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

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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.

Network & Communication Check soon Clear all

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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 1177–1200 of 1223

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U0004High Speed CAN Communication Bus Positive LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0004 means High Speed CAN Communication Bus Positive Low. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0005High Speed CAN Communication Bus Positive HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0005 means High Speed CAN Communication Bus Positive High. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0006High Speed CAN Communication Bus Negative OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0006 means High Speed CAN Communication Bus Negative Open. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0007High Speed CAN Communication Bus Negative LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0007 means High Speed CAN Communication Bus Negative Low. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0008High Speed CAN Communication Bus Negative HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0008 means High Speed CAN Communication Bus Negative High. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0009High Speed CAN Communication Bus Negative Shorted to PositiveCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0009 means High Speed CAN Communication Bus Negative Shorted to Positive. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0102Lost Communication With Transfer Case Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0102 means Lost Communication With Transfer Case Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0103Lost Communication With Gear Shift Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0103 means Lost Communication With Gear Shift Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0104Lost Communication With Cruise Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0104 means Lost Communication With Cruise Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0105Lost Communication With Fuel Injector Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0105 means Lost Communication With Fuel Injector Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0106Lost Communication With Glow Plug Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0106 means Lost Communication With Glow Plug Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0107Lost Communication With Throttle Actuator Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0107 means Lost Communication With Throttle Actuator Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0108Lost Communication With Alternative Fuel Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0108 means Lost Communication With Alternative Fuel Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0110Lost Communication With Drive Motor Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0110 means Lost Communication With Drive Motor Control Module A. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0112Lost Communication With Battery Energy Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0112 means Lost Communication With Battery Energy Control Module B. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0113Lost Communication With Emissions Critical Control InformationCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0113 means Lost Communication With Emissions Critical Control Information. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0114Lost Communication With Four-Wheel Drive Clutch Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0114 means Lost Communication With Four-Wheel Drive Clutch Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0115Lost Communication With ECM/PCM BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0115 means Lost Communication With ECM/PCM B. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0116Lost Communication With Coolant Temperature Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0116 means Lost Communication With Coolant Temperature Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0117Lost Communication With PTO Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0117 means Lost Communication With PTO Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0118Lost Communication With Fuel Additive Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0118 means Lost Communication With Fuel Additive Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0119Lost Communication With Fuel Cell Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0119 means Lost Communication With Fuel Cell Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0120Lost Communication With Starter/Generator Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0120 means Lost Communication With Starter/Generator Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U0122Lost Communication With Vehicle Dynamics Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0122 means Lost Communication With Vehicle Dynamics Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.