Persistent rattle in rear passenger C pillar

[shigman]

Howdy. I’ve got a really annoying rattle which sounds like it’s coming from the rear passenger C pillar. I’ve messed with the seatbelt, buttoned down the jack and gasoline nozzle, put the seats up and down, banged around on panels to try to localize but nothing seems to help. It’s a 2023 35 truck. Any easy tips for dismantling the panels back there?

 

[HighwaySentinel]

They just pop right off. For a detailed look, here's a video from @SoundsGoodStereo . The info you are looking for starts at 11:40.

 

[shigman]

Sweet, I guess I should have actually done some googling. I hope I find something loose in there, driving me nuts.

 

[HighwaySentinel]

There's a lot of rattling that comes from the rear window assembly. Check there too. The video above shows how to take the trim along the whole back of the cab too. Lots of things in there that can rattle as well.