Well, I'm at an absolute loss. My 2015 Tahoe LT (6spd Auto, 5.3L) not only has the cabin noise issue that is making eveyone sick and irritated in my family but I also have the low idle to the point of shaking the Tahoe and hard shifting at low speeds issues. Took me forever to finally pull the trigger on a vehicle at this price point and I can't believe what I'm going to have to go through now. With the noise, it's undriveable for my family. It's going into the shop for the 2nd time on Monday. The first time I took it in, I hadn't researched the issue and almost thought I would get laughed off the lot because they might think I'm nuts. Now I at least know my sanity is intact.
I got this because I rent 2 - 3 Tahoes a month and all have been great. They are all responsive through the gears and dont' have any vibration or cabin noise. Then, I get home and get in mine and can't belive how bad it is. This will simply be trip #2 but at least I'm educated on the issue now. I will most certainly be looking for a buy back if this isn't resolved as I can't even get my family to ride in my family vehicle.