I have the same problem with my 2021 LT Trailboss. First the 4g did not work, then after 3 weeks in the dealership service department, now it works, but it still won't connect to a wifi... The dealership cannot figure it out & supposedly GM engineering either. In the 4 weeks since I bought it, I've actually had possession of it for 4 days. I am am wits end & getting really ticked off at Chevy!