failure

My factory Nav stopped working last weekend. CAL is displayed in the dash display and GPS displays on the NAV screen with a red line through it. I can't find any settings to run a calibration. Is there a process or do I have to take it in for service?

2016 Yukon XL- get intermittent warning of "failure left front turn signal" with rapid flashing on turn signal use - hazards are fine.- left turn signal flashing normally but rapidly. Does not happen all the time, but now almost all the time a I use signal. Obviously not the bulb or LED. OF...

hello all. I have been searching on here and only finding bits and pieces. I would like to know if a malfunction in the transmission can cause problems with the A/C system... Or vice versa. the back story. I saved a 96 jimmy from the wrecking yard june 2012 from a friend of an acquaintance...