Bought "07 Yukon XL Denali 2 wks ago. Power liftgate will not work with remotes provided. Dealer said it is known problem with all such vehicles and GM has not provided software to reprogram liftgate. Anyone ever hear of or experience this or did the repair mechanic not want to fix?

My 07 Yukon rear lift door works fine with the remote. Can you try another dealer. Can't believe there isn't a way to check for problem.