My wife's 2013 had a very noticeable rattle that was seemingly coming from the rear passenger door area. It was her car and she never noticed or paid attention to it, but whenever I drove the car it was the first thing I noticed once above 55 mph or so. Finally on a road trip I had her drive and I got into the backseat and put my ear to everything back there. I narrowed it down to something going on beneath the floor in front of the 2nd row passenger side seat. At this point it was still under warranty, so I brought it in and told them the rattle was coming from beneath the floor, assuming that they would otherwise tell me they couldn't duplicate the problem. To my surprise upon picking the vehicle up, they told me they did duplicate the rattle and confirmed it was coming from beneath the floor. Not only that, they fixed the problem, which was a loose wire harness plug that was banging around. They resecured it and we never heard the rattle again.