Why your tire pressure warning light turns on during cold weather

If you live in Michigan, you have probably noticed your tire pressure warning light turning on through the winter months. But is your tire actually in need of air?

The cold weather can play some tricks with your TPMS (tire pressure monitoring system), but don't panic -- it could be nothing.

Here's some insight from Les Schwab Tire Center:

Tire pressure can decrease about 1 PSI (pound per square inch) for every 10 degrees the temperature drops. It's not that more air is escaping your tires, but rather the air inside the tire condenses, taking up less space when it's cold. It's similar to how a cake, just out of the oven, flattens out a bit as it cools.

Tires also lose about 1 PSI per month just from seepage of air around the edge of the rim and through the tread itself.

These two factors combined can cause the air pressure in a tire to go 25 percent below the recommended fill pressure. This is what triggers the sensing transmitters inside your tires to illuminate your TPMS dash light.

Temperature changes outside affect your tire pressure. If it gets up to 45 degrees by day and drops to 15 degrees at night, your tire pressure will vary 3 PSI, not counting normal air loss. This is why it’s not unusual to have the low-pressure indicator light go on first thing in the morning, since it’s usually coldest overnight.

The light may shut off on its own after you drive 20 minutes or so, as the air in your tires warms and expands and proper inflation level stabilizes.

Regardless, you should get your air checked right away. The TPMS light means your tires are at least 25 percent below the proper air pressure. This is a safety risk, especially if you’re carrying a load close to your vehicle’s max capacity. There’s a greater chance of tire failure, compromised handling and increased wear and tear on your tires. Your gas mileage could also suffer.

When you top off your tires, the TPMS light will go off as the tire regains the proper pressure.

Note: If the warning light is flashing, this is a problem with the vehicle’s TPMS system, not your tires, and you should take your car to the shop.

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