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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 6913–6936 of 8256

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U0016Medium Speed CAN Communication Bus (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0016 concerns medium speed can communication bus (-) low. Learn what this fault indicates and where to begin diagnosis.U0017Medium Speed CAN Communication Bus (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0017 concerns medium speed can communication bus (-) high. Learn what this fault indicates and where to begin diagnosis.U0018Medium Speed CAN Communication Bus (-) shorted to Bus (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0018 concerns medium speed can communication bus (-) shorted to bus (+). Learn what this fault indicates and where to begin diagnosis.U0019Low Speed CAN Communication BusCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0019 concerns low speed can communication bus. Learn what this fault indicates and where to begin diagnosis.U0020Low Speed CAN Communication Bus PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0020 concerns low speed can communication bus performance. Learn what this fault indicates and where to begin diagnosis.U0021Low Speed CAN Communication Bus (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0021 concerns low speed can communication bus (+) open. Learn what this fault indicates and where to begin diagnosis.U0022Low Speed CAN Communication Bus (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0022 concerns low speed can communication bus (+) low. Learn what this fault indicates and where to begin diagnosis.U0023Low Speed CAN Communication Bus (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0023 concerns low speed can communication bus (+) high. Learn what this fault indicates and where to begin diagnosis.U0024Low Speed CAN Communication Bus (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0024 concerns low speed can communication bus (-) open. Learn what this fault indicates and where to begin diagnosis.U0025Low Speed CAN Communication Bus (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0025 concerns low speed can communication bus (-) low. Learn what this fault indicates and where to begin diagnosis.U0026Low Speed CAN Communication Bus (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0026 concerns low speed can communication bus (-) high. Learn what this fault indicates and where to begin diagnosis.U0027Low Speed CAN Communication Bus (-) shorted to Bus (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0027 concerns low speed can communication bus (-) shorted to bus (+). Learn what this fault indicates and where to begin diagnosis.U0028Vehicle Communication Bus ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0028 concerns vehicle communication bus a. Learn what this fault indicates and where to begin diagnosis.U0029Vehicle Communication Bus A PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0029 concerns vehicle communication bus a performance. Learn what this fault indicates and where to begin diagnosis.U0030Vehicle Communication Bus A (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0030 concerns vehicle communication bus a (+) open. Learn what this fault indicates and where to begin diagnosis.U0031Vehicle Communication Bus A (+) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0031 concerns vehicle communication bus a (+) low. Learn what this fault indicates and where to begin diagnosis.U0032Vehicle Communication Bus A (+) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0032 concerns vehicle communication bus a (+) high. Learn what this fault indicates and where to begin diagnosis.U0033Vehicle Communication Bus A (-) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0033 concerns vehicle communication bus a (-) open. Learn what this fault indicates and where to begin diagnosis.U0034Vehicle Communication Bus A (-) LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0034 concerns vehicle communication bus a (-) low. Learn what this fault indicates and where to begin diagnosis.U0035Vehicle Communication Bus A (-) HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0035 concerns vehicle communication bus a (-) high. Learn what this fault indicates and where to begin diagnosis.U0036Vehicle Communication Bus A (-) shorted to Bus A (+)Check soonNetwork & Communication45–120 minutes for initial diagnosisU0036 concerns vehicle communication bus a (-) shorted to bus a (+). Learn what this fault indicates and where to begin diagnosis.U0037Vehicle Communication Bus BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0037 concerns vehicle communication bus b. Learn what this fault indicates and where to begin diagnosis.U0038Vehicle Communication Bus B PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0038 concerns vehicle communication bus b performance. Learn what this fault indicates and where to begin diagnosis.U0039Vehicle Communication Bus B (+) OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0039 concerns vehicle communication bus b (+) open. Learn what this fault indicates and where to begin diagnosis.