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9,253 diagnostic guides

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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.

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Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

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All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

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These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 601–624 of 2110

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P06A1Variable A/C Compressor Control Circuit LowLow prioritySensors & Electronics30–120 minutes for initial diagnosisP06A1 relates to variable a/c compressor control circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P06A2Variable A/C Compressor Control Circuit HighLow prioritySensors & Electronics30–120 minutes for initial diagnosisP06A2 relates to variable a/c compressor control circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06AAControl Module Internal Temperature B Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AA relates to control module internal temperature b too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06ABControl Module Internal Temperature Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AB relates to control module internal temperature sensor b circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P06ACControl Module Internal Temperature Sensor B Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AC relates to control module internal temperature sensor b range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06ADControl Module Internal Temperature Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AD relates to control module internal temperature sensor b circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P06AEControl Module Internal Temperature Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AE relates to control module internal temperature sensor b circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06AFTorque Management System - Forced Engine ShutdownCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06AF relates to torque management system - forced engine shutdown. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B6Internal Control Module Knock/Combustion Vibration Sensor Processor 1 PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06B6 relates to internal control module knock/combustion vibration sensor processor 1 performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B7Internal Control Module Knock/Combustion Vibration Sensor Processor 2 PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06B7 relates to internal control module knock/combustion vibration sensor processor 2 performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06B8Internal Control Module Non-Volatile Random Access Memory (NVRAM) ErrorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06B8 relates to internal control module non-volatile random access memory (nvram) error. Check the fault conditions and vehicle-specific procedure before replacing parts.P06D1Internal Control Module Ignition Coil Control PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06D1 relates to internal control module ignition coil control performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06DFGlow Plug Control Module 1 Memory Checksum ErrorCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06DF relates to glow plug control module 1 memory checksum error. Check the fault conditions and vehicle-specific procedure before replacing parts.P06E4Control Module Wake-up Circuit PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06E4 relates to control module wake-up circuit performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06E5Glow Plug Control Module 1 PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06E5 relates to glow plug control module 1 performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06E9Engine Starter PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06E9 relates to engine starter performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06EANOx Sensor Processor Performance Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP06EA relates to nox sensor processor performance bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P06EBNOx Sensor Processor Performance Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP06EB relates to nox sensor processor performance bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P06EDEngine RPM Output Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06ED relates to engine rpm output circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P06EEEngine RPM Output Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06EE relates to engine rpm output circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P06EFEngine Restart PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06EF relates to engine restart performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06F0Reductant Control Module Internal Temperature Sensor CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06F0 relates to reductant control module internal temperature sensor circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P06F1Reductant Control Module Internal Temperature Sensor Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06F1 relates to reductant control module internal temperature sensor range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P06F2Reductant Control Module Internal Temperature Sensor Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP06F2 relates to reductant control module internal temperature sensor circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.