I'm getting a very persistent buzz from the rear of the car over bumps. I know it's not the license plate because I took that off the car & still heard it.

Could it be the jack (or the plastic storage area)in the right rear ??

What about the rear parcel shelf ??

It's driving me nuts & seems to be getting worse!

 

Try checking out the rear deck area next to the speakers.. mine rattle like crazy over some bumps..

also, did you get your sunroof fixed yet??