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.

Network & Communication 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 73–96 of 1228

Most searched first

U0077Control Module Communication Bus E OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0077 concerns control module communication bus e off. Learn what this fault indicates and where to begin diagnosis.U0078Control Module Communication Bus F OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0078 concerns control module communication bus f off. Learn what this fault indicates and where to begin diagnosis.U0079Control Module Communication Bus G OffCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0079 concerns control module communication bus g off. Learn what this fault indicates and where to begin diagnosis.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.