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

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 361–384 of 1228

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U0284Lost Communication With Active Grille Air Shutter Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0284 concerns lost communication with active grille air shutter module a. Learn what this fault indicates and where to begin diagnosis.U0285Lost Communication With Active Grille Air Shutter Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0285 concerns lost communication with active grille air shutter module b. Learn what this fault indicates and where to begin diagnosis.U0286Lost Communication With Radiator Anti Tamper DeviceCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0286 concerns lost communication with radiator anti tamper device. Learn what this fault indicates and where to begin diagnosis.U0287Lost Communication With Transmission Fluid Pump Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0287 concerns lost communication with transmission fluid pump module a. Learn what this fault indicates and where to begin diagnosis.U0288Lost Communication With DC/AC Converter Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0288 concerns lost communication with dc/ac converter control module a. Learn what this fault indicates and where to begin diagnosis.U0289Lost Communication With DC/AC Converter Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0289 concerns lost communication with dc/ac converter control module b. Learn what this fault indicates and where to begin diagnosis.U028ALost Communication With Transmission Fluid Pump Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU028A concerns lost communication with transmission fluid pump module b. Learn what this fault indicates and where to begin diagnosis.U028BLost Communication With Active Grille Air Shutter Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU028B concerns lost communication with active grille air shutter module c. Learn what this fault indicates and where to begin diagnosis.U028CLost Communication With Active Grille Air Shutter Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU028C concerns lost communication with active grille air shutter module d. Learn what this fault indicates and where to begin diagnosis.U028DLost Communication with Active Aerodynamic Feature Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU028D concerns lost communication with active aerodynamic feature control module a. Learn what this fault indicates and where to begin diagnosis.U028ELost Communication with Active Aerodynamic Feature Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU028E concerns lost communication with active aerodynamic feature control module b. Learn what this fault indicates and where to begin diagnosis.U028FLost Communication with Active Aerodynamic Feature Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU028F concerns lost communication with active aerodynamic feature control module c. Learn what this fault indicates and where to begin diagnosis.U0290Lost Communication with Active Aerodynamic Feature Control Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0290 concerns lost communication with active aerodynamic feature control module d. Learn what this fault indicates and where to begin diagnosis.U0291Lost Communication With Gear Shift Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0291 concerns lost communication with gear shift control module b. Learn what this fault indicates and where to begin diagnosis.U0292Lost Communication With Drive Motor Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0292 concerns lost communication with drive motor control module b. Learn what this fault indicates and where to begin diagnosis.U0293Lost Communication With Hybrid/EV Powertrain Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0293 concerns lost communication with hybrid/ev powertrain control module. Learn what this fault indicates and where to begin diagnosis.U0294Lost Communication With Powertrain Control Monitor ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0294 concerns lost communication with powertrain control monitor module. Learn what this fault indicates and where to begin diagnosis.U0295Lost Communication With AC/AC Converter Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0295 concerns lost communication with ac/ac converter control module. Learn what this fault indicates and where to begin diagnosis.U0296Lost Communication With AC/DC Converter Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0296 concerns lost communication with ac/dc converter control module a. Learn what this fault indicates and where to begin diagnosis.U0297Lost Communication With AC/DC Converter Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0297 concerns lost communication with ac/dc converter control module b. Learn what this fault indicates and where to begin diagnosis.U0298Lost Communication With DC/DC Converter Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0298 concerns lost communication with dc/dc converter control module a. Learn what this fault indicates and where to begin diagnosis.U0299Lost Communication With DC/DC Converter Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0299 concerns lost communication with dc/dc converter control module b. Learn what this fault indicates and where to begin diagnosis.U029ALost Communication With Hybrid/EV Battery Pack Sensor ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU029A concerns lost communication with hybrid/ev battery pack sensor module. Learn what this fault indicates and where to begin diagnosis.U029BLost Communication With Drive Motor Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU029B concerns lost communication with drive motor control module c. Learn what this fault indicates and where to begin diagnosis.