TPMS light generally indicates whether the pressure inside a tire is within the required limits or not. But some malfunctions and faults can cause this light to be turned ON.
Different weather conditions and sensor problems can cause TPMS Light On But Tires Are Fine problems. In this scenario, you should check the pressure first. If it’s okay then the problem may lie elsewhere. But what can be the reasons? And more importantly, how to fix this issue?
Here, I’m going to explain everything you need to know about this issue. So, keep reading to know each detail.
What is TPMS Tire Pressure Monitoring System (TPMS)? HOW does TPMS work?
TPMS stands for Tire Pressure Monitoring System. This is a modern technology that is used to get information about tire inflation conditions.
Most recent cars come with TPMS installed in it. Generally, this is an electronic box fitted on the rim of tires. It collects data about the amount of air pressure inside the tires and sends it to the computer dashboard.
If there are any pressure issues, for example, if your tire is under-inflated or over-inflated, then it will give an indication of the issue. Then you can take the necessary steps to overcome the problem. So, basically, TPMS is an integrated system that is used to see whether the pressure inside the tire is within the required range or not.
TPMS Light On But Tires Are Fine – what does it indicate?
TPMS sensor provides the to the computer and it is indicated by a signal on the car dashboard. Generally, it is represented by an exclamatory sign inside a tire. However, in some cars, it can only be represented by the word TPMS.
Though the light should get turned ON when there is any pressure issue inside the tire, sometimes it can only get illuminated out of nowhere. You may have checked the tire pressure by seeing the TPMS light but there’s nothing wrong. So, what’s actually causing the TPMS light to come ON?
Well, there are several reasons for this issue. Sometimes, it can only be caused by some electrical circuit-related problem. Moreover, extreme weather, faulty sensors, etc. can be the reason too. Later in this article, you’ll see details on this problem. For now, just remember, The TPMS light is always an indication that your tire has an air pressure problem.
4 most common Reasons why is my tire pressure light on
I’ve already mentioned some of the reasons behind the TPMS light turning on. The main purpose of this system is to get illuminated the following two situations.
If the tire is under-inflated which means the pressure is lower than required or recommended, the TPMS or pressure light can come ON. In that case, you should check the pressure with a gauge and take the necessary steps to inflate it properly.
Same as under-inflation, over-inflated tires can cause the pressure light to turn ON too. So, here you also need to check the pressure and remove it if required.
But what if these aren’t the cases, still the light is ON. What’s behind this? Well, there may be some other reasons behind this. I’ve divided the reasons into two main categories.
Let’s see them one by one.
>> Environmental issue:
There are several environmental factors that can cause the TPMS light to turn ON. These are:
- Extremely cold weather:
In cold weather, like all other substances, air also gets compressed. As a result, the air volume inside the tire decreases. Which results in the under-inflation of tires. So, the sensor gets data on this and sends it to the control panel which causes the light to turn ON.
- Extremely hot weather:
Just like cold weather, high temperatures can cause the opposite result. Study shows, for temperature fluctuations of every 40 to 50 Degree Fahrenheit, the pressure can vary by 4 to 5 PSI. Which may cause over-inflation and turn the light ON.
- Snowy roads:
While driving on snowy roads the tire remains in contact with the snow continuously. This can cause similar problems like cold weather. It can be a reason for TPMS light illumination.
>> Technical issues:
Not only the environment can affect the TPMS light. The following technical issues can also be the reason for the TPMS light being ON.
- Fault in circuits or sensors:
Any issues like a short circuit, malfunctioning sensor, or damage to the circuit board or control panel may cause problems with the TPMS light.
- Tire replacement:
Since the TPMS module is generally located on the rim of the wheel while replacing or repairing tires it can affect the sensor module. In that case, the light can come up.
- External impact:
If any accidents like punctures occur or the pressure valve of the tires gets damaged, it’ll result in blowing out of the air. Then the pressure will drop and the light will come up.
How to solve the low tire pressure light but tires are fine issues?
First thing first, if the TPMS light is ON, check the tire pressure immediately. In most cases, the main reason is abnormal tire pressure. If it’s okay and the problem is not in tire pressure, follow the following steps one by one.
- You can disconnect the power line coming from the battery and then reconnect it in the first place to see whether it works or not.
- If the problem lies in the sensor module, there’s no other convenient option than replacing it. It may cost 59-100$ to fix or change the TPMS module.
- Sometimes, the pressure valve can get damaged and may need to be repaired. This will keep the air amount constant inside the tire.
- Often the calibration of the sensor gets interrupted. To calibrate the sensor you may need to reset the TPMS. The instructions are mentioned below.
- If resetting doesn’t work, go to a repair shop immediately to overcome the issue.
How to reset the TPMS?
To reset the sensor, follow these instructions step by step.
- Find the TPMS reset button by following the owner’s manual.
- Then, turn on the key but not the engine.
- Press the reset button for three seconds until you hear a beep and the warning light turns ON.
- Then start the engine and drive for about an hour at a minimum speed of 19 mph.
By doing these, the TPMS will reset.
Why is maintaining tire pressure important?
Maintaining tire pressure is something you must pay attention to. According to some studies, about 11,000 accidents occur each year due to incorrect air pressure of tires. This can often lead to the following problems.
- The tires will wear out quickly with inaccurate tire pressure.
- More heat will be generated if the tires are under-inflated.
- Overinflation may lead to less control while driving.
- It will be hard to keep the vehicle stable and brake if the tire pressure is not perfect.
frequently asked questions (FAQs)
Is it okay to drive with the TPMS light ON?
Definitely, it’s not okay to drive with the TPMS light ON no matter whether it is a pressure issue or something else.
Can I disable my TPMS sensor?
Yes. By using a Bypass emulator you can disable the sensor. Discuss with the nearest mechanic to know more.
Where is the TPMS reset button?
Generally, the button is located under the steering wheel. Read the owner manual to be more particular about the location.
Maintaining proper air pressure inside a tire is one of the most important principles of safe driving. To help to maintain this, TPMS is provided.
But it doesn’t mean each time the TPMS will provide accurate data each. It can get ON even if there’s no problem with air pressure. Extremely hot or cold weather can cause this issue along with some other technical problems.
So, to overcome this problem, regular checking and maintenance are necessary. If the primary steps are not working consulting with a professional mechanic is highly recommended.
Certification: BSc in Mechanical Engineering
Education: Mechanical engineer
Lives In: 539 W Commerce St, Dallas, TX 75208, USA
Rasel is an auto mechanic student and writer with over half a decade of experience in the automotive field. He has worked with top automotive brands such as Lexus, Quantum, and also owns two automotive blogs autocarneed.com and taxiwiz.com.