2016 GMC Sierra 2500 Denali won't move

rws262 · August 17, 2016

Just bought a new '16 Sierra 2500 Duramax Denali on Monday. Has 125 miles on it. Three times now after parking in my driveway, which has a slight uphill grade, I come out and put it in reverse (or drive if I backed in) and it doesn't move. Not an inch. The only way to get it to move is to put it into drive and move 2 inches, then reverse and it will go. It only seems to do that when it is warm. Didn't do it this morning after sitting all night. Does not do this on flat ground.

Am I missing something here?? Does the transmission just need to break in?

Any help is appreciated.

newdude · August 17, 2016

Do you set the park brake? Try setting that before shifting into park, then when you get in it again, hold your foot on the brake, release it and see how it shifts out of park.

There is also the Hill Hold Assist but that only holds the truck for about 1-3 seconds on a hill, although you may possibly be experiencing this.

rws262 · August 17, 2016

Thanks, will try setting the parking brake before shifting into park.

The hill hold assist is turned off.

DBTravelers · August 17, 2016

Once you get it in reverse and can back up, go forward to your dealer. It should not be doing that and they need to fix it for you. I am sure it is an adjustment to the transmission, but it may be a flaw also.