since cold weather the warning light for tire pressure has started coming on my 2007 Jeep Patriot .?

[LOIS P]

I have checked the pressure in all tires and seems fine.

[spongebobrogers]

Yep, all the new vehicles with electronic tire pressure gauges will do this. Check the pressure and make sure it is close to normal. If it seems to be checking out fine don't worry. My truck does this all the time first thing in the morning when it has been parked on the cold ground or concrete all night. B/c it gets so cold the tire pressure automatically reads less. It should rise as you drive it, and the light will then go off or probably be off when you restart the vehicle later. We don't have a garage so once the weather gets close to freezing the light comes on often.

[Mike J4768]

As it gets colder you lose air pressure. 1 PSI for every 10 degrees of temperature drop. So in the winter time you need to add air to the tires to keep your pressure up. The reason that the previous posters lamp goes off is they are right at the threshold of the lamp coming on and when driving the tires warm up and the pressure rises.

[doane_nut6408]

Check them cold, not after driving.
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