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)

 

U0004 Description

 

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.