I am writing to notify you about a problem with the transmission in 2015 GMC Yukon XL. GM is aware of a problem. They issued an internal notice to dealers in February 2016. However, they have not notified to owners in the form of a recall. On several occasions, my vehicle jumped forward, while driving in the city, when it was stopped, in drive, with brake engaged. I reported transmission problems to my local dealer but they repeatedly ignored my concerns. They kept giving excuses that didn't make sense. I finally pressed on, refused to take my vehicle back and reported the problem to several executives. The problem was finally diagnosed under different conditions as stated in the first internal document in March 2016. There was a problem with the transmission. They finally replaced the transmission for "one that didn't have a problem". GM admitted there are problems with transmissions and the problem has been corrected in newer vehicles. They have yet to issue a notice to current owners that their vehicles are at risk. I owned a 2015 GMC Yukon XL but chose to sell it over safety concerns and lack of appropriate response from GM corporate. With 2 young children, I spend a lot of time around schools (like most owners of large GM vehicles). I could have injured or killed someone. I feel it is my obligation to bring this situation to your attention. If you intervene, you can help to avoid any injuries in the future. It is clear that GM will not voluntarily protect the public.

- Stowe, VT, USA

When the car is at idle in drive it becomes very rough (fluctuates up and down). This happens on and off and I have no check engine light on. Sometimes the car even feels like it is going to stall out. I have had it into the dealer and they admitted they feel it as well. They tried adjusting the motor mounts and that did not do it. After having in the dealer for several days they called me and said they can't find the issue. They told me they went into another 2015 GMC Yukon sle and started feeling the same issue. It was stated to me I might have to wait for more complaints on the vehicle to get to the root of the issue. It continues to idle roughly and I want to get this resolved.

- Winter Park, FL, USA

I have a 2015 Yukon denali and I was driving 65 on the highway and the engine shut down completely. A warning message said engine power failure. I had 4 cars and an 18 wheeler behind me at the time. I managed to put the vehicle in neutral and coast to the side of the road onto a median. It was towed to the dealership where they started trying say it might have been bad gas. Then I was told I cracked valve and they already had one other just like this, then 1 day later after a tech level 2 and a shop forum looked at it, and a conversation with a GM pac rep, GM approved a complete engine replacement! I was shocked. I've had the same 4-wheel drive issues everyone else has. I've also had A/C problems, steer wheel popping noises, sunroof loud wind noises. My seat shifts when I drive it. The A/C seats don't cool properly, which I found out when they put me in a loaner Yukon that worked fine. The speedometer gauge also didn't work for 2 days, which I have a picture of and received a warning ticket for when I was pulled over by an officer not knowing what speed I was going. I passenger step guard doesn't always retract properly. My unit was purchase May 2014 and was one of the first 4 X 4 units that was produced and has had constant problems. GM keeps denying a buyback, then no trade assistance, then now has offered an extended warranty. This particular vehicle I have is not safe for my family to be riding in. I can't trade it in or sell it to anyone else knowing the problems it has. The dealer won't even take it because they know the problem that they are dealing with.

- Spring Branch, TX, USA