My 2013 started doing this the last month. A half hour on the highway and the light comes on. Checked and the tire pressure was fine all the way around.
Last time I was doing a 2 hour drive. It came on after a half hour, then turned off after 20 minutes. Didn't see it the rest of the trip. This happened the day after Discount Tire checked the pressure and it was fine, but they bumped all 4 to 35 lns since I had been driving 20 minutes to get there. But all 4 were at 33 when I got there. The light was out though, after sitting overnight, which has been typical.