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)
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.