The rattle might be coming from the center stack surround, at the bottom where it meets the climate controls...some of us have carbon fiber, piano black wood or one of the walnut or ash woods. Our 2016 G550 and 2017 G63 both had a rattle similar to what you are describing!

On the bottom of the center stack surround, we used a combo of some felt tape and silicone caulking (felt from the MBZ dealer, they just gave us some, but you can get it at an Auto part store or fabric/sewing store). We just kind of filled in underneath the bottom of the center stack. Did not have to remove anything and took the rattle away almost entirely!

We have had a lot of cars, including 5 current/modern Rolls-Royce, 4 current Bentleys and easily 25 Mercedes, 20 BMWs, 3 Porsches, 5 Range Rovers, Audi, Lexus.....and NO other car has as many interior rattles and noises as the G-Class. I'm sure the 2019 (hopefully) will address this, but for a car that is $125-200,000+ it is crazy how rattle laden they are. But, it is The G. It is one of the many quirks!!

I have attached a pic from my car, to show you where I am talking about. If you don't understand, I can try and take another pic. It is HOT and dark in the garage. I wanted to get in and out. LOL

Thanks for the tip! I also hear this in my 2018

Will try this and report back.

There also seems to be an intermittent rattle behind the instrument cowl (the hump that faces the windscreen). I hear it on really bump roads, but thank god most of time it is not not rattling.

if its a 2016 its still under warranty. let the dealership worry about it.

Dear all, I bought a second hand g500 2016 and I would like to foil the wood trims (radio, gear lever surroundings and door) does anyone of you know if they are only popped in or if I need to unscrew something ? Thank you !