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Why is my TPMS light on when my tire pressure is fine?

If your tire pressure monitoring system (TPMS) light is illuminated on your dashboard, even though your tire pressure appears to be normal, there could be a few potential reasons. The TPMS light is designed to alert you when there is an issue with your vehicle's tire pressure, but it can sometimes turn on for other reasons unrelated to actual tire pressure.

Potential Reasons for TPMS Light Being On

Tire Pressure Fluctuations: The TPMS system is sensitive and may detect small changes in tire pressure that don't necessarily require immediate attention. Slight pressure fluctuations due to temperature changes or other factors can sometimes trigger the TPMS light.

Sensor Malfunction: The TPMS sensors located in each tire can sometimes malfunction or fail, causing the warning light to illuminate even if the tire pressure is normal.

Low Battery in TPMS Sensor: TPMS sensors have small batteries that power the sensors. If the battery is low, it can cause the TPMS light to turn on.

Incorrect Tire Pressure Setting: The TPMS system is calibrated to specific tire pressure levels. If the recommended tire pressure is changed but the TPMS system is not recalibrated, the light may stay on.

Damaged TPMS Sensor: If a TPMS sensor is physically damaged, such as from hitting a pothole or curb, it can trigger the warning light.

If the TPMS light is on and your tire pressure appears normal, it's a good idea to have your vehicle inspected by a professional to diagnose the underlying issue. They can use a TPMS diagnostic tool to identify the specific problem and make the necessary repairs or adjustments.

What if my TPMS light is on but the tire is okay?

A recalibration or reset of the TPMS system is often required in these situations. This can be done by following the instructions in your vehicle's owner's manual, or you may need to take the vehicle to a professional to reset the system using specialized tools.

Is it okay to drive with the TPMS light on?

It is not safe to drive with a TPMS light on, as it indicates a tire is significantly underinflated (at least 25% below the recommended pressure). While you may be able to drive short distances, it's best to pull over as soon as possible to check your tire pressure with a gauge and inflate it to the recommended level. Ignoring the light can lead to uneven tire wear, poor handling, reduced fuel efficiency, and a dangerous tire blowout.
This video explains why it's bad to drive with low tire pressure: 55sABC11YouTube · Dec 13, 2017
What to do when the TPMS light comes on

Don't ignore it: The TPMS light is a warning about a potentially unsafe condition and should not be ignored.
Pull over safely: As soon as it is safe to do so, pull over to the side of the road.
Check your tire pressure: Use a tire pressure gauge to check the air pressure in all four tires. Check the recommended pressure on the sticker located on the driver's side door jamb or in your owner's manual.
Inflate if necessary: If a tire is low, inflate it to the recommended pressure. If it was just a minor temperature drop, this may resolve the issue.
If the light stays on: If the light remains on after you have filled the tires or if all tires are at the correct pressure, there may be a fault in the TPMS system itself.
See a mechanic: If the light continues to stay on, or if a tire consistently loses pressure, take your vehicle to a professional to have the system and tires inspected.

Can AutoZone reset TPMS sensor?

At AutoZone, we carry replacement TPMS sensors for most makes and models. And if you need help resetting the TPMS light, we can offer helpful advice or refer you to a shop in our professional network.

Why is my TPMS light on but all my tires are fine?

If your tire pressure light is on but your tires are fine, it's likely due to a malfunctioning TPMS sensor, a need to recalibrate the system after a tire rotation, or an overinflated tire. You should first confirm the tire pressure with a reliable gauge and recalibrate the system if the pressure is correct, as described in your owner's manual. If the problem persists, have a professional inspect the TPMS sensors, as they can fail due to age, damage, or a dead battery.

Potential causes and solutions
This video explains four common reasons why the tire pressure light may be on even when the tires seem fine: 46sMaxTheCarGuyYouTube · Mar 6, 2023
1. Incorrect tire pressure

Problem: Even if tires look fine, they may be overinflated or slightly underinflated.
Solution: Use a high-quality tire pressure gauge to check the pressure in all four tires, including the spare if it has a sensor. Inflate them to the recommended PSI found on the sticker in your driver's side door jamb.

2. TPMS system malfunction

Problem: The system may be giving a false reading due to a faulty sensor, a dead sensor battery, or a general electronic issue.
Solution: After checking the pressure, try to reset the system. This often involves a specific sequence of turning the ignition on and off or pressing a button on the dashboard. If that doesn't work, a professional needs to diagnose and replace the faulty sensor.

3. Recent tire service

Problem: A recent tire rotation or replacement can trigger the light because the sensors may have been inadvertently damaged or need to relearn the new wheel positions.
Solution: After confirming the correct pressure, drive your car for about 10-20 minutes at a consistent speed. This may allow the system to automatically recalibrate itself. If not, a mechanic may need to perform an external recalibration.

4. Overinflated tires

Problem: The light can also come on if the tires are significantly overinflated, not just underinflated.
Solution: Check the pressure and let some air out until the tires reach the recommended PSI.

This video shows how to reset the tire pressure light on vehicles with a display audio system: 1mHondaYouTube · May 15, 2019
Important safety note

Do not ignore the light: Even if your tires look fine, low pressure can still cause hidden damage over time, and a malfunctioning sensor still means you won't get an accurate reading if a real problem occurs. It's crucial to get the system checked to ensure your tires are safe and properly inflated.

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.