The TPMS light doesn't always mean a tire is flat

Your Honda's tire pressure monitoring system (TPMS) light turns on when at least one tire is underinflated or when the system itself has a problem — but a tire that looks fine to you may still be low enough to trigger the warning. The light uses electronic sensors in each wheel, not your eyes, so a tire can be 5 to 10 pounds per square inch (PSI) below the correct pressure and still look normal.

The most common reason the light stays on even after you check the tires is that one tire is genuinely low, but only slightly. Cold weather, a slow leak, or a tire that lost pressure weeks ago can all cause this. The second most common reason is that the TPMS sensor itself is faulty or the battery inside it has died — sensors typically last 5 to 10 years before the battery runs out.

Key Takeaways

  • Check all four tires with a reliable pressure gauge at a gas station or tire shop, because a tire can look fine but still be 5 to 10 PSI low.
  • Your Honda's correct tire pressure is printed on a sticker inside the driver's door jamb, not on the tire sidewall itself.
  • If all four tires are at the correct pressure and the light is still on, the TPMS sensor in one wheel is likely faulty or its battery has died.
  • A faulty TPMS sensor costs $150 to $400 to replace at a Honda dealer, depending on the model year and whether you replace one or all four.
  • The light will not affect your ability to drive, but it does mean you are not being alerted if a tire actually does go flat.

How to check your tire pressure correctly

The pressure number you need is on a white sticker inside your driver's door jamb, not on the tire sidewall. The sidewall shows the maximum pressure the tire can hold, which is much higher than what your Honda actually needs. Write down the number from the door jamb sticker — it is usually between 28 and 36 PSI depending on your model.

Use a digital or dial pressure gauge at a gas station, tire shop, or auto parts store. Remove the valve cap from each tire and press the gauge onto the valve stem firmly until you hear a small hiss and get a reading. Check all four tires, including the spare if your Honda has a TPMS sensor in it. If any tire is more than 2 PSI below the target, add air at the gas station pump. If any tire is more than 2 PSI above the target, let a small amount of air out by pressing the valve stem with a small tool.

What to do if all tires are at the correct pressure

If you have confirmed that all four tires are within 2 PSI of the correct pressure and the light is still on, the problem is almost certainly the TPMS sensor itself. The sensor is a small electronic device mounted inside the wheel, and its battery typically lasts 5 to 10 years. Once the battery dies, the sensor stops sending a signal to your car's computer, and the light stays on permanently.

You can also have a tire shop scan your Honda's computer to see which wheel's sensor is not communicating. This scan usually costs $20 to $50 and tells you exactly which sensor has failed. If the scan shows that all sensors are working, the problem may be the TPMS control module in the car itself, which is much rarer and more expensive to fix.

Replacing a faulty TPMS sensor

A Honda dealer will replace a single faulty TPMS sensor for $150 to $250 in labor and parts, though the exact cost depends on your model year. Some shops charge less — independent tire shops may quote $100 to $180 for the same job. The sensor itself costs $30 to $80, and the labor is usually 30 minutes to an hour per wheel.

You do not have to replace all four sensors at once unless more than one is faulty. However, if three or four sensors are failing at the same time, they are likely all the same age and will fail soon after, so some shops recommend replacing all four together to avoid the light coming back on in a few months. Ask the shop whether they recommend this for your specific car.

Cold weather and TPMS lights

If the light came on during a sudden cold snap, the pressure in your tires dropped because air contracts in cold temperatures. For every 10 degrees Fahrenheit the temperature drops, tire pressure falls by about 1 PSI. A tire that was at 32 PSI on a 70-degree day will be at roughly 30 PSI on a 40-degree day, which is enough to trigger the warning light.

Check your tire pressure again once the weather warms up or after you have driven for 15 minutes — friction heats the tires and raises the pressure slightly. If the light goes off on its own after the temperature rises, the sensor is working normally and you do not need to replace it. If the light stays on even after the car has warmed up, proceed with checking the pressure and the sensor as described above.

Slow leaks and the TPMS light

A tire with a slow leak may look completely normal but lose 1 to 2 PSI per week. Over several weeks, it can drop enough to trigger the light. Check the tire pressure again a few days after you first inflated it — if it has dropped more than 2 PSI, there is likely a small hole or a leaky valve stem.

A tire shop can locate the leak by submerging the tire in water or using a soapy spray to find where air is escaping. Small punctures in the tread can usually be patched for $15 to $30. If the leak is in the sidewall or the tire is old, the tire will need to be replaced instead. Fixing the leak will stop the TPMS light from coming back on once you refill the tire to the correct pressure.

What happens if you ignore the TPMS light

The light itself is not a safety hazard — it is just a warning. You can drive normally with the light on. However, the light means your TPMS system is not working, so you will not be alerted if a tire actually does go flat while you are driving. A flat tire can damage the wheel rim and make the car harder to control, especially at highway speeds.

For this reason, it is worth fixing the problem rather than ignoring it. If the issue is a low tire, the fix is free — just add air. If the issue is a faulty sensor, the cost is $150 to $250, which is much less than the cost of a damaged wheel or an accident caused by a flat tire you did not notice.

Frequently Asked Questions

Can I drive with the TPMS light on?

Yes, the light does not prevent the car from running. However, it means your tire pressure monitoring system is not working, so you will not get a warning if a tire actually goes flat. It is better to fix the problem so the system can protect you.

Will the TPMS light go off on its own?

Only if the problem was a low tire caused by cold weather or a slow leak that you have now fixed. If the light came on because a sensor battery died, it will not go off until you replace the sensor.

Do I have to go to a Honda dealer to replace the sensor?

No. Any tire shop or independent mechanic can replace a TPMS sensor. Dealers often charge more than independent shops for the same work. Get a quote from at least two shops before deciding.

What if the light comes back on after I replace the sensor?

Ask the shop to scan your car's computer again to see if another sensor has failed or if the TPMS control module has a problem. If multiple sensors are failing, they may all be the same age and due for replacement.

Is it expensive to replace all four TPMS sensors at once?

Replacing all four sensors costs roughly $400 to $800 in labor and parts at an independent shop, or $600 to $1,000 at a dealer. Only do this if the scan shows that more than one sensor is faulty.