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 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 1049

Most searched first

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.P005AB Camshaft Profile Actuator A Control Performance/Stuck Off Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP005A relates to b camshaft profile actuator a control performance/stuck off bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P005BB Camshaft Profile Actuator A Control Stuck On Bank 1Check soonEngine Problems30–120 minutes for initial diagnosisP005B relates to b camshaft profile actuator a control stuck on bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P005CB Camshaft Profile Actuator A Control Performance/Stuck Off Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP005C relates to b camshaft profile actuator a control performance/stuck off bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P005DB Camshaft Profile Actuator A Control Stuck On Bank 2Check soonEngine Problems30–120 minutes for initial diagnosisP005D relates to b camshaft profile actuator a control stuck on bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0075Intake Valve Control Solenoid Circuit Bank 1Check soonEngine Problems45–120 minutes for initial diagnosisP0075 means Intake Valve Control Solenoid Circuit Bank 1. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0078Exhaust Valve Control Solenoid Circuit Bank 1Check soonEngine Problems45–120 minutes for initial diagnosisP0078 means Exhaust Valve Control Solenoid Circuit Bank 1. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P00B1Radiator Coolant Temperature Sensor CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP00B1 relates to radiator coolant temperature sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P00B2Radiator Coolant Temperature Sensor Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP00B2 relates to radiator coolant temperature sensor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P00B3Radiator Coolant Temperature Sensor Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP00B3 relates to radiator coolant temperature sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P00B4Radiator Coolant Temperature Sensor Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP00B4 relates to radiator coolant temperature sensor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P00B5Radiator Coolant Temperature Sensor Circuit Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP00B5 relates to radiator coolant temperature sensor circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P00B6Radiator Coolant Temperature/Engine Coolant Temperature CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP00B6 relates to radiator coolant temperature/engine coolant temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P00B7Engine Coolant Flow Low/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP00B7 relates to engine coolant flow low/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P00DECharge Air Cooler Coolant Temperature Sensor A CircuitCheck soonEngine Problems30–120 minutes for initial diagnosisP00DE relates to charge air cooler coolant temperature sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P00DFCharge Air Cooler Coolant Temperature Sensor A Circuit Range/PerformanceCheck soonEngine Problems30–120 minutes for initial diagnosisP00DF relates to charge air cooler coolant temperature sensor a circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P00E0Charge Air Cooler Coolant Temperature Sensor A Circuit LowCheck soonEngine Problems30–120 minutes for initial diagnosisP00E0 relates to charge air cooler coolant temperature sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P00E1Charge Air Cooler Coolant Temperature Sensor A Circuit HighCheck soonEngine Problems30–120 minutes for initial diagnosisP00E1 relates to charge air cooler coolant temperature sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P00E2Charge Air Cooler Coolant Temperature Sensor A Intermittent/ErraticCheck soonEngine Problems30–120 minutes for initial diagnosisP00E2 relates to charge air cooler coolant temperature sensor a intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P011AEngine Coolant Temperature Sensor 1/2 CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP011A relates to engine coolant temperature sensor 1/2 correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P011BEngine Coolant Temperature/Intake Air Temperature CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP011B relates to engine coolant temperature/intake air temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P011EEngine Coolant Temperature 1 / Ambient Air Temperature CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP011E relates to engine coolant temperature 1 / ambient air temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P011FEngine Coolant Temperature 2 / Ambient Air Temperature CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP011F relates to engine coolant temperature 2 / ambient air temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P0126Insufficient Coolant Temperature for Stable OperationCheck soonEngine Problems30–120 minutes for initial diagnosisP0126 relates to insufficient coolant temperature for stable operation. Check the fault conditions and vehicle-specific procedure before replacing parts.