Recently my 2003 Dmax 2500HD 15,000 miles lost all power to the drivers side door panel - windows,mirror control, heated seats. locks everything. I checked all fuses then it started to work OK. Drove it a day, shut it down over nite, then it did it again. After 4 hours being parked now every thing is OK again! HELP Any ideas anyone??? I am reluctant to take it to the dealer because I recently had the Banks Six Package installedhttp://dieselplace.com/forum/smileys/Disapprove.gif

Perhaps its a bad door module. I have heard of a few giving trouble.

It sure does sound like a door module. I have had the module go in both my wife's Tahoe, and my Duramax. Both did about the same thing, for a week then quit all together.