I have had consistent problems with the radio. It shuts off, and all power to the radio is lost including the lights, when you go over a bump, railroad tracks, put your turn signals on, or turn the wheel to the left or right. I was told the radio had an 'internal defect'. After the fifth radio was installed I don't think this is the problem.
I lost all my dashboard lighting and it had to be replaced.
The heater does not work in speeds 1 and 2. It is stuck in the "open" position and will cost $135.00 to fix.
The Body System Module has been replaced twice, because it shorts out.
Anything that has any wiring in or near the steering column has shorted out or does not work at all. It goes into the shop every six months and apparently no one at GM can figure out what is wrong with it, or how to properly fix it.