My buddys truck has been doing this of and on and it seams worse when the truck is cold. I have already replaced the prndl switch. I know there was a bulitin from gm for this but i havent worked at a gm dealer ship for the past two years so i cant remember. My buddy also has had it to the local trans shop and they said the internal wiring harnes should be replaced. i have a hard time beliveing that. I have also seen these prndl switchs have a bad wire on them and i didnt see this on his truck. Any help would be awesome. I have no way of getting any of the bulitins or diag info from gm, i will have codes later tonight i will post.

Thanks,

 

It's an intermittent concern if that helps any one I have drove the truck for 2 days no problems.