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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

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 6937–6960 of 8256

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U0040Vehicle Communication Bus B (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0040 concerns vehicle communication bus b (+) low. Learn what this fault indicates and where to begin diagnosis.U0041Vehicle Communication Bus B (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0041 concerns vehicle communication bus b (+) high. Learn what this fault indicates and where to begin diagnosis.U0042Vehicle Communication Bus B (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0042 concerns vehicle communication bus b (-) open. Learn what this fault indicates and where to begin diagnosis.U0043Vehicle Communication Bus B (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0043 concerns vehicle communication bus b (-) low. Learn what this fault indicates and where to begin diagnosis.U0044Vehicle Communication Bus B (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0044 concerns vehicle communication bus b (-) high. Learn what this fault indicates and where to begin diagnosis.U0045Vehicle Communication Bus B (-) shorted to Bus B (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0045 concerns vehicle communication bus b (-) shorted to bus b (+). Learn what this fault indicates and where to begin diagnosis.U0046Vehicle Communication Bus CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0046 concerns vehicle communication bus c. Learn what this fault indicates and where to begin diagnosis.U0047Vehicle Communication Bus C PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0047 concerns vehicle communication bus c performance. Learn what this fault indicates and where to begin diagnosis.U0048Vehicle Communication Bus C (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0048 concerns vehicle communication bus c (+) open. Learn what this fault indicates and where to begin diagnosis.U0049Vehicle Communication Bus C (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0049 concerns vehicle communication bus c (+) low. Learn what this fault indicates and where to begin diagnosis.U0050Vehicle Communication Bus C (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0050 concerns vehicle communication bus c (+) high. Learn what this fault indicates and where to begin diagnosis.U0051Vehicle Communication Bus C (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0051 concerns vehicle communication bus c (-) open. Learn what this fault indicates and where to begin diagnosis.U0052Vehicle Communication Bus C (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0052 concerns vehicle communication bus c (-) low. Learn what this fault indicates and where to begin diagnosis.U0053Vehicle Communication Bus C (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0053 concerns vehicle communication bus c (-) high. Learn what this fault indicates and where to begin diagnosis.U0054Vehicle Communication Bus C (-) shorted to Bus C (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0054 concerns vehicle communication bus c (-) shorted to bus c (+). Learn what this fault indicates and where to begin diagnosis.U0055Vehicle Communication Bus DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0055 concerns vehicle communication bus d. Learn what this fault indicates and where to begin diagnosis.U0056Vehicle Communication Bus D PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0056 concerns vehicle communication bus d performance. Learn what this fault indicates and where to begin diagnosis.U0057Vehicle Communication Bus D (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0057 concerns vehicle communication bus d (+) open. Learn what this fault indicates and where to begin diagnosis.U0058Vehicle Communication Bus D (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0058 concerns vehicle communication bus d (+) low. Learn what this fault indicates and where to begin diagnosis.U0059Vehicle Communication Bus D (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0059 concerns vehicle communication bus d (+) high. Learn what this fault indicates and where to begin diagnosis.U0060Vehicle Communication Bus D (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0060 concerns vehicle communication bus d (-) open. Learn what this fault indicates and where to begin diagnosis.U0061Vehicle Communication Bus D (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0061 concerns vehicle communication bus d (-) low. Learn what this fault indicates and where to begin diagnosis.U0062Vehicle Communication Bus D (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0062 concerns vehicle communication bus d (-) high. Learn what this fault indicates and where to begin diagnosis.U0063Vehicle Communication Bus D (-) shorted to Bus D (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0063 concerns vehicle communication bus d (-) shorted to bus d (+). Learn what this fault indicates and where to begin diagnosis.