[Bubba]

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.

Yeah at 1800 rpm’s … it’s really annoying

 

[Bubba]

Car is going to dealership today, will let you know what they find.

Update: Dealership didn't find any smoking gun but says there is a GM Bulletin about it, listing no cause determined or solution available.

Was told the same by the dealer also :/