Low tire pressure + extreme cold conditions

Greetings from ****ty cold Anchorage, Alaska!
So I was driving around a little while ago and I got the low tire pressure warning go off. It gave me the typical spiel on slowing down to a stop and checking my flat tire. The thing is that my tires all seems properly inflated and am wondering if the cold could be screwing with the pressure? I tried pulling over to put some air in the tire but 1) we use carbon dioxide here and it isn't like traditional air pumps 2) it was -4 out.
Thanks!

It's very likely the temps. If you set your pressures at 50°F by 0°F you will be down by 8psi. Which is enough to trigger the TPM warning. Nitrogen is better when it comes to pressure dropping but I am not sure how much better.

If you checked all 4 tires and they are OK then I would just re-initialize the tire pressures in iDrive:

iMenu > Vehicle Settings > FTM > start the car and drive around for 5 to 10 min before the next step becomes available > Set Tire Pressure > Yes > you will see an "Initializing" message

Details are in the owner's manual. (page 88-89 in my manual for an '06 650i)

You might have a cracked wheel, if you still have the OEM Ellipsoids. Does one tire seem to loose pressure when it starts getting colder during winter? If so, that might be a cracked wheel, or just old winter cold!

Thanks for the replies.
This is my first time in REAL winter since I bought her last year.
HerbP I'm not sure I can answer because it's the first time I got that message. I do mean to buy some tires, notably snow tires, but it has yet to really snow. This is weird for Alaska.

Sent from my MB855 using Bimmer App

Global Warming!

Do you have run-flats? With those tires it's more difficult to see if they have a leak. Indeed an instant temp change has influence on the pressure too.

I hope you park her indoores...
I use to live in North Dakota. Gets dam cold there (I remember one time there where the high did not get above zero for over a month)... and if Alaska is anytrhing like ND...
Its easy to break a seal on a tire (tire & rim) and get a flat.
You might want to consider a block heater, battery blanket to keep the car healthy...