So, my friend has a 2014 GC limited 4X4 with less than 2K miles, and they've been noticing a rattle, which seemed to emanate from the center of the dash.
I got under the vehicle and started tapping around, and I found the forward most skid plate bolt to be very loose. Interestingly enough, the noise was very loud going very slowly down the road, say < 5 MPH, and would disappear when turning right.
Here is a pic.
Here is a vid.