TPMS Light Coming On in Cold Weather? Here’s Why
If your TPMS (tire pressure monitoring system) warning light goes on during a cold snap, it may not mean your tire has a leak.
Tire pressure can decrease about 1 PSI (pounds per square inch) for every 10 degrees the temperature drops. It's not due to air escaping, but rather the air inside the tire condenses, taking up less space when it's cold. This is temporary, because driving will heat up the tire and increase the tire's pressure.
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. Whenever your TPMS light comes on, have your air checked and bring your tires up to the proper pressure.
Winter Tire Pressure
Temperature changes overnight or from cold winter days can affect your tire pressure. This can cause the low-pressure indicator to appear. Large swings in temperature between day and night can affect the pressure in your tires by up to 10 PSI.
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.
One More Reason Your TPMS Light May Go On
Your TPMS light may flash if your vehicle’s onboard computer can’t detect the sensor because you’re using a spare tire. They typically don’t have TPMS sensors.
How to Get Winter Tire Pressure Right
Once a month, have your pressure checked when the tires are cold (meaning the car is parked outside and hasn’t been driven in four hours) and inflate them to what’s indicated on your placard located on the inside of your car door.
For more information regarding TPMS with your vehicle, please review your owner’s manual.