Understanding the Tire Pressure Light Flashing

Seeing your [tire