If your TPMS (Tire Pressure Monitoring System) light keeps flickering on and off during the summer months, don’t ignore it—it’s your vehicle’s way of signaling that something’s off. As temperatures rise and fall, especially in areas with fluctuating mountain or desert climates, your tire pressure changes too. Understanding what your TPMS light is really telling you can help you stay safe on the road and avoid premature tire wear or even blowouts.
What Is TPMS, and How Does It Work?
Your TPMS monitors the air pressure in each tire and alerts you when it falls below a certain threshold—usually 25% under the manufacturer’s recommended level. Depending on your vehicle, the system may show a general warning light or specify which tire is low. It’s a great safety tool, but it doesn’t always mean there’s a leak—sometimes, it’s the weather talking.
Summer Heat and Tire Pressure Fluctuations
During summer, pavement temperatures can soar to well over 130°F, especially after your car’s been parked in the sun. This causes the air inside your tires to expand, increasing pressure. Later in the evening, or at higher altitudes, temperatures can drop quickly—causing that pressure to fall. These swings can trigger your TPMS light even if there’s nothing mechanically wrong with your tires.
What to Do When the Light Comes On
If your TPMS light turns on, pull over safely and check your tire pressure using a quality gauge. Compare the reading to the manufacturer’s recommended PSI, which is listed on a sticker inside the driver’s door. If the pressure is too low or high, adjust accordingly. If the light stays on after correction, or if a tire looks visibly deflated, inspect for punctures or damage and visit a shop if needed.
When the Light Goes Off by Itself
If the light comes on in the morning and disappears by afternoon, it may be due to daily temperature fluctuations. Still, it’s a sign that your tires are hovering near the threshold—and that a proper inflation check is due. TPMS sensors are sensitive, and those summer swings can be just enough to trigger a warning.
Final Thoughts
Your TPMS light isn’t just a nuisance—it’s a helpful early warning system. Summer heat can wreak havoc on tire pressure, so take the time to check regularly and respond to those alerts. Staying ahead of pressure changes means better handling, safer driving, and longer tire life all summer long.