Why is my low tire pressure light on but my tire pressure is normal?
As a car owner, seeing the low tire pressure light illuminate on your dashboard can be concerning, especially when you've just checked your tire pressure and found it to be normal. Understanding the reasons behind this discrepancy is crucial for maintaining your vehicle's safety and performance. In this article, we will explore the common causes of a low tire pressure warning light and what steps you can take to address the issue.
Common Causes of a Low Tire Pressure Light
There are several reasons why your low tire pressure light might be on even when your tire pressure appears to be normal. Here are some of the most common causes:
- Temperature Changes: Tire pressure can fluctuate with temperature changes. A drop in temperature can cause the air inside your tires to contract, leading to a decrease in pressure that triggers the warning light.
- Faulty Tire Pressure Monitoring System (TPMS): The TPMS itself may be malfunctioning. If the sensors are damaged or the system is not calibrated correctly, it can give false readings.
- Slow Leaks: Even if your tires seem fine, there could be a slow leak that isn't immediately noticeable. This can cause the pressure to drop gradually, triggering the warning light.
- Improper Tire Installation: If tires were recently installed or rotated, they may not have been properly seated on the rims, leading to pressure loss.
- Sensor Issues: The sensors in the tires may be dirty or corroded, affecting their ability to accurately read the tire pressure.
What to Do If Your Light is On
If your low tire pressure light is on but your tire pressure is normal, here are some steps you can take:
- Check Tire Pressure Again: Use a reliable tire pressure gauge to double-check the pressure in all tires, including the spare.
- Inspect for Damage: Look for any visible signs of damage or punctures on the tires that may not be immediately obvious.
- Reset the TPMS: Sometimes, resetting the TPMS can resolve the issue. Refer to your vehicle's manual for instructions on how to do this.
- Visit a Professional: If the light remains on after checking the above, it may be time to visit a trusted auto service provider to diagnose the issue further.
Conclusion
Understanding why your low tire pressure light is on despite normal tire pressure is essential for your vehicle's safety. By being aware of the potential causes and taking appropriate action, you can ensure that your tires remain in good condition and your vehicle operates smoothly. If in doubt, don't hesitate to consult with a professional auto service provider for assistance.
Frequently Asked Questions
Why does my car say I have low tire pressure when I don t?
TPMS malfunction: If the TPMS itself is malfunctioning, the light may come on even if your tire pressure is normal. If you see the tire pressure light and your tires seem properly inflated, it's a good idea to have the TPMS checked by a mechanic.
Can AutoZone check TPMS sensors?
You can get them replaced at most tire shops like Walmart, Discount Tire, Firestone, and PepBoys. Plus, Walmart and AutoZone test your sensors for free so you can figure out if they're bad or not. Also, if you do want to get then replaced at Walmart, they're like 30ish dollars each, and they come with new valve stems.
How to reset tire pressure sensor?
Set the parking brake. Look for a button to the left of the steering column labeled with the TPMS icon if it's there push and hold it until the TPMS indicator in the instrument panel blinks twice.
How much does it cost to replace a tire pressure sensor?
In the event TPMS sensors need to be replaced, the cost can range from approximately $50-$100 each depending on vehicle type.
Is it okay to drive with the tire pressure light on?
This is why you should maintain proper inflation pressure and try to avoid driving when the TPMS light is on. If you absolutely must drive a short distance on a tire with severely low pressure, drive very slowly and use extreme caution. The tire should be inflated or changed before driving anywhere.
How do I know which tire sensor is bad?
Measure the air pressure of each tire and record them. Then, compare the data with the one displayed in your car display panel. If the reading in one tire is different from the one displayed, it might mean that there's a problem with the TPMS sensor in that tire.
Why did my tire pressure light come on but my tires are fine?
If you've added air but the air pressure warning light stays on, there's a problem with your Tire Pressure Monitoring System or you have a slow leak... Quick Tip: If the TPMS warning light comes back on after you've filled the tire with air, recheck the tire to make sure it is inflated to the proper air pressure.
Why is my TPMS light on with good pressure?
One of the most common reasons for a TPMS light staying on despite the tires being properly inflated is a sensor malfunction. TPMS sensors are typically located inside the tire and can wear out or become damaged over time, particularly if you've hit a curb, driven through a pothole, or been off-road.
What is a dangerously low tire pressure?
Pressures below 20 PSI are considered “flat” and dangerous to drive on. Usually, low pressures indicate a puncture but can also occur over long periods naturally as air escapes.
Can a tire pressure light be false?
False Light: Sometimes, the TPMS sensor itself is acting up. It might be sending false warnings or incorrect pressure readings. Low Battery: Some TPMS sensors have their own batteries that need replacing every few years. If they've fizzled out, the system can go haywire.
