[Gigi21413]

Has anyone experienced any speaker reverb?
Speakers will occasionally/randomly just start a deep reverberation that shakes the mirror. I have had it happen on FM, XM, BT.
Bass setting does not make a difference nor does volume level and adjusting volume does not change the loudness of the reverb. It will even continue if you mute the speakers.
Duration is from a few milliseconds to a couple minutes.

Same issue here! After taking car to dealership with no resolution , I Called GM corporate and now have an escalated ticket with them for a resolution . I bought this car for my son and after a 5 minute ride with him I was ready to jump out of my skin! I will push this issue with them to fix ASAP they had no issue taking my 27k they fix or LEMON will be enforced