Why Your Tire Pressure Light is On Even When Your Tires are Fine!

Many drivers have experienced the frustration of seeing their tire pressure light turn on, even when their tires appear to be fine. This warning light is part of the tire pressure monitoring system (TPMS) that comes standard in most modern vehicles. Its purpose is to alert drivers when one or more tires have low pressure, which can lead to poor handling, reduced fuel efficiency, and even tire failure.

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However, if drivers check their tire pressure and find it is within the recommended range, they may wonder why the TPMS light is still on. There are several reasons why this can happen, ranging from faulty sensors to changes in temperature. Understanding these causes can help drivers determine whether they need to take their vehicle to a mechanic or reset the TPMS system themselves.

Understanding TPMS

What is TPMS?

TPMS stands for Tire Pressure Monitoring System. It is an electronic system that monitors vehicle tires’ air pressure. The TPMS system can detect when a tire’s pressure drops below a certain level and alerts the driver by illuminating the TPMS light on the dashboard.

How Does TPMS Work?

There are two types of TPMS systems: direct and indirect. Direct TPMS systems use sensors in each tire to monitor the air pressure. The sensors transmit the pressure readings to the TPMS control module, which then sends the information to the vehicle’s computer. If the pressure drops below the specified level, the TPMS light will illuminate on the dashboard.

Indirect TPMS systems use the vehicle’s speed sensors to monitor the rotational speed of the tires. If a tire’s pressure drops, the tire’s diameter decreases, causing it to rotate faster than the other tires. The TPMS system detects this difference in rotational speed and alerts the driver by illuminating the TPMS light.

Understanding TPMS is essential to maintain the safety of a vehicle. It is important to know how TPMS works and the different types of TPMS systems. By doing so, drivers can take the necessary steps to ensure their vehicle’s tires are properly inflated and avoid potential accidents caused by low tire pressure.

Why is my Tire Pressure Light On?

Common Causes

If the TPMS warning light comes on in a vehicle, it is an indication that one or more of the tires are underinflated. The most common cause of the tire pressure light is low tire pressure. The light could also come on due to a faulty sensor or sensor malfunction.

Another reason for the light to come on is debris or wear and tear on the tire pressure sensor. Corrosion can also cause the sensor to malfunction, leading to the TPMS warning light to come on.

How to Fix the Issue

To fix the issue, the driver should first check the tire pressure with a tire pressure gauge. If the tire pressure is low, the driver should inflate the tire to the correct tire pressure. The recommended tire pressure can be found in the vehicle’s owner manual or on a sticker located on the driver’s side door jamb.

If the tire pressure is correct, the driver should check the tire pressure sensor for any debris or corrosion. If debris or corrosion is present, the driver should clean the sensor. If the sensor is faulty, the driver should replace the sensor.

To reset the tire pressure light, the driver should locate the TPMS reset button, which is usually located under the steering wheel. The driver should press and hold down the reset button until the low-pressure light blinks three times.

The driver should then release the button, start the vehicle, and let it run for 20 minutes to let its computer recalibrate each sensor. Finally, the driver should turn off the ignition.

The TPMS warning light coming on is an indication that the tire pressure is low or that there is an issue with the tire pressure sensor. The driver should check the tire pressure and sensor for any issues and fix them accordingly.

Maintaining TPMS

Properly maintaining TPMS can help prevent the tire pressure light from coming on unnecessarily. Here are some tips on how to maintain TPMS:

How to Check Tire Pressure

Regularly checking tire pressure is essential to prevent the tire pressure light from coming on. The recommended tire pressure can be found in the owner’s manual or on a sticker in the driver’s side door jamb. To check tire pressure, use a tire pressure gauge and check the pressure when the tires are cold. Add air to any tires that are low.

When to Rotate Tires

Rotating tires can help them last longer and prevent uneven wear. The recommended tire rotation schedule can also be found in the owner’s manual. Typically, tires should be rotated every 5,000 to 7,000 miles.

Replacing Tires and TPMS Sensors

When it’s time to replace tires, it’s important to replace them with a new set of tires that are the same size and type as the original tires. This will help prevent the tire pressure light from coming on unnecessarily. When replacing tires, it’s also a good idea to replace the TPMS sensors. TPMS sensors have a battery life of about 5 to 10 years, and replacing them can prevent the tire pressure light from coming on due to a faulty sensor.

Core

If a tire has a slow leak or is overinflated, it can cause the tire pressure light to come on. In this case, the tire should be inspected for damage or punctures. If there are no visible signs of damage, the tire may need to be removed from the rim and the core may need to be replaced.

Increased Wear

If tires are overinflated or underinflated, they can wear unevenly. This can cause the tire pressure light to come on. To prevent this, make sure to regularly check tire pressure and keep it at the recommended level.

