Diagnostic library

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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 97–120 of 1223

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U0092Vehicle Communication Bus HCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0092 concerns vehicle communication bus h. Learn what this fault indicates and where to begin diagnosis.U0093Vehicle Communication Bus H PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0093 concerns vehicle communication bus h performance. Learn what this fault indicates and where to begin diagnosis.U0094Vehicle Communication Bus H (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0094 concerns vehicle communication bus h (+) open. Learn what this fault indicates and where to begin diagnosis.U0095Vehicle Communication Bus H (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0095 concerns vehicle communication bus h (+) low. Learn what this fault indicates and where to begin diagnosis.U0096Vehicle Communication Bus H (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0096 concerns vehicle communication bus h (+) high. Learn what this fault indicates and where to begin diagnosis.U0097Vehicle Communication Bus H (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0097 concerns vehicle communication bus h (-) open. Learn what this fault indicates and where to begin diagnosis.U0098Vehicle Communication Bus H (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0098 concerns vehicle communication bus h (-) low. Learn what this fault indicates and where to begin diagnosis.U0099Vehicle Communication Bus H (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0099 concerns vehicle communication bus h (-) high. Learn what this fault indicates and where to begin diagnosis.U009AVehicle Communication Bus H (-) shorted to Bus H (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU009A concerns vehicle communication bus h (-) shorted to bus h (+). Learn what this fault indicates and where to begin diagnosis.U009BVehicle Communication Bus ICheck soonNetwork & Communication45–120 minutes for initial diagnosisU009B concerns vehicle communication bus i. Learn what this fault indicates and where to begin diagnosis.U009CVehicle Communication Bus I PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU009C concerns vehicle communication bus i performance. Learn what this fault indicates and where to begin diagnosis.U009DVehicle Communication Bus JCheck soonNetwork & Communication45–120 minutes for initial diagnosisU009D concerns vehicle communication bus j. Learn what this fault indicates and where to begin diagnosis.U009EVehicle Communication Bus J PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU009E concerns vehicle communication bus j performance. Learn what this fault indicates and where to begin diagnosis.U0109Lost Communication With Fuel Pump Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0109 means Lost Communication With Fuel Pump Control Module. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U010ALost Communication With Exhaust Gas Recirculation Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU010A concerns lost communication with exhaust gas recirculation control module a. Learn what this fault indicates and where to begin diagnosis.U010BLost Communication With Exhaust Gas Recirculation Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU010B concerns lost communication with exhaust gas recirculation control module b. Learn what this fault indicates and where to begin diagnosis.U010CLost Communication With Turbocharger/Supercharger Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU010C concerns lost communication with turbocharger/supercharger control module a. Learn what this fault indicates and where to begin diagnosis.U010DLost Communication With Turbocharger/Supercharger Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU010D concerns lost communication with turbocharger/supercharger control module b. Learn what this fault indicates and where to begin diagnosis.U010ELost Communication With Reductant Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU010E concerns lost communication with reductant control module. Learn what this fault indicates and where to begin diagnosis.U010FLost Communication With Air Conditioning Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU010F concerns lost communication with air conditioning control module. Learn what this fault indicates and where to begin diagnosis.U0111Lost Communication With Battery Energy Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0111 means Lost Communication With Battery Energy Control Module A. Review likely symptoms, causes, safety considerations, and a sensible diagnostic order.U011ALost Communication With Exhaust Gas Sensor Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU011A concerns lost communication with exhaust gas sensor module a. Learn what this fault indicates and where to begin diagnosis.U011BLost Communication With Rocker Arm Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU011B concerns lost communication with rocker arm control module a. Learn what this fault indicates and where to begin diagnosis.U011CLost Communication With Rocker Arm Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU011C concerns lost communication with rocker arm control module b. Learn what this fault indicates and where to begin diagnosis.