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 577–600 of 1049

Most searched first

P28A2Cylinder 5 Ion Current Sense Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP28A2 relates to cylinder 5 ion current sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A3Cylinder 5 Ion Current Sense Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP28A3 relates to cylinder 5 ion current sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A4Cylinder 6 Ion Current Sense CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP28A4 relates to cylinder 6 ion current sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A5Cylinder 6 Ion Current Sense Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP28A5 relates to cylinder 6 ion current sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A6Cylinder 6 Ion Current Sense Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP28A6 relates to cylinder 6 ion current sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A7Cylinder 6 Ion Current Sense Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP28A7 relates to cylinder 6 ion current sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A8Cylinder 7 Ion Current Sense CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP28A8 relates to cylinder 7 ion current sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28A9Cylinder 7 Ion Current Sense Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP28A9 relates to cylinder 7 ion current sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P28AACylinder 7 Ion Current Sense Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP28AA relates to cylinder 7 ion current sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28ABCylinder 7 Ion Current Sense Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP28AB relates to cylinder 7 ion current sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P28ACCylinder 8 Ion Current Sense CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP28AC relates to cylinder 8 ion current sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28ADCylinder 8 Ion Current Sense Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP28AD relates to cylinder 8 ion current sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P28AECylinder 8 Ion Current Sense Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP28AE relates to cylinder 8 ion current sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28AFCylinder 8 Ion Current Sense Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP28AF relates to cylinder 8 ion current sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B0Cylinder 9 Ion Current Sense CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP28B0 relates to cylinder 9 ion current sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B1Cylinder 9 Ion Current Sense Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP28B1 relates to cylinder 9 ion current sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B2Cylinder 9 Ion Current Sense Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP28B2 relates to cylinder 9 ion current sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B3Cylinder 9 Ion Current Sense Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP28B3 relates to cylinder 9 ion current sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B4Cylinder 10 Ion Current Sense CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP28B4 relates to cylinder 10 ion current sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B5Cylinder 10 Ion Current Sense Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP28B5 relates to cylinder 10 ion current sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B6Cylinder 10 Ion Current Sense Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP28B6 relates to cylinder 10 ion current sense circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B7Cylinder 10 Ion Current Sense Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP28B7 relates to cylinder 10 ion current sense circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B8Cylinder 11 Ion Current Sense CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP28B8 relates to cylinder 11 ion current sense circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P28B9Cylinder 11 Ion Current Sense Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP28B9 relates to cylinder 11 ion current sense circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.