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GMC 2500 Denali Tranny slipping in park on hill backwards

Henry Oppermann

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Henry Oppermann New Member

Henry Oppermann

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Posted

I had a strange occurrence last week and not sure what happened. But, it happened that I drove my truck up my driveway, placed the truck in park, turned off the key. I went inside and came back outside to grab the last of my belongings and the truck was halfway in the street. Crap, did I forget to set the park and leave the key on long enough, or did the snow let the truck slip down the hill....?

 

NO! I did it again and thought of this even as a brain fart, and sure enough the next day my wife and I went to dinner, and came back, drove up the drive, set the tranny in park, turned off the key this time waiting a minute, and while sitting there, it rolled backwards about 20 feet down the hill, and this time I hit the brake, started the truck and turned it around and backed it up the drive and set park to see if it did the same thing parked nose down hill. NOPE, all good.


Next day I forgot and quickly dropped off a snowblower to the house and while I turned my back back, the wife yells at me to catch the truck, again rolling down the hill.

I wonder how many other trucks have done this with the blame on the owner. I have 20 K miles on it, 2018 2500HD, and she is going in the shop on Tuesday. Just a heads up, there is something really not right with this picture. I tow a boat and bobcat with her occasionally and not overloaded, and never had a scare like this before. Heads up. Set the brake is my mantra from here on out.  

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