Passenger side (maybe B pillar) rattle, drives me crazy!

[HBM3]

Just came upon this thread wow!! To think all along it was the drive unit. Glad it was resolved for you though 👍.

 

[Camberrynh]

Well, here’s an update… brought the car down to Tesla for the drive unit replacement today. And they decided not to do it. I’m very frustrated! They said they could not duplicate the concern. Even though they did at the last service visit.

 

[turns2stone]

OK, this is may not the cause BUT have you checked to make sure it's not just the seat belt bumping against the B pillar? I had a rattle in my car that bothered me, then I realized it went away when I had someone in the passenger seat, wearing the seat belt. My solution has been to simply keep that seatbelt attached. The rattle has never come back.

Had the same problem on my newly-delivered Model 3. I stuck a piece of black adhesive felt to the back/side of the passenger seat where the seatbelt was hitting. You can also use the fuzzy half of those adhesive velcro strips. Easy to find at a hardware store.