I purchased a 2015 Yukon Denali in November. Mid December my navigation and GPS system went out. The on star light was red not green. And, the GPS showed me a good 100miles away. Onstar said to go to the dealership. The dealership ordered a new antenna, which had to then get painted. The new antenna was not the answer. The dealership had to order a new part (maybe a module?). However, the part was on backorder . The dealership said this has been an issue. Wow-really! I find this to be very disappointing. Today, my vehicle is getting the new part. I am keeping my fingers crossed.
My other disappointment is the seats are to fold “flat”. Yes they are flat however on a slant. I have had groceries roll out and break upon opening the lift gate. I spoke with a friend who has the 2015 “XL” and he has the same issue. I am hoping I did something incorrectly. Any ideas?