Well we had -4 temps the other night and a high of +4 yesterday. As soon as I got out of the driveway, the TPMS started alerting me to the fact that I had a flat tire. Of course I didn't but due to the extreme cold my TPMS was reading low anyway. Today I checked and added air to all the tires, and after about 3 miles I finally got the nag screen to cancel. Phew! I knew it had to be cold related but I was worried I was going to have to bring it back to the dealer. I thought yesterday that just driving would heat everything up enough to cancel it but apparently I really needed to add that extra 2 lbs of air to each tire.