The Telematics Module failed at 43,000 miles, 2 years. This shut down everything having to do with GPS, Communications, Super Cruise. I got into an accident, which I feel the car would have responded to, before the accident, if this system was working. The warning was the on star, super cruise, communications, warnings didn't work. On the dash a symbol GPS with red circle and line through it was visible. The Chevrolet Dealership diagnosed the problem and is replacing the module, at my expense. If you do a google search on Telematics Module you will find that this issue applies to all GM vehicles and failure rate is right when the manufacturers warranty runs out, 36,000 miles.