TPMS Sensors: Why Your Tire Pressure Changes With the Temperature
If you’ve ever noticed your tire pressure light coming on when the weather changes, or its on in the mornings and off by afternoon, you’re not alone. Many drivers think something is wrong with their tires, but in most cases, it’s simply due to temperature changes. Your vehicle’s TPMS (Tire Pressure Monitoring System) is designed to alert you when tire pressure gets too low, and colder or warmer weather can cause pressure to fluctuate more than you might expect.
What Is a TPMS Sensor?
Your vehicle’s TPMS system monitors the air pressure in each tire. Most modern vehicles have a sensor inside each wheel that sends pressure readings to your car’s computer. If the pressure drops below the recommended level, the TPMS warning light will turn on to let you know.
This system helps improve safety, fuel economy, and tire life by making sure your tires stay properly inflated.
Why Tire Pressure Changes With Temperature
Air expands when it gets warm and contracts when it gets cold. Because of this, tire pressure naturally changes with the outside temperature.
As a general rule:
- Tire pressure drops about 1 PSI for every 10°F decrease in temperature
- Tire pressure increases about 1 PSI for every 10°F increase in temperature
This means a cold morning can trigger your TPMS light even if nothing is wrong with your tires.
Why Low Tire Pressure Matters
Driving with incorrect tire pressure can cause several problems, including:
- Increased tire wear
- Poor handling and longer stopping distance
- Lower fuel mileage
- Higher risk of tire failure
Your TPMS system is there to warn you before these problems become serious.
When the TPMS Light Means More Than Temperature Change
Sometimes the warning light is not just from weather changes. You should have your tires checked if:
- The light stays on after adjusting tire pressure
- The light flashes before staying on
- One tire keeps losing air
- You recently had tires replaced or rotated
In some cases, the TPMS sensor itself may need service or replacement, especially in older vehicles.
TPMS Sensors Need Maintenance Too
TPMS sensors have batteries inside them that wear out over time. Most sensors last 5–10 years, depending on driving conditions. If a sensor fails, the warning light may stay on even when the tire pressure is correct or will flash.
Keep Your Tires Safe Year-Round
Temperature changes are normal, but driving with the wrong tire pressure isn’t. Checking your tires regularly and paying attention to the TPMS light can help keep your vehicle safe, improve fuel economy, and extend the life of your tires.
If your tire pressure light is on or you think your TPMS sensors may not be working correctly, our shop can inspect the system and make sure everything is working the way it should.
Sources:
National Highway Traffic Safety Administration (NHTSA)
U.S. Department of Energy – Energy Saver Guide
U.S. Tire Manufacturers Association
Michelin Tire Care Guide
Goodyear Tire Maintenance Tips
Bridgestone Tire Maintenance Guide