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 1369–1392 of 1939

Most searched first

P2590Turbocharger Boost Control Position Sensor B Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2590 relates to turbocharger boost control position sensor b circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P2593Turbocharger Speed Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2593 relates to turbocharger speed sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P2594Turbocharger Speed Sensor B Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2594 relates to turbocharger speed sensor b circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P2595Turbocharger Speed Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2595 relates to turbocharger speed sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2596Turbocharger Speed Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2596 relates to turbocharger speed sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P2597Turbocharger Speed Sensor B Circuit IntermittentCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2597 relates to turbocharger speed sensor b circuit intermittent. Check the fault conditions and vehicle-specific procedure before replacing parts.P2598Turbocharger Boost Control Position Sensor A Performance - Stuck LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2598 relates to turbocharger boost control position sensor a performance - stuck low. Check the fault conditions and vehicle-specific procedure before replacing parts.P2599Turbocharger Boost Control Position Sensor A Performance - Stuck HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2599 relates to turbocharger boost control position sensor a performance - stuck high. Check the fault conditions and vehicle-specific procedure before replacing parts.P259ATurbocharger Boost Control Position Sensor B Performance - Stuck LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP259A relates to turbocharger boost control position sensor b performance - stuck low. Check the fault conditions and vehicle-specific procedure before replacing parts.P259BTurbocharger Boost Control Position Sensor B Performance - Stuck HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP259B relates to turbocharger boost control position sensor b performance - stuck high. Check the fault conditions and vehicle-specific procedure before replacing parts.P259CExcessive Time To Enter Closed Loop Turbocharger A Boost ControlCheck soonSensors & Electronics30–120 minutes for initial diagnosisP259C relates to excessive time to enter closed loop turbocharger a boost control. Check the fault conditions and vehicle-specific procedure before replacing parts.P259DExcessive Time To Enter Closed Loop Turbocharger B Boost ControlCheck soonSensors & Electronics30–120 minutes for initial diagnosisP259D relates to excessive time to enter closed loop turbocharger b boost control. Check the fault conditions and vehicle-specific procedure before replacing parts.P259ETurbocharger A Boost Control Position At Low LimitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP259E relates to turbocharger a boost control position at low limit. Check the fault conditions and vehicle-specific procedure before replacing parts.P259FTurbocharger A Boost Control Position At High LimitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP259F relates to turbocharger a boost control position at high limit. Check the fault conditions and vehicle-specific procedure before replacing parts.P25A0Turbocharger B Boost Control Position At Low LimitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25A0 relates to turbocharger b boost control position at low limit. Check the fault conditions and vehicle-specific procedure before replacing parts.P25A1Turbocharger B Boost Control Position At High LimitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25A1 relates to turbocharger b boost control position at high limit. Check the fault conditions and vehicle-specific procedure before replacing parts.P25A2Brake System Control Module A Requested MIL IlluminationCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25A2 relates to brake system control module a requested mil illumination. Check the fault conditions and vehicle-specific procedure before replacing parts.P25A3Engine Hood OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25A3 relates to engine hood open. Check the fault conditions and vehicle-specific procedure before replacing parts.P25A9Piston Cooling Oil Control Circuit/OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25A9 relates to piston cooling oil control circuit/open. Check the fault conditions and vehicle-specific procedure before replacing parts.P25AAPiston Cooling Oil Control Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25AA relates to piston cooling oil control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P25ABPiston Cooling Oil Control Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25AB relates to piston cooling oil control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P25ACPiston Cooling Oil Control Circuit Performance/Stuck OffCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25AC relates to piston cooling oil control circuit performance/stuck off. Check the fault conditions and vehicle-specific procedure before replacing parts.P25ADPiston Cooling Oil Control Circuit Stuck OnCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25AD relates to piston cooling oil control circuit stuck on. Check the fault conditions and vehicle-specific procedure before replacing parts.P25B3Turbocharger/Supercharger Wastegate A Stuck OpenCheck soonSensors & Electronics30–120 minutes for initial diagnosisP25B3 relates to turbocharger/supercharger wastegate a stuck open. Check the fault conditions and vehicle-specific procedure before replacing parts.