U0004 Code: Meaning, Causes, and Symptoms | OBD2 Codes
U0004 – High Speed CAN Communication Bus (+) Low
U0004 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
High Speed CAN Communication Bus (+) Low is the generic description for the U0004 code, but the manufacturer may have a different description. Currently we have no further information abouth the U0004 OBDII code.