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.

Network & Communication Clear all

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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 241–264 of 1228

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U01B8Lost Communication With Switch Input Module “B”Check soonNetwork & Communication45–120 minutes for initial diagnosisU01B8 concerns lost communication with switch input module “b”. Learn what this fault indicates and where to begin diagnosis.U01B9Lost Communication With Switch Input Module “C”Check soonNetwork & Communication45–120 minutes for initial diagnosisU01B9 concerns lost communication with switch input module “c”. Learn what this fault indicates and where to begin diagnosis.U01BALost Communication With Park Lock/Pawl Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU01BA concerns lost communication with park lock/pawl control module. Learn what this fault indicates and where to begin diagnosis.U01BBLost Communication With Battery Charger Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU01BB concerns lost communication with battery charger control module b. Learn what this fault indicates and where to begin diagnosis.U01BCLost Communication With Charge Air Cooler Coolant Pump BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU01BC concerns lost communication with charge air cooler coolant pump b. Learn what this fault indicates and where to begin diagnosis.U01BDLost Communication With DC/DC Converter Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU01BD concerns lost communication with dc/dc converter control module c. Learn what this fault indicates and where to begin diagnosis.U01BELost Communication with Drive Motor A Clutch ActuatorCheck soonNetwork & Communication45–120 minutes for initial diagnosisU01BE concerns lost communication with drive motor a clutch actuator. Learn what this fault indicates and where to begin diagnosis.U01BFLost Communication with Battery Management Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU01BF concerns lost communication with battery management control module. Learn what this fault indicates and where to begin diagnosis.U0200Lost Communication With Door Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0200 concerns lost communication with door control module b. Learn what this fault indicates and where to begin diagnosis.U0201Lost Communication With Door Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0201 concerns lost communication with door control module c. Learn what this fault indicates and where to begin diagnosis.U0202Lost Communication With Door Control Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0202 concerns lost communication with door control module d. Learn what this fault indicates and where to begin diagnosis.U0203Lost Communication With Door Control Module ECheck soonNetwork & Communication45–120 minutes for initial diagnosisU0203 concerns lost communication with door control module e. Learn what this fault indicates and where to begin diagnosis.U0204Lost Communication With Door Control Module FCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0204 concerns lost communication with door control module f. Learn what this fault indicates and where to begin diagnosis.U0205Lost Communication With Door Control Module GCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0205 concerns lost communication with door control module g. Learn what this fault indicates and where to begin diagnosis.U0206Lost Communication With Folding Top Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0206 concerns lost communication with folding top control module. Learn what this fault indicates and where to begin diagnosis.U0207Lost Communication With Moveable Roof Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0207 concerns lost communication with moveable roof control module a. Learn what this fault indicates and where to begin diagnosis.U0208Lost Communication With Seat Control Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0208 concerns lost communication with seat control module a. Learn what this fault indicates and where to begin diagnosis.U0209Lost Communication With Seat Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0209 concerns lost communication with seat control module b. Learn what this fault indicates and where to begin diagnosis.U020ALost Communication With Moveable Roof Control Module “B”Check soonNetwork & Communication45–120 minutes for initial diagnosisU020A concerns lost communication with moveable roof control module “b”. Learn what this fault indicates and where to begin diagnosis.U020BLost Communication With Door Control Module HCheck soonNetwork & Communication45–120 minutes for initial diagnosisU020B concerns lost communication with door control module h. Learn what this fault indicates and where to begin diagnosis.U020CLost Communication With Wireless Accessory Charging Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU020C concerns lost communication with wireless accessory charging module a. Learn what this fault indicates and where to begin diagnosis.U020DLost Communication With Wireless Accessory Charging Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU020D concerns lost communication with wireless accessory charging module b. Learn what this fault indicates and where to begin diagnosis.U0210Lost Communication With Seat Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0210 concerns lost communication with seat control module c. Learn what this fault indicates and where to begin diagnosis.U0211Lost Communication With Seat Control Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0211 concerns lost communication with seat control module d. Learn what this fault indicates and where to begin diagnosis.