tire pressure sensor?

hello, when it got cold this morning my tire pressure warning light came on
saying my right rear tire was low. i know it's fine and that it's the cold
causing the alarm, will this reset itself? thanks

 

If the tire isn't actually underinflated, yes. According to Hyundai, this
is a normal condition. I'm not so sure, however. The lamp is set to come
on when the tire is about 20% low. Considering the normal variation in
temperature in most areas of the United States, and using the ideal gas
law to estimate, I'd say the normal pressure variation due to cooling to
be about 13%.

The short story is to check your pressures. You probably need to add a
few psi to all the tires.