What does the TPMS Light Mean? (And what to do when it comes on?)
The TPMS light (that yellow horseshoe with an exclamation point on your dashboard) means one or more of your tires is at least 25% below its recommended pressure. It's not a horseshoe; it's a cross-section of a tire. And because a tire can be 25% low and still look completely normal, this is one warning light you should never judge by eye.
Here's what triggers it, how to fix it yourself in most cases, and when it's time to have a shop take a look.
[ Updated July 2026 — Empire Repair, Waverly, NE (15 minutes from Lincoln) ]
What is TPMS?
TPMS stands for Tire Pressure Monitoring System. Small sensors, that are usually mounted inside each wheel, constantly measure tire pressure. They also alert you when any tire drops significantly below the manufacturer's recommendation. It's been required on all vehicles sold in the U.S. since 2008, so if your car is newer than that, you have it.
Solid Light vs. Flashing Light: They Mean Different Things
Solid Light means one or more tires is low; check and fill your tires
Flashes for approximately 60-90 seconds at startup and stays on
This distinction matters. A solid light is usually a five-minute fix at a gas station air pump. A flashing light means a sensor has failed — the batteries inside TPMS sensors last roughly 5 to 10 years, and when one dies, the sensor needs to be replaced.
What Triggers the TPMS Light?
Cold weather. Tire pressure drops about 1 PSI for every 10°F the temperature falls. This is why the light loves to appear on the first cold morning of a Nebraska fall — and sometimes turns itself off by lunchtime as the tires warm up. Don't ignore it just because it went away; your tires are still running lower than they were in summer.
A slow leak. A nail, screw, or corroded valve stem can leak air slowly enough that you never notice — until the light does. If your light keeps coming back every week or two after you fill up, you almost certainly have a leak.
A failed sensor. Sensor batteries die with age. If your vehicle is 6+ years old and the light flashes at startup, this is the most likely cause.
A recent tire change. New tires, a rotation, or a swap to winter tires can require the system to be reset or "relearned," depending on the vehicle.
How to Fix it Yourself in 4 Steps
Find your correct tire pressure. Open the driver's door and look at the sticker on the door jamb. That's your target pressure — not the number printed on the tire sidewall, which is the tire's maximum, not the recommendation.
Check all four tires with a gauge. Don’t eyeball it. A significantly low tire can look identical to a properly inflated one.
Check the spare! Some vehicles have a TPMS sensor in the spare tire, and a slowly deflating spare will keep the light on no matter how many times you check the other four.
Fill to the sticker pressure and drive. Most vehicles reset the light automatically after a few minutes of driving above 15 mph. Some require a manual reset — check your owner's manual for a TPMS reset button or procedure.
Why It’s a Safety Light, Not a Suggestion.
Underinflated tires are a safety concern.
Longer stopping distances — low tires flex more and grip less
Faster, uneven tire wear — shortening the life of tires you paid good money for
Worse fuel economy — low pressure increases rolling resistance
Blowout risk — an underinflated tire builds heat, especially at highway speed in summer. Most blowouts trace back to low pressure
Your entire vehicle rides on four contact patches roughly the size of your hand. Pressure is what keeps them working.
When to See a Mechanic
The light returns after you've filled the tires — you likely have a leak, and finding it early is far cheaper than replacing a tire ruined by driving flat
The light flashes at startup — a sensor has failed and needs replacement
The light stays on after airing up and driving — your vehicle may need a manual relearn procedure
You're not sure — checking a TPMS light takes us about five minutes, and we do it free--not free to diag. Tire pressure we will adjust for free.
Frequently Asked Questions
Can I drive with the TPMS light on? Short distances at moderate speed, likely yes, but check your pressure as soon as possible. If the tire is visibly low or handling feels off, stop and address it before driving further, especially at highway speed.
Why is my TPMS light on when my tires are fine? Three common reasons: the pressure dropped overnight in cold weather, your spare tire (if it has a sensor) is low, or a sensor battery has died. If a gauge says all tires match the door-sticker pressure and the light stays on, have the system diagnosed.
How much does a TPMS sensor cost to replace? Typically $50–$100 per sensor installed, depending on the vehicle. They usually fail one at a time as their batteries age out.
Does the TPMS light tell me which tire is low? Some vehicles display individual tire pressures on the dash; many just show the warning light. When in doubt, check all four (and the spare) with a gauge.
Will filling my tires turn the light off? Usually, after a few minutes of driving. If not, your vehicle may need a manual reset, or there may be a sensor fault.
TPMS Light On? We’ll check it!
Empire Repair is in Waverly, NE — 15 minutes from Lincoln, and worth every one of them. If your TPMS light won't go off, swing by and we'll check your tires and sensors to get you back driving safely on the road!
Your dashboard is your car's way of talking to you. We're here to translate.
Empire Repair
(402) 786-2224
14311 US-6
Waverly, NE 68462