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.

Sensors & Electronics 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 1561–1584 of 1939

Most searched first

P279EFour Wheel Drive (4WD) Range Signal Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP279E relates to four wheel drive (4wd) range signal circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P279FFour Wheel Drive (4WD) Range Signal Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP279F relates to four wheel drive (4wd) range signal circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P27A0Four Wheel Drive (4WD) Range Signal Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP27A0 relates to four wheel drive (4wd) range signal circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2887Park Lock/Pawl Actuator CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2887 relates to park lock/pawl actuator circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2888Park Lock/Pawl Actuator Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2888 relates to park lock/pawl actuator circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2889Park Lock/Pawl Actuator Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2889 relates to park lock/pawl actuator circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P288APark Lock/Pawl Actuator Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP288A relates to park lock/pawl actuator circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P288BPark Lock/Pawl Actuator Circuit PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP288B relates to park lock/pawl actuator circuit performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P28F7Exhaust Pressure Too High Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP28F7 relates to exhaust pressure too high bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P28F8Exhaust Pressure Too High Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP28F8 relates to exhaust pressure too high bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P28F9Exhaust Pressure Too Low Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP28F9 relates to exhaust pressure too low bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P28FAExhaust Pressure Too Low Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP28FA relates to exhaust pressure too low bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A00O2 Sensor Circuit Range/Performance Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A00 relates to o2 sensor circuit range/performance bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A01O2 Sensor Circuit Range/Performance Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A01 relates to o2 sensor circuit range/performance bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A02O2 Sensor Circuit Range/Performance Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A02 relates to o2 sensor circuit range/performance bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A03O2 Sensor Circuit Range/Performance Bank 2 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A03 relates to o2 sensor circuit range/performance bank 2 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A04O2 Sensor Circuit Range/Performance Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A04 relates to o2 sensor circuit range/performance bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A05O2 Sensor Circuit Range/Performance Bank 2 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A05 relates to o2 sensor circuit range/performance bank 2 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A0AManifold Absolute Pressure Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0A relates to manifold absolute pressure sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A0BManifold Absolute Pressure Sensor B Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0B relates to manifold absolute pressure sensor b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A0CManifold Absolute Pressure Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0C relates to manifold absolute pressure sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A0DManifold Absolute Pressure Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0D relates to manifold absolute pressure sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A0EManifold Absolute Pressure Sensor B Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0E relates to manifold absolute pressure sensor b circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P2A38O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A38 relates to o2 sensor positive current control circuit/open bank 1 sensor 3. Check the fault conditions and vehicle-specific procedure before replacing parts.