Thanks for writing this up.
It gave me the idea that it was a system glitch. I disconnected the battery. Sound and Super Cruise are back! Maybe GM had sent something to the cars that kind of semi-bricked them?
I have a '25 Yukon AT4 Ultimate.
A few days ago the sound stopped working -- no radio, no turn signal, no nothing. I figured it was the amplifier and made a dealer appt for next week.
However I noticed that supercruise is no longer engaging too. Maybe there is a bigger underlying issue.
Anyone...
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