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.
I changed the oil after my pressure went to zero, and oil pressure cane right back up and stayed. Took it to dealer anyway and they say that low oil was cause if problem and if I really wanted, I could change sender and screen but for $400. I opted not to and had ten apply GM tb to replace drivers side valve cover. Also, installed Range chip and sea-foamed intake, fuel and oil. Truck runs much better, with no oil pressure issues for a week. Going to change oil when it gets dark. Took off intake to see what manifold looked like and there's oil puddled up. Catch can is on the way.
Quick update: after sitting for a week, I was able to change the oil and filter today. After changing oil, oil pressure went to 40 psi and stayed there. Drove it about 15 miles to dealership and stayed right around/little bit under 40 psi. Acting nothing like it was before. But I did notice smoke under hard accel and really noticed the black film on condensation out of tailpipe and a ton of carbon on exhaust pipe and bumper. My truck is at 107,770 miles. Is there any chance a dealer would goodwill overhaul or help me out? This thing has consumed oil for a while but there's no way I can afford complete overhaul.
Taking into dealership this week. Hoping for something simple. This thing is consuming a lot of oil and I will be getting a Range chip to turn off AFM. What would a black oily film on the condensation coming out of the tailpipe mean?
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