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 25–48 of 6682

Most searched first

P001FA Camshaft Profile Actuator A Control Circuit High Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP001F relates to a camshaft profile actuator a control circuit high bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0026Intake Valve Control Solenoid Circuit Range/Performance Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0026 relates to intake valve control solenoid circuit range/performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0027Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0027 relates to exhaust valve control solenoid circuit range/performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0028Intake Valve Control Solenoid Circuit Range/Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0028 relates to intake valve control solenoid circuit range/performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0029Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0029 relates to exhaust valve control solenoid circuit range/performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P002AB Camshaft Profile Actuator A Control Circuit/Open Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP002A relates to b camshaft profile actuator a control circuit/open bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P002BB Camshaft Profile Actuator A Control Circuit Low Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP002B relates to b camshaft profile actuator a control circuit low bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P002CB Camshaft Profile Actuator A Control Circuit High Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP002C relates to b camshaft profile actuator a control circuit high bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P002DB Camshaft Profile Actuator A Control Circuit/Open Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP002D relates to b camshaft profile actuator a control circuit/open bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P002EB Camshaft Profile Actuator A Control Circuit Low Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP002E relates to b camshaft profile actuator a control circuit low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P002FB Camshaft Profile Actuator A Control Circuit High Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP002F relates to b camshaft profile actuator a control circuit high bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0033Turbocharger/Supercharger Bypass Valve A Control CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0033 relates to turbocharger/supercharger bypass valve a control circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P0034Turbocharger/Supercharger Bypass Valve A Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0034 relates to turbocharger/supercharger bypass valve a control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P0035Turbocharger/Supercharger Bypass Valve A Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0035 relates to turbocharger/supercharger bypass valve a control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0039Turbocharger/Supercharger Bypass Valve A Control Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0039 relates to turbocharger/supercharger bypass valve a control circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P003ATurbocharger/Supercharger Boost Control A Position Exceeded Learning LimitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP003A relates to turbocharger/supercharger boost control a position exceeded learning limit. Check the fault conditions and vehicle-specific procedure before replacing parts.P003BTurbocharger/Supercharger Boost Control B Position Exceeded Learning LimitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP003B relates to turbocharger/supercharger boost control b position exceeded learning limit. Check the fault conditions and vehicle-specific procedure before replacing parts.P003CA Camshaft Profile Actuator A Control Performance/Stuck Off Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP003C relates to a camshaft profile actuator a control performance/stuck off bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P003DA Camshaft Profile Actuator A Control Stuck On Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP003D relates to a camshaft profile actuator a control stuck on bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P003EA Camshaft Profile Actuator A Control Performance/Stuck Off Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP003E relates to a camshaft profile actuator a control performance/stuck off bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P003FA Camshaft Profile Actuator A Control Stuck On Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP003F relates to a camshaft profile actuator a control stuck on bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0040O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 2 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP0040 relates to o2 sensor signals swapped bank 1 sensor 1/bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P0041O2 Sensor Signals Swapped Bank 1 Sensor 2/Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP0041 relates to o2 sensor signals swapped bank 1 sensor 2/bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0045Turbocharger/Supercharger Boost Control A Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0045 relates to turbocharger/supercharger boost control a circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.