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 4225–4248 of 8256

Most searched first

P2338Cylinder 3 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2338 relates to cylinder 3 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2339Cylinder 4 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2339 relates to cylinder 4 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P233AFuel Pressure Regulator C Control Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP233A relates to fuel pressure regulator c control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P233BFuel Pressure Regulator C Control Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP233B relates to fuel pressure regulator c control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P233CFuel Pressure Regulator C Control Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP233C relates to fuel pressure regulator c control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P233DFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit/OpenCheck soonFuel System30–120 minutes for initial diagnosisP233D relates to fuel pressure regulator b solenoid supply voltage control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P233EFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit LowCheck soonFuel System30–120 minutes for initial diagnosisP233E relates to fuel pressure regulator b solenoid supply voltage control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P233FFuel Pressure Regulator B Solenoid Supply Voltage Control Circuit HighCheck soonFuel System30–120 minutes for initial diagnosisP233F relates to fuel pressure regulator b solenoid supply voltage control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2340Cylinder 5 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2340 relates to cylinder 5 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2341Cylinder 6 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2341 relates to cylinder 6 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2342Cylinder 7 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2342 relates to cylinder 7 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2343Cylinder 8 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2343 relates to cylinder 8 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2344Cylinder 9 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2344 relates to cylinder 9 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2345Cylinder 10 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2345 relates to cylinder 10 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2346Cylinder 11 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2346 relates to cylinder 11 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2347Cylinder 12 Above Knock/Combustion Vibration Sensor ThresholdCheck soonEngine Problems30–120 minutes for initial diagnosisP2347 relates to cylinder 12 above knock/combustion vibration sensor threshold. Check the fault conditions and vehicle-specific procedure before replacing parts.P2348Cylinder 9 Pressure Sensor CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP2348 relates to cylinder 9 pressure sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2349Cylinder 9 Pressure Sensor Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP2349 relates to cylinder 9 pressure sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P234ACylinder 9 Pressure Sensor Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP234A relates to cylinder 9 pressure sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P234BCylinder 9 Pressure Sensor Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP234B relates to cylinder 9 pressure sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P234CCylinder 9 Pressure Sensor Circuit Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP234C relates to cylinder 9 pressure sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P234DCylinder 9 Pressure Too LowCheck soonEngine Problems30–120 minutes for initial diagnosisP234D relates to cylinder 9 pressure too low. Check the fault conditions and vehicle-specific procedure before replacing parts.P234ECylinder 9 Pressure Too HighCheck soonEngine Problems30–120 minutes for initial diagnosisP234E relates to cylinder 9 pressure too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P234FCylinder 9 Pressure Variation LowCheck soonEngine Problems30–120 minutes for initial diagnosisP234F relates to cylinder 9 pressure variation low. Check the fault conditions and vehicle-specific procedure before replacing parts.