Mine is also able to connect to OnStar and they are able to determine where the vehicle is located. The new wrinkle now is the radio is completely out. We drove the truck yesterday on several errands and when we started it after it had sat for about an hour there was no radio. The screen is out, no sound, no backup camera and the buttons are not backlit. Checked this morning and everything is still black. I guess another call to the dealer. I'm hoping it is all related. I'm not getting a good feeling about this truck after 600 miles. I pretty easy going and a loyal GM owner but I am not very happy at this point!