My 2015 Suburban with 8200 miles had the XM reception quit. The dealer pulled the wiring apart and said it was a cable and antenna problem. I am still waiting for the replacement parts to arrive. It went to the dealer on the 4th of February and am still waiting. As of now, no XM, no Onstar and no GPS nav. I am not real happy with my $70,000 vehicle.

 

Try the Chevrolet customer service line.
1 (800) 222-1020