Quote:
Originally Posted by kch
No, but the air in your tires is. Cold = denser air = less pressure in tire.
Similarly, this is why you should air your tires out a bit before tracking. Once they get up to temperature, you'll gain a few PSIs.
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Cold air shrinks and hot air expands since it got cold out the pressure in your tire rated in PSI went down below the TPMS threshold which is normally a 3-7 PSI range. The light will go off(maybe) after enough driving on them from the friction of the tires on the road heating up the air inside. Just make sure to check you tire pressure in the morning before you leave and then fill them up to whatever is says inside the driver door in the door sill near the latch. Fill it up 1 or 2 psi above this and you should be fine.