[Riker]

I just had a passenger side rear squeak fixed this week. In my case, it was coming from the passenger C pillar. It happened when lighting accelerating from a stop or breaking to a stop, going over a surface that puts torque or twist loads on the chassis.

Turns out it was the same issue Hyperlinkblue mentioned. Dealer fixed it under warranty. They sent it to a local body shop, had to do the 3 spot welds. Completely resolved the issue. A very disappointing flaw though.