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.

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 3769–3792 of 7353

Most searched first

P20F3SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 2Low priorityEmissions System30–120 minutes for initial diagnosisP20F3 relates to scr nox pre- catalyst efficiency below threshold bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P20F4Reductant Consumption Too LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20F4 relates to reductant consumption too low. Check the fault conditions and vehicle-specific procedure before replacing parts.P20F5Reductant Consumption Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20F5 relates to reductant consumption too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P20F6Reductant Injection Valve Stuck Open Bank 1 Unit 1Check soonFuel System30–120 minutes for initial diagnosisP20F6 relates to reductant injection valve stuck open bank 1 unit 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P20F7Reductant Injection Valve Stuck Open Bank 2 Unit 1Check soonFuel System30–120 minutes for initial diagnosisP20F7 relates to reductant injection valve stuck open bank 2 unit 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P20F8Intake Manifold Runner Control Circuit Performance Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP20F8 relates to intake manifold runner control circuit performance bank 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P20F9Intake Manifold Runner Control Circuit Performance Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP20F9 relates to intake manifold runner control circuit performance bank 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P20FAReductant Pump B Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20FA relates to reductant pump b control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P20FBReductant Pump B Control Performance/Stuck OffCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20FB relates to reductant pump b control performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P20FCReductant Pump B Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20FC relates to reductant pump b control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P20FDReductant Pump B Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20FD relates to reductant pump b control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P20FEReductant Metering Unit 1 PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20FE relates to reductant metering unit 1 performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P20FFReductant Control Module PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP20FF relates to reductant control module performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2100Throttle Actuator A Control Motor Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2100 relates to throttle actuator a control motor circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P2101Throttle Actuator A Control Motor Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2101 relates to throttle actuator a control motor circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2102Throttle Actuator A Control Motor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2102 relates to throttle actuator a control motor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2103Throttle Actuator A Control Motor Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2103 relates to throttle actuator a control motor circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2104Throttle Actuator Control System - Forced IdleCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2104 relates to throttle actuator control system - forced idle. Check the fault conditions and vehicle-specific procedure before replacing parts.P2105Throttle Actuator Control System - Forced Engine ShutdownCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2105 relates to throttle actuator control system - forced engine shutdown. Check the fault conditions and vehicle-specific procedure before replacing parts.P2106Throttle Actuator Control System - Forced Limited PowerCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2106 relates to throttle actuator control system - forced limited power. Check the fault conditions and vehicle-specific procedure before replacing parts.P2107Throttle Actuator A Control Module ProcessorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2107 relates to throttle actuator a control module processor. Check the fault conditions and vehicle-specific procedure before replacing parts.P2108Throttle Actuator A Control Module PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2108 relates to throttle actuator a control module performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2109Throttle/Pedal Position Sensor A Minimum Stop PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2109 relates to throttle/pedal position sensor a minimum stop performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P210AThrottle Actuator B Control Motor Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP210A relates to throttle actuator b control motor circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.