Tire pressure sensors, also known as TPMS, are crucial components of modern vehicles. They are responsible for detecting changes in tire pressure and alerting the driver of any issues. In this guide, we will explore the functions of TPMS, how they work, the common causes of failure, symptoms to look out for, and how to fix a bad one.

What is a Tire Pressure Monitoring Sensor (TPMS)?

TPMS is a relatively new addition to modern vehicles. Before TPMS, the only way to check tire pressure was to do it manually with a tire gauge. The National Highway Traffic Safety Administration (NHTSA) mandated that all vehicles sold in the United States after September 2007 should come equipped with a tire pressure sensor. This was done to improve vehicle safety and fuel efficiency, as well as to reduce the number of accidents caused by underinflated tires.

TPMS technology can be broadly categorized into two types: direct and indirect. Direct TPMS measures the air pressure in the tire using a sensor that is mounted inside the tire. Indirect TPMS, on the other hand, uses the wheel speed sensors that are already present in most vehicles to infer the tire pressure.

In general, a direct tire pressure sensor is considered more accurate than an indirect TPMS, but it can be more expensive to install and maintain. It is important to note that TPMS does not replace regular tire maintenance and inspection. Even with TPMS, it is still recommended to visually inspect your tires for damage or wear and to check your tire pressure manually at regular intervals.

If you’re looking for a new tire pressure sensor, we offer a wide range of quality replacement options in our catalog!

Common Causes of TPMS Failure:

TPMS sensors are sophisticated electronic components that can fail due to various reasons. Some of the most common causes of TPMS failure include:

Low Battery Voltage

The TPMS sensor operates on a battery, which can lose its charge if the sensor is not used for an extended period. If the battery voltage drops below the required level, the TPMS sensor will not function correctly. This can lead to inaccurate readings or the TPMS warning light coming on.

Damage from Road Debris

TPMS sensors are located on the valve stem of each tire, making them vulnerable to damage from road debris. Rocks, potholes, and other debris can knock the sensor off the valve stem or cause physical damage to the sensor. This can cause the TPMS to malfunction or fail altogether.

Exposure to Extreme Temperatures

Extreme temperatures can cause the TPMS sensor to fail. High temperatures can damage the electronic components of the sensor, while low temperatures can cause the battery to lose its charge. This can lead to inaccurate readings or the TPMS warning light coming on.

Corrosion

Corrosion is a significant problem for tire pressure sensors, especially those located in areas where there is exposure to salt or other corrosive materials. It can damage the sensor’s electronic components, leading to inaccurate readings or the TPMS warning light coming on.

Sensor Age

TPMS sensors have a lifespan of around 5–7 years. As they age, the sensor’s accuracy can deteriorate, leading to false readings or the TPMS warning light coming on.

Faulty Wiring

Faulty wiring can cause the TPMS sensor to fail. If the wiring is damaged or disconnected, the sensor will not be able to transmit accurate information to the vehicle’s computer, leading to incorrect readings or the TPMS warning light coming on.

It is essential to keep your TPMS sensors in good working condition to ensure your vehicle’s safety. By understanding the common causes of TPMS failure and addressing any issues promptly, you can prevent costly repairs and avoid potential accidents on the road.

Common Symptoms of TPMS Failure

When your TPMS fails, it can cause a range of symptoms that can affect your driving experience, fuel efficiency, and vehicle safety. Here are some common symptoms of TPMS failure:

Dashboard Warning Light

One of the most common symptoms of a tire pressure sensor failure is the illumination of the TPMS warning light on the dashboard. This warning light usually looks like a flat tire with an exclamation mark in the middle. If you see this warning light, it is important to have your TPMS checked by a qualified technician as soon as possible.

Inaccurate Tire Pressure Readings

Another symptom of a TPMS failure is inaccurate tire pressure readings. Your TPMS may display the wrong pressure reading for one or more of your tires, which can make it difficult to maintain proper tire pressure. This can result in poor fuel economy, reduced tire life, and even tire failure.

Inability to Reset the TPMS Warning Light

If you try to reset the TPMS warning light after checking and adjusting your tire pressures, but the light remains on, it could be an indication of a TPMS failure. In this case, it is important to have your TPMS checked by a qualified technician to determine the cause of the problem.

Unresponsive TPMS System

If your TPMS system is unresponsive and does not display any readings or warnings, it could be a sign of a TPMS failure. This can be caused by a number of factors, including a dead battery, faulty sensors, or a malfunctioning TPMS module.

How to Fix a Bad TPMS Sensor 

When it comes to fixing a bad TPMS, there are some steps that you can take before resorting to a replacement. However, it’s important to note that replacing the sensor is often the best solution, especially if the TPMS has been damaged or malfunctioning for an extended period.

One of the first things you can do is check the battery voltage of the sensor. If the battery is low, replacing it may solve the problem. You can also try reprogramming the sensor or resetting the system, which can sometimes resolve issues with inaccurate readings or warning lights.

However, if the sensor is physically damaged or has been corroded, it will likely need to be replaced. Whatever the case may be, it’s important to diagnose the issue and perform any necessary repairs or replacements to ensure that your TPMS is functioning properly.

Get Quality TPMS Sensors at Newparts.com 

Tire pressure sensors fail for a wide range of reasons. The nature of this component is such that it is constantly exposed to all kinds of forces and external factors. If you have a bad TPS somewhere on your car, make sure to replace it with a quality component. 

Here at Newparts.com, we carry a wide range of tire pressure sensors and other TPMS components. To find a part that is a guaranteed fit for your car, head over to our store, select your vehicle, and search for a tire pressure sensor.