Posted 12/5/2012 16:37 (#2734607 - in reply to #2732962) Subject: Re: GM Sierra help (pics)
MN
I had some of the same problems on an 07 Chevy. Took it to dealer 3 times with no fix. Finally found a wire that had worn through underneath the carpet right where your left foot would rest when driving. Very hard to find but is was just below the junction box with the relays and switches are. Might be worth a look if you have not found the problem.