Pumper

This has yet to happen on my new truck, but it would happen on my 2009 and 2012. I would go to the car wash when it was cold outside and on the way home the park assist would shut off. Give it a little time and it will come back. I think that this is caused by moisture freezing around them or in them even though there is nothing necessarily visible on the outside.

This is a little unrelated, but can the VCIM out of a 2011 be added to gain the OnStar application use?

The feed to the block is already fused. There is no need to draw directly from the battery unless you are drawing more than 30 amps.

When I owned my 2001 I got a recall notice for this problem. I didn't have the problem so I never took my truck in, but I am pretty sure that GM was going to cover it. I might be worth while for you guys to look into it by calling the dealer.