I have a new Silverado that is giving me fits over the XM radio, it will only pick up the preview channel and the weather and traffic, it was working then it quit, started and finally quit again, XM customer no service says everything is fine on there end. The dealer says nothing is wrong with the radio. If I try to get on a station the radio says channel unauthorized or no categories enabled. When I go to the radio and select categories the only one it shows is weather and traffic. I'm lost hoping maybe some one has a answer, because XM is useless. Guess I'm just gonna cancel and be done with it.