I doubt anyone got this resolved ...I had to go through Cadillac to get the TSB work done since the dealer could not replicate it. It's interesting yours started at 20k miles...almost everyone had this issue from the beginning. If this is happening consistently and can be replicated then take it...
What is your in service date for the 4 year B2B? I am thinking of doing the same but my main concern was the engine, the 6 year/70k power train should cover that though.
Actually my service director at the dealer found out it was loose...just snapped the outer edge back in after adjusting the gimbal all the way in ...idk may have happened when the dealer swapped the body colored mirror caps to the black ones
Just as an update just found that the drivers side mirror glass was not properly attached to the adjusting gimble behind it and that may be causing the creaking buzzing...I don't hear it any more after fixing it...but who knows it may come back.
Thanks @Sully ...I have heard of issues they have had with their 3rd party vendors and delays etc. Was curious about their bolt on packages and tuning.
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