Yes...I get that occasionally. I also get rattles out of the driver's side
back door too. When I talk to the dealer, it was undetectable, of course.

I've read complaints on line from other owners about noise in the TL's. It
is very disappointing. They want to compete with the other luxe brands-- all
of which don't have these problems. Otherwise I love the car, but this could
prevent me from getting another.