U0040 Code: Meaning, Causes, and Symptoms | OBD2 Codes

U0040 – Vehicle Communication Bus B (+) Low

 

U0040 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

U0040 Description

 

Vehicle Communication Bus B (+) Low is the generic description for the U0040 code, but the manufacturer may have a different description. Currently we have no further information abouth the U0040 OBDII code.