I recently had the same issue on my 2017 Yukon XL with the 5.3L engine. Last year I was stuck about 1k miles from home with my transmission when while waiting at a drive thru. Paid $6k to get it replaced last March (since I got it done at a GMC dealer, it came with a three year/75k warranty)...
I found the TSB for the loose seat this afternoon. It is 18-NA-377 from April 2019. Covers Yukons from 2015-2019. Going to take it to the dealer tomorrow to see if they can get this resolved. Here is the link: https://static.nhtsa.gov/odi/tsbs/2019/MC-10160120-9999.pdf
I have the same issue with my 2017 Yukon XL with the heated leather seats. It seems more pronouned with a sharp left turn. I swear that I can even hear it but no one else can. I have also checked everything and was planning on pulling the seat out but now that I know it isn't just my seat, I...
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