I read your post you have a bad auxiliary motor inside the top of the head of the motor is a computer it has no bearing on canbus it will not code when it goes bad the motor is not cheap and the only one that sells it is the dealer. If the board is bad in the motor it is not able to be rebuilt it was made overseas and was changed by yale to a parker motor and pump assemble. l had this same problem about a year ago. Hope this helps.