Tire Pressure Monitoring System (TPMS) sensors measure the air pressure inside your tires and alert you when they’re low. When these sensors malfunction, they can put your safety at risk.
If you suspect your TPMS sensor isn’t working properly, you’ll need to diagnose the problem. Knowing how to tell if a TPMS sensor is bad can help you fix the issue quickly and safely.
In this guide, you’ll learn about the signs of a bad TPMS sensor, the possible causes, and how to tell if a TPMS sensor is bad. We’ll also include a section of frequently asked questions about TPMS sensors.
Signs of a Bad TPMS Sensor
The most common signs of a bad TPMS sensor include the following:
- A warning light on your dashboard indicating a tire pressure issue
- Tires that appear to be low on air pressure
- Tires that look unevenly inflated with one side lower than the other
- TPMS sensors that aren’t communicating with your vehicle’s computer
It’s important to note that a warning light on the dashboard isn’t always a sign of a bad TPMS sensor. The issue could be caused by a low tire pressure, a faulty valve stem, or a dead battery in the TPMS sensor.
Possible Causes of a Bad TPMS Sensor
TPMS sensors can fail due to a variety of reasons, including:
- A dead battery in the sensor
- Damage to the sensor caused by debris, road hazards, or other objects
- A faulty valve stem
- Corrosion of the sensor
How to Tell if a TPMS Sensor is Bad
If you suspect the TPMS sensor in your vehicle is bad, you’ll need to diagnose the issue. You can do this by:
- Checking the tire pressure with a tire pressure gauge to make sure the tires are properly inflated.
- Visually inspecting the TPMS sensors for damage or corrosion.
- Using a TPMS scan tool to check the communication between the sensors and the vehicle’s computer.
- Testing the battery in the TPMS sensor with a multimeter.
If you find that the TPMS sensor is bad, you’ll need to replace it. This is a job best left to a qualified mechanic or technician.
Frequently Asked Questions about TPMS Sensors
How often should I replace my TPMS sensors?
The general rule of thumb is to replace your TPMS sensors every 5-7 years. However, you should consult your vehicle’s manual for specific recommendations.
Are TPMS sensors mandatory?
Yes, TPMS sensors are mandatory in the United States. All vehicles model year 2008 or newer are required to have TPMS sensors.
Can I reset my TPMS sensor?
Yes, you can reset your TPMS sensor. This is usually done with a TPMS scan tool or by pressing a reset button on the vehicle’s dashboard.
What is the difference between direct and indirect TPMS?
Direct TPMS sensors measure the air pressure inside the tire directly, while indirect TPMS sensors measure the rotational speed of the wheels to estimate the tire pressure.
Conclusion: How to Tell if a TPMS Sensor is Bad
Knowing how to tell if a TPMS sensor is bad can help you diagnose and fix the issue quickly and safely. Common signs of a bad TPMS sensor include a warning light on the dashboard, tires that appear to be low on air pressure, and sensors that aren’t communicating with your vehicle’s computer.
If you suspect your TPMS sensor is bad, you can check the tire pressure with a tire pressure gauge, visually inspect the TPMS sensors for damage or corrosion, and use a TPMS scan tool to check the communication between the sensors and the vehicle’s computer.
If you find that the TPMS sensor is bad, you’ll need to replace it. This is a job best left to a qualified mechanic or technician.
