This computer on wheels require a superior level of expertise that I'm afraid isn't yet available through the regular customer service channels. I think the dealerships aren't fully prepared either.
For this problem I was told by OnStar to go back to my dealership. I called them and they said to call OnStar.
I've emailed MyVolt for some advise such as the precise part number, or specific requirement I need to communicate to my dealer to fix this problem. No feedback yet, and my appointment is on Friday. I'm afraid it will be a waste of time.