Overheat

Overheating can also cause the tire pressure light to come on. This can happen if tires are underinflated or overloaded. To prevent this, make sure to regularly check tire pressure and never overload the vehicle.

By following these tips, drivers can help maintain TPMS and prevent the tire pressure light from coming on unnecessarily.

Troubleshooting TPMS

When the TPMS warning light comes on, it’s essential to diagnose the problem as soon as possible. Here are some steps to follow to troubleshoot TPMS:

TPMS Warning Light

If the TPMS warning light comes on, it means that one or more tires are underinflated. Check the tire pressure using a tire gauge and inflate the tires to the recommended pressure listed in the owner’s manual or on the tire placard.

If the tire pressure is correct, but the warning light is still on, the TPMS sensor may be faulty or unprogrammed. In this case, resetting the TPMS system with a scanner or following the procedure for your specific car model may help.

Other Warning Lights and Indicators

If you see other warning lights or indicators along with the TPMS warning light, it could be a sign of a more serious problem. For example, if the battery warning light is on, it could indicate a dead battery.

If the ABS warning light is on, it could indicate a problem with the anti-lock braking system. If the traction control warning light is on, it could indicate a problem with the traction control system.

Other Factors to Consider

Outside temperature can also affect tire pressure. In cold weather, tire pressure can decrease, triggering the TPMS warning light. It’s essential to check the tire pressure regularly during colder months. Tire failure can also cause the TPMS warning light to come on. If you notice any signs of tire damage, such as cuts, punctures, or bulges, have the tire inspected immediately.

If the TPMS warning light stays on even after checking the tire pressure and resetting the system, there may be a risk of a blowout or other serious tire-related issues. It’s important to have the vehicle inspected by a qualified mechanic as soon as possible to avoid any potential hazards.

Different car models have different TPMS reset procedures. For example, Honda and Ford have different TPMS reset procedures. Make sure to follow the correct procedure for your car model to avoid any issues.

Conclusion

In summary, the tire pressure light can come on even when the tires are fine due to various reasons. It is important to check the tire pressure regularly and keep it at the recommended level to avoid any issues.

If the tire pressure light comes on, it could be due to a faulty or unprogrammed tire pressure sensor. In such cases, resetting the TPMS system with a scanner or following the specific car model’s procedure may help.

Low tire pressure is the most common cause of the tire pressure light coming on. It is crucial to fill the tires with air to the recommended pounds per square inch (psi) level. The infotainment system in some vehicles may also tell you which tire is low on air, making it easier to repair.

Overinflated tires can also cause the tire pressure light to come on. It is important to check the tire pressure regularly and not overinflate the tires.

If a puncture or damage has occurred, it is important to change the tire or repair it immediately. Driving on a flat tire or a tire with low pressure can cause damage to the tire and the vehicle’s suspension system.

It is also important to note that spare tires may not have a tire pressure sensor, and the tire pressure light may not come on even if the spare tire is underinflated. Therefore, it is crucial to check the spare tire’s pressure regularly and keep it at the recommended level.

In conclusion, if the tire pressure light comes on, it is important to take the necessary steps to address the issue promptly. Regular tire pressure checks and maintenance can help prevent such issues from occurring.

Frequently Asked Questions

How do I reset the low tire pressure light?

To reset the low tire pressure light, you need to inflate your tires to the recommended pressure levels and then reset the TPMS system. The process for resetting the TPMS system varies depending on the make and model of your vehicle. However, most vehicles have a reset button that you can press to reset the system.

Where is the TPMS reset button?

The location of the TPMS reset button varies depending on the make and model of your vehicle. In some vehicles, the reset button is located under the steering wheel, while in others, it is located in the glove compartment. You can refer to your vehicle’s owner’s manual to locate the TPMS reset button.

Do I need to reset TPMS after new tires?

Yes, you need to reset the TPMS system after installing new tires. This is because the new tires may have different pressure levels than the old ones, and the TPMS system needs to be calibrated to the new pressure levels.

Why does my tire pressure light keep coming on when it’s cold?

When the temperature drops, the air in your tires contracts, causing the tire pressure to drop. This can trigger the TPMS system and cause the tire pressure light to come on. To avoid this, you should check your tire pressure regularly and inflate your tires to the recommended pressure levels.

How do I check my tire pressure sensor?

To check your tire pressure sensor, you can use a TPMS tool or take your vehicle to a mechanic. The TPMS tool can read the pressure levels of each tire and diagnose any issues with the TPMS system.

What could be causing the tire pressure light to stay on?

The tire pressure light may stay on due to several reasons, including low tire pressure, a faulty TPMS sensor, a damaged tire, or a malfunctioning TPMS system. You should check your tire pressure levels and inspect your tires for any damage. If the issue persists, you may need to take your vehicle to a mechanic for further diagnosis.