With the winter season upon us and decreasing air temperatures the norm, TPMS lights are flashing! There are several reasons why tire pressure may change:
1) Tire damage
2) Slow leaks
3) A drop in outside (ambient) air temperature. For every 10 degrees of temp drop, tires lose 1lb of pressure.
4) Tires deflate naturally over time - as much as 1.5 lbs. per month!

Given enough time and temperature drop , it`s not uncommon for the TPMS system to alert the vehicle operator that the tire pressure is low!