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 8377–8400 of 9253

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U0438Invalid Data Received From Trailer Brake Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0438 concerns invalid data received from trailer brake control module. Learn what this fault indicates and where to begin diagnosis.U0439Invalid Data Received From All Terrain Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0439 concerns invalid data received from all terrain control module. Learn what this fault indicates and where to begin diagnosis.U043AInvalid Data Received From Suspension Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU043A concerns invalid data received from suspension control module b. Learn what this fault indicates and where to begin diagnosis.U043BInvalid Data Received From Front Distance Range Sensor - LeftCheck soonNetwork & Communication45–120 minutes for initial diagnosisU043B concerns invalid data received from front distance range sensor - left. Learn what this fault indicates and where to begin diagnosis.U043CInvalid Data Received From Front Distance Range Sensor - RightCheck soonNetwork & Communication45–120 minutes for initial diagnosisU043C concerns invalid data received from front distance range sensor - right. Learn what this fault indicates and where to begin diagnosis.U043DInvalid Data Received From Accelerator Pedal ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU043D concerns invalid data received from accelerator pedal module. Learn what this fault indicates and where to begin diagnosis.U043EInvalid Data Received From Vacuum Sensor ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU043E concerns invalid data received from vacuum sensor a. Learn what this fault indicates and where to begin diagnosis.U043FInvalid Data Received From Vacuum Sensor BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU043F concerns invalid data received from vacuum sensor b. Learn what this fault indicates and where to begin diagnosis.U0440Invalid Data Received From Pedestrian Alert Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0440 concerns invalid data received from pedestrian alert control module. Learn what this fault indicates and where to begin diagnosis.U0441Invalid Data Received From Emissions Critical Control InformationCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0441 concerns invalid data received from emissions critical control information. Learn what this fault indicates and where to begin diagnosis.U0442Invalid Data Received From ECM/PCM BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0442 concerns invalid data received from ecm/pcm b. Learn what this fault indicates and where to begin diagnosis.U0443Invalid Data Received From Body Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0443 concerns invalid data received from body control module b. Learn what this fault indicates and where to begin diagnosis.U0444Invalid Data Received From Body Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0444 concerns invalid data received from body control module c. Learn what this fault indicates and where to begin diagnosis.U0445Invalid Data Received From Body Control Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0445 concerns invalid data received from body control module d. Learn what this fault indicates and where to begin diagnosis.U0446Invalid Data Received From Body Control Module ECheck soonNetwork & Communication45–120 minutes for initial diagnosisU0446 concerns invalid data received from body control module e. Learn what this fault indicates and where to begin diagnosis.U0447Invalid Data Received From Serial Data Gateway Module ACheck soonNetwork & Communication45–120 minutes for initial diagnosisU0447 concerns invalid data received from serial data gateway module a. Learn what this fault indicates and where to begin diagnosis.U0448Invalid Data Received From Serial Data Gateway Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0448 concerns invalid data received from serial data gateway module b. Learn what this fault indicates and where to begin diagnosis.U0449Invalid Data Received From Serial Data Gateway Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU0449 concerns invalid data received from serial data gateway module c. Learn what this fault indicates and where to begin diagnosis.U044AInvalid Data Received From Serial Data Gateway Module DCheck soonNetwork & Communication45–120 minutes for initial diagnosisU044A concerns invalid data received from serial data gateway module d. Learn what this fault indicates and where to begin diagnosis.U044BInvalid Data Received From Battery Energy Control Module CCheck soonNetwork & Communication45–120 minutes for initial diagnosisU044B concerns invalid data received from battery energy control module c. Learn what this fault indicates and where to begin diagnosis.U044CInvalid Data Received From Hybrid/EV Battery Inductive Charging ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU044C concerns invalid data received from hybrid/ev battery inductive charging module. Learn what this fault indicates and where to begin diagnosis.U044DInvalid Data Received From Generator B Control ModuleCheck soonNetwork & Communication45–120 minutes for initial diagnosisU044D concerns invalid data received from generator b control module. Learn what this fault indicates and where to begin diagnosis.U044FInvalid Data Received From Mirror Control Module BCheck soonNetwork & Communication45–120 minutes for initial diagnosisU044F concerns invalid data received from mirror control module b. Learn what this fault indicates and where to begin diagnosis.U0451Invalid Data Received From Serial Data Gateway Module ECheck soonNetwork & Communication45–120 minutes for initial diagnosisU0451 concerns invalid data received from serial data gateway module e. Learn what this fault indicates and where to begin diagnosis.