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 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 4681–4704 of 6682

Most searched first

P269EExhaust Aftertreatment Glow Plug Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP269E relates to exhaust aftertreatment glow plug control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P269FExhaust Aftertreatment Glow Plug Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP269F relates to exhaust aftertreatment glow plug circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A0Exhaust Aftertreatment Glow Plug PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP26A0 relates to exhaust aftertreatment glow plug performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A1Exhaust Aftertreatment Glow Plug Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP26A1 relates to exhaust aftertreatment glow plug circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A2Exhaust Aftertreatment Glow Plug Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP26A2 relates to exhaust aftertreatment glow plug circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A3Engine Coolant Bypass Valve A Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP26A3 relates to engine coolant bypass valve a range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A4Engine Coolant Bypass Valve A Position Sensor CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP26A4 relates to engine coolant bypass valve a position sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A5Engine Coolant Bypass Valve A Position Sensor Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP26A5 relates to engine coolant bypass valve a position sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A6Engine Coolant Bypass Valve A Position Sensor Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP26A6 relates to engine coolant bypass valve a position sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A7Engine Coolant Bypass Valve A Position Sensor Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP26A7 relates to engine coolant bypass valve a position sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A8Engine Coolant Bypass Valve A Position Sensor Circuit Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP26A8 relates to engine coolant bypass valve a position sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P26A9Engine Coolant Bypass Valve A Position Sensor Stop/Minimum Stop PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP26A9 relates to engine coolant bypass valve a position sensor stop/minimum stop performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P26AAEngine Coolant Bypass Valve A Position Sensor Maximum Stop PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP26AA relates to engine coolant bypass valve a position sensor maximum stop performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P26ABEngine Coolant Bypass Valve A Stuck/OpenCheck soonEngine Problems30–120 minutes for initial diagnosisP26AB relates to engine coolant bypass valve a stuck/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P26ACEngine Coolant Bypass Valve B Control Circuit/OpenCheck soonEngine Problems30–120 minutes for initial diagnosisP26AC relates to engine coolant bypass valve b control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P26ADEngine Coolant Bypass Valve B Control Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP26AD relates to engine coolant bypass valve b control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P26AEEngine Coolant Bypass Valve B Control Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP26AE relates to engine coolant bypass valve b control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P26AFEngine Coolant Bypass Valve B Stuck/OpenCheck soonEngine Problems30–120 minutes for initial diagnosisP26AF relates to engine coolant bypass valve b stuck/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P26B0Engine Coolant Bypass Valve B Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP26B0 relates to engine coolant bypass valve b range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P26B1Engine Coolant Bypass Valve A Stuck ClosedCheck soonEngine Problems30–120 minutes for initial diagnosisP26B1 relates to engine coolant bypass valve a stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P26B2Engine Coolant Bypass Valve B Stuck ClosedCheck soonEngine Problems30–120 minutes for initial diagnosisP26B2 relates to engine coolant bypass valve b stuck closed. Check the fault conditions and vehicle-specific procedure before replacing parts.P26B3Fuel Shutoff Valve A Control Circuit Performance/Stuck OffCheck soonFuel System30–120 minutes for initial diagnosisP26B3 relates to fuel shutoff valve a control circuit performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P26B4Fuel Shutoff Valve A Control Circuit Stuck OnCheck soonFuel System30–120 minutes for initial diagnosisP26B4 relates to fuel shutoff valve a control circuit stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P26B5Fuel Shutoff Valve B Control Circuit Performance/Stuck OffCheck soonFuel System30–120 minutes for initial diagnosisP26B5 relates to fuel shutoff valve b control circuit performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.