Diagnostic library

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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

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Severity

All severities9253 Low priority305 Check soon8256 Urgent621

Code family

All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

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These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.

Diagnostic codes

Showing 1057–1080 of 1223

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U3501Control Module Input Power A Circuit LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3501 concerns control module input power a circuit low. Learn what this fault indicates and where to begin diagnosis.U3502Control Module Input Power A Circuit HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3502 concerns control module input power a circuit high. Learn what this fault indicates and where to begin diagnosis.U3503Control Module Input Power A Circuit Intermittent/ErraticCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3503 concerns control module input power a circuit intermittent/erratic. Learn what this fault indicates and where to begin diagnosis.U3504Control Module Input Power B Circuit Range/PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3504 concerns control module input power b circuit range/performance. Learn what this fault indicates and where to begin diagnosis.U3505Control Module Input Power B Circuit LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3505 concerns control module input power b circuit low. Learn what this fault indicates and where to begin diagnosis.U3506Control Module Input Power B Circuit HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3506 concerns control module input power b circuit high. Learn what this fault indicates and where to begin diagnosis.U3507Control Module Input Power B Circuit Intermittent/ErraticCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3507 concerns control module input power b circuit intermittent/erratic. Learn what this fault indicates and where to begin diagnosis.U3508Control Module Input Power C Circuit Range/PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3508 concerns control module input power c circuit range/performance. Learn what this fault indicates and where to begin diagnosis.U3509Control Module Input Power C Circuit LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3509 concerns control module input power c circuit low. Learn what this fault indicates and where to begin diagnosis.U350AControl Module Input Power C Circuit HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU350A concerns control module input power c circuit high. Learn what this fault indicates and where to begin diagnosis.U350BControl Module Input Power C Circuit Intermittent/ErraticCheck soonNetwork & Communication45–120 minutes for initial diagnosisU350B concerns control module input power c circuit intermittent/erratic. Learn what this fault indicates and where to begin diagnosis.U350CControl Module Cooling Fan Circuit/OpenCheck soonNetwork & Communication45–120 minutes for initial diagnosisU350C concerns control module cooling fan circuit/open. Learn what this fault indicates and where to begin diagnosis.U350DControl Module Cooling Fan Circuit LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU350D concerns control module cooling fan circuit low. Learn what this fault indicates and where to begin diagnosis.U350EControl Module Cooling Fan Circuit HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU350E concerns control module cooling fan circuit high. Learn what this fault indicates and where to begin diagnosis.U350FControl Module Cooling Fan Circuit Range/PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU350F concerns control module cooling fan circuit range/performance. Learn what this fault indicates and where to begin diagnosis.U3510Control Module Missing CalibrationCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3510 concerns control module missing calibration. Learn what this fault indicates and where to begin diagnosis.U3511High Voltage System Interlock Circuit BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3511 concerns high voltage system interlock circuit b. Learn what this fault indicates and where to begin diagnosis.U3512High Voltage System Interlock Circuit B PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3512 concerns high voltage system interlock circuit b performance. Learn what this fault indicates and where to begin diagnosis.U3513High Voltage System Interlock Circuit B LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3513 concerns high voltage system interlock circuit b low. Learn what this fault indicates and where to begin diagnosis.U3514High Voltage System Interlock Circuit B HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3514 concerns high voltage system interlock circuit b high. Learn what this fault indicates and where to begin diagnosis.U3515High Voltage System Interlock Circuit CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3515 concerns high voltage system interlock circuit c. Learn what this fault indicates and where to begin diagnosis.U3516High Voltage System Interlock Circuit C PerformanceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3516 concerns high voltage system interlock circuit c performance. Learn what this fault indicates and where to begin diagnosis.U3517High Voltage System Interlock Circuit C LowCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3517 concerns high voltage system interlock circuit c low. Learn what this fault indicates and where to begin diagnosis.U3518High Voltage System Interlock Circuit C HighCheck soonNetwork & Communication45–120 minutes for initial diagnosisU3518 concerns high voltage system interlock circuit c high. Learn what this fault indicates and where to begin diagnosis.