Diagnostic library

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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.

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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 313–336 of 1223

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U0251Lost Communication With Running Board Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0251 concerns lost communication with running board control module b. Learn what this fault indicates and where to begin diagnosis.U0252Lost Communication With Lighting Control Module - Rear BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0252 concerns lost communication with lighting control module - rear b. Learn what this fault indicates and where to begin diagnosis.U0253Lost Communication With Accessory Protocol Interface ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0253 concerns lost communication with accessory protocol interface module. Learn what this fault indicates and where to begin diagnosis.U0254Lost Communication With Remote Start ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0254 concerns lost communication with remote start module. Learn what this fault indicates and where to begin diagnosis.U0255Lost Communication With Front Display Interface ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0255 concerns lost communication with front display interface module. Learn what this fault indicates and where to begin diagnosis.U0256Lost Communication With Front Controls Interface Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0256 concerns lost communication with front controls interface module a. Learn what this fault indicates and where to begin diagnosis.U0257Lost Communication With Front Controls/Display Interface ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0257 concerns lost communication with front controls/display interface module. Learn what this fault indicates and where to begin diagnosis.U0258Lost Communication With Radio TransceiverCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0258 concerns lost communication with radio transceiver. Learn what this fault indicates and where to begin diagnosis.U0259Lost Communication With Special Purpose Vehicle Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0259 concerns lost communication with special purpose vehicle control module a. Learn what this fault indicates and where to begin diagnosis.U025ALost Communication With Special Purpose Vehicle Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU025A concerns lost communication with special purpose vehicle control module b. Learn what this fault indicates and where to begin diagnosis.U025BLost Communication With Special Purpose Vehicle Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU025B concerns lost communication with special purpose vehicle control module c. Learn what this fault indicates and where to begin diagnosis.U025CLost Communication With Special Purpose Vehicle Control Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU025C concerns lost communication with special purpose vehicle control module d. Learn what this fault indicates and where to begin diagnosis.U025DLost Communication With Front Controls Interface Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU025D concerns lost communication with front controls interface module b. Learn what this fault indicates and where to begin diagnosis.U025ELost Communication With Electronic Brake Booster Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU025E concerns lost communication with electronic brake booster control module a. Learn what this fault indicates and where to begin diagnosis.U025FLost Communication With Electronic Brake Booster Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU025F concerns lost communication with electronic brake booster control module b. Learn what this fault indicates and where to begin diagnosis.U0260Lost Communication With Seat Control Switch Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0260 concerns lost communication with seat control switch module a. Learn what this fault indicates and where to begin diagnosis.U0261Lost Communication With Seat Control Switch Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0261 concerns lost communication with seat control switch module b. Learn what this fault indicates and where to begin diagnosis.U0262Lost Communication With Audio Amplifier BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0262 concerns lost communication with audio amplifier b. Learn what this fault indicates and where to begin diagnosis.U0263Lost Communication With Speech Recognition ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0263 concerns lost communication with speech recognition module. Learn what this fault indicates and where to begin diagnosis.U0264Lost Communication With Camera Module - RearCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0264 concerns lost communication with camera module - rear. Learn what this fault indicates and where to begin diagnosis.U0265Lost Communication With Image Processing Sensor ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0265 concerns lost communication with image processing sensor a. Learn what this fault indicates and where to begin diagnosis.U0266Lost Communication With Image Processing Sensor BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0266 concerns lost communication with image processing sensor b. Learn what this fault indicates and where to begin diagnosis.U0267Lost Communication With Image Processing Sensor CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0267 concerns lost communication with image processing sensor c. Learn what this fault indicates and where to begin diagnosis.U0268Lost Communication With Image Processing Sensor DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0268 concerns lost communication with image processing sensor d. Learn what this fault indicates and where to begin diagnosis.