diagnosisP024B relates to charge air cooler bypass control a stuck. Check the fault conditions and vehicle-specific procedure before replacing parts.P024CCharge Air Cooler Bypass Position Sensor A CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP024C relates to charge air cooler bypass position sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P024DCharge Air Cooler Bypass Position Sensor A Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP024D relates to charge air cooler bypass position sensor a circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P024ECharge Air Cooler Bypass Position Sensor A Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP024E relates to charge air cooler bypass position sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P024FCharge Air Cooler Bypass Position Sensor A Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP024F relates to charge air cooler bypass position sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0250Turbocharger/Supercharger Wastegate Actuator B HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0250 relates to turbocharger/supercharger wastegate actuator b high. Check the fault conditions and vehicle-specific procedure before replacing parts.P025ETurbocharger/Supercharger Boost Sensor A Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP025E relates to turbocharger/supercharger boost sensor a intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P025FTurbocharger/Supercharger Boost Sensor B Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP025F relates to turbocharger/supercharger boost sensor b intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P026ACharge Air Cooler Efficiency Below ThresholdCheck soonSensors & Electronics30–120 minutes for initial diagnosisP026A relates to charge air cooler efficiency below threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P0297Vehicle Overspeed ConditionUrgentSensors & Electronics30–120 minutes for initial diagnosisP0297 relates to vehicle overspeed condition. Check the fault conditions and vehicle-specific procedure before replacing parts.P0298Engine Oil Over TemperatureUrgentSensors & Electronics30–120 minutes for initial diagnosisP0298 relates to engine oil over temperature. Check the fault conditions and vehicle-specific procedure before replacing parts.P02CATurbocharger/Supercharger B Overboost ConditionCheck soonSensors & Electronics30–120 minutes for initial diagnosisP02CA relates to turbocharger/supercharger b overboost condition. Check the fault conditions and vehicle-specific procedure before replacing parts.