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.

Check soon U · Network 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 73–96 of 1223

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U007AControl Module Communication Bus H OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU007A concerns control module communication bus h off. Learn what this fault indicates and where to begin diagnosis.U007BControl Module Communication Bus I OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU007B concerns control module communication bus i off. Learn what this fault indicates and where to begin diagnosis.U007CControl Module Communication Bus J OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU007C concerns control module communication bus j off. Learn what this fault indicates and where to begin diagnosis.U007DControl Module Communication Bus K OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU007D concerns control module communication bus k off. Learn what this fault indicates and where to begin diagnosis.U007EControl Module Communication Bus L OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU007E concerns control module communication bus l off. Learn what this fault indicates and where to begin diagnosis.U007FControl Module Communication Bus M OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU007F concerns control module communication bus m off. Learn what this fault indicates and where to begin diagnosis.U0080Vehicle Communication Bus FCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0080 concerns vehicle communication bus f. Learn what this fault indicates and where to begin diagnosis.U0081Vehicle Communication Bus F PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0081 concerns vehicle communication bus f performance. Learn what this fault indicates and where to begin diagnosis.U0082Vehicle Communication Bus F + OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0082 concerns vehicle communication bus f + open. Learn what this fault indicates and where to begin diagnosis.U0083Vehicle Communication Bus F + LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0083 concerns vehicle communication bus f + low. Learn what this fault indicates and where to begin diagnosis.U0084Vehicle Communication Bus F + HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0084 concerns vehicle communication bus f + high. Learn what this fault indicates and where to begin diagnosis.U0085Vehicle Communication Bus F - OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0085 concerns vehicle communication bus f - open. Learn what this fault indicates and where to begin diagnosis.U0086Vehicle Communication Bus F - LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0086 concerns vehicle communication bus f - low. Learn what this fault indicates and where to begin diagnosis.U0087Vehicle Communication Bus F - HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0087 concerns vehicle communication bus f - high. Learn what this fault indicates and where to begin diagnosis.U0088Vehicle Communication Bus F - Shorted to Bus F +Check soonNetwork & Communication45–120 minutes for initial diagnosisU0088 concerns vehicle communication bus f - shorted to bus f +. Learn what this fault indicates and where to begin diagnosis.U0089Vehicle Communication Bus GCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0089 concerns vehicle communication bus g. Learn what this fault indicates and where to begin diagnosis.U008AVehicle Communication Bus G PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU008A concerns vehicle communication bus g performance. Learn what this fault indicates and where to begin diagnosis.U008BVehicle Communication Bus G (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU008B concerns vehicle communication bus g (+) open. Learn what this fault indicates and where to begin diagnosis.U008CVehicle Communication Bus G (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU008C concerns vehicle communication bus g (+) low. Learn what this fault indicates and where to begin diagnosis.U008DVehicle Communication Bus G (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU008D concerns vehicle communication bus g (+) high. Learn what this fault indicates and where to begin diagnosis.U008EVehicle Communication Bus G (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU008E concerns vehicle communication bus g (-) open. Learn what this fault indicates and where to begin diagnosis.U008FVehicle Communication Bus G (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU008F concerns vehicle communication bus g (-) low. Learn what this fault indicates and where to begin diagnosis.U0090Vehicle Communication Bus G (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0090 concerns vehicle communication bus g (-) high. Learn what this fault indicates and where to begin diagnosis.U0091Vehicle Communication Bus G (-) shorted to Bus G (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0091 concerns vehicle communication bus g (-) shorted to bus g (+). Learn what this fault indicates and where to begin diagnosis.