2021 denali

2021 Denali. Same problem here. Took to dealership about two weeks ago and was told it was a “coil” (I’m a woman and of course fell for this) but a week later mine has started giving me the same alert. Nonstop. I also have an issue with my buttons on back of steering wheel to change stations. Works sometimes. Doesn’t sometimes. When talking on the phone thru the car - sounds like someone is underwater.