I am now officially annoyed with that little tire symbol in the bottom left corner of my dash. There must be better tire sensors on the market to fix that. Everytime it gets frigid, I have to look at that thing!

 

It doesn't have anything to do with the tire sensors. Air contracts when cold - put some more in.

 

Ditto.

When is the last time you checked your tire pressure? If it is correct, then a change in temp will usually not set it off. If low to begin with, as oldjeep said the air will contract which makes it even lower tripping the light.

Next time you take a drive, put the EVIC display on the tire pressure view. After driving, you will see the pressures go up at least 5 psi. That is from heat. Same thing happens when it gets cold out only in reverse, the pressure drops.

 

might be worth switching to nitrogen if it bugs you. Very little contraction with temperature variations.

 

My truck shows the light when cold out sometimes as well. Once I get on the highway and warm up the tires it goes away. It doesnt happen all that much but my truck sits and you lose pressure when things sit. I keep my pressure at 35psi which is a few lbs above spec, so it has to drop like 5lbs before the light will even kick on.


here we go.....
Nitrogen is a gimmick for automobiles. Airplanes it is one thing with severe heat when landing and severe cold when in the air, but for auto's it makes no difference.

Did you know that the atmosphere is made up of 78% nitrogen? So, your getting 78% Nitrogen when you fill up from home! Only 20% is Oxygen.
Also, when you empty all of the air out of your tires to fill up with Nitrogen, the entire cavity is full of atmospheric air and even a complete Nitrogen fill still retains a percentage of Oxygen.
The inconvenience of re-filling a Nitrogen tire with Nitrogen is a hassle, not to mention the ridiculous cost. To each his own I suppose.


There is a way to override the whole TPMS crap. Get your tires set correctly so the TPMS light is off. Remove the TPMS sensors from your wheels and put them in a pressurized canister. Throw the canister under your seat or in your toolbox. You can make one from Schedule40 PVC and it will safely hold up to 180psi.
OR get a small lawnmower or wheelbarrow tire/wheel combo that will safely hold the desired pressure. Toss those suckers in and seal it up!