Thank you! I also had this issue on 2018 - so incredibly annoying. I am still on the hunt for several other rattles/vibrations, but this one seems to be gone now. Sounded like a jet turbine winding down. Thanks again to all that helped identify this issue!!Hey all, I know this is an old thread but I thought I'd bump it because it helped me out a lot.
2016 2.5i Premium here. As the weather got colder this season I started noticing a vibration / rattle that appeared to be coming from behind the gauge cluster. It was usually between 20 and 40mph, between 1100 and 1600 RPMs, only present in Drive, and always more present on cold days and in the first 20 minutes of driving before the car is fully warmed up.
I HATE rattles, especially on new cars that shouldn't have them, and this was making me crazy! I spent hours driving around trying to locate the problem with no success. I found myself not wanting to drive because I didn't want to think about the problem any more.
I was reluctant to take it to the dealership since I've done a bunch of interior / dash work and assumed that they'd blame the rattle on the cabling and the dash / headliner disassembly work I did for my extra 12v switch, backup cam switch and dashcam install.
Anyway, I started searching for posts about similar problems, and found this thread, and the problem identified here was definitely my problem. As soon as I moved the transmission ground cable away from the air box, the problem was totally resolved.
I thought I'd bump it and post some pics and details in case anyone is new to this issue for the cold weather that's starting to come on.
The offending wire is in the engine bay against the firewall near the center. (pic 1). It's a red-black ground wire connecting the transmission to the frame. (pics 2 and 3). It rattles against the black plastic air intake ducting. (pic 4)
I suggest unclipping the nearby gray wiring connector and re-routing the ground wire to underneath the connector instead of over (pic 5). This will keep it from ever vibrating against the air box.
Hope this helps someone as much as it helped me, and many thanks to all the folks who worked hard to find this solution last winter. I never would have guessed that a rattle that seemed like it was coming from behind the speedometer was a wire in the engine bay.