What the tire pressure light means and how to turn it off
The tire pressure warning light (usually a horseshoe shape with an exclamation mark) turns on when your car's tire pressure monitoring system detects that one or more tires are underinflated. Resetting it requires two steps: first, you inflate your tires to the correct pressure, then you reset the light itself. The light will not turn off by itself once you add air — you have to manually reset it, either through your car's dashboard menu or by driving at highway speed for 10 to 20 minutes.
The correct tire pressure is not the maximum number printed on the tire sidewall. That number is the tire's load rating. Instead, look for the pressure specification on a sticker inside your driver's door jamb, on the fuel door, or in your owner's manual. Most cars need 30 to 35 pounds per square inch (PSI), but this varies by vehicle.
Key Takeaways
- Check the pressure specification on your driver's door jamb sticker, not the number on the tire itself, which is the maximum safe pressure.
- Use a tire pressure gauge to measure each tire's current pressure, then add air at a gas station or with a home compressor until each reaches the target PSI.
- After inflating, reset the light through your dashboard menu (the method varies by manufacturer) or by driving at highway speed for 10 to 20 minutes.
- If the light returns within a few days, one tire may have a slow leak and needs inspection by a tire shop.
Finding your car's correct tire pressure
Open your driver's side door and look at the door jamb — the vertical edge where the door closes. You should see a white or silver sticker with tire pressure information. This sticker lists the correct PSI for your front tires and rear tires separately; some cars require different pressures front and back.
If you cannot find the sticker on the door jamb, check the inside of your fuel door (the panel that covers your gas cap), the glove compartment, or your owner's manual. The manual will have a section titled "Tire Specifications" or "Recommended Tire Pressure." Write down the numbers before you go to inflate.
Tire pressure changes with temperature — cold weather lowers pressure, warm weather raises it. If your light came on during a cold snap, your tires may straightforward need air because the pressure dropped naturally. This is normal and not a sign of a leak.
Checking and inflating your tires
Buy or borrow a tire pressure gauge. Digital gauges are more accurate than stick gauges and cost $10 to $20. Remove the valve cap from one tire (the small plastic or metal cap on the tire stem), press the gauge onto the valve stem firmly, and read the pressure. Write down the PSI for each of the four tires.
Compare each reading to the target pressure on your door jamb sticker. If any tire is below the target, you need to add air. Drive to a gas station with an air pump — most stations have them near the air and water station, and they are usually free. Some stations charge 50 cents to $1 per use.
At the pump, remove the valve cap, attach the air hose nozzle to the valve stem, and hold it firmly in place. The pump will begin adding air automatically. Check the pressure every few seconds by removing the hose and using your gauge. Stop when you reach the target PSI. Repeat for each tire that was low. Replace all valve caps when finished.
If you do not have access to a gas station pump, a portable 12-volt air compressor ($30 to $60) plugs into your car's cigarette lighter and inflates tires at home. A battery-powered compressor ($40 to $100) works without needing to plug in.
Resetting the light through your dashboard menu
Many cars let you reset the tire pressure light through the dashboard menu without visiting a mechanic. The exact steps depend on your car's make and model, but the general process is the same: find the tire pressure or vehicle settings menu, then select "Reset" or "Relearn."
Start your car but do not start the engine — turn the key to the "On" position (or press the start button without pressing the brake). Use the steering wheel buttons or dashboard touchscreen to navigate to Settings, Vehicle, or Tire Pressure. Look for an option that says "Reset," "Relearn," "TPMS Reset," or "Tire Pressure Reset." Select it and confirm. The light should turn off within a few seconds.
If your car does not have a dashboard menu option, or if you cannot find the reset function, try the automatic reset method instead. Some cars reset the light automatically after you drive at highway speed (above 50 mph) for 10 to 20 minutes. The tire pressure monitoring system recalibrates as the tires warm up and reach their normal operating pressure.
If you are unsure how to access your car's menu, check your owner's manual or search online for "[your car year, make, model] reset tire pressure light." YouTube videos often show the exact button sequence for your specific vehicle.
What to do if the light comes back on
If the tire pressure light returns within a few days of resetting it, one of your tires likely has a slow leak. A slow leak can be caused by a puncture, a damaged valve stem, or a crack in the tire sidewall. You will need to have the tire inspected by a tire shop or mechanic.
Do not ignore a returning light. A slow leak will eventually cause the tire to lose enough pressure to affect your car's handling and fuel economy. More importantly, a severely underinflated tire can overheat and fail while you are driving.
Take your car to a tire shop and tell them which tire the light is indicating (if your car's system shows which one). They can inspect the tire, patch a puncture if possible, or replace the tire if it cannot be repaired. A patch typically costs $10 to $25; a new tire costs $75 to $200 depending on the tire quality and your vehicle.
When to check tire pressure regularly
Check your tire pressure once a month, even if the warning light is off. Monthly checks catch slow leaks before they become problems and keep your tires at the correct pressure for fuel economy and safety.
Check pressure more often during winter or if you live in a climate with large temperature swings. A 10-degree drop in outside temperature can lower tire pressure by 1 to 2 PSI. If you live somewhere that gets very cold, you may see your tire pressure light come on every winter without any leak present — this is normal.
Check pressure before long road trips, after hitting a pothole or curb, or if you notice your car handling differently than usual. Keeping tires at the correct pressure extends tire life, improves fuel economy, and makes your car safer to drive.
Frequently Asked Questions
Why does the tire pressure light stay on after I add air?
The light does not turn off automatically when you inflate the tire. You must reset it manually through your dashboard menu or by driving at highway speed for 10 to 20 minutes. If you have already done this and the light is still on, one of your tires may still be below the target pressure — use a gauge to double-check all four tires.
Can I drive with the tire pressure light on?
You can drive short distances, but you should not ignore it. Underinflated tires reduce fuel economy, wear out faster, and can overheat on long drives or in hot weather. If the light is on, check and inflate your tires as soon as you can.
What if I cannot find the tire pressure sticker on my car?
Check the inside of your fuel door, your glove compartment, and your owner's manual. If you still cannot find it, search online for "[your car year, make, model] tire pressure" or call your car's dealership with your vehicle identification number (VIN). They can tell you the correct pressure over the phone.
Does the tire pressure light mean I have a flat tire?
Not necessarily. The light comes on when pressure drops below a certain threshold, usually 25% below the target PSI. A tire can be significantly underinflated and still hold air. A true flat tire (zero pressure) is rare; most tire problems are slow leaks that the warning system catches before the tire fails.
Should I inflate my tires to the maximum PSI listed on the tire?
No. The number on the tire sidewall is the maximum safe pressure the tire can hold, not the pressure your car needs. Always use the pressure listed on your door jamb sticker. Overinflating to the maximum makes your tires wear unevenly and gives you a rougher ride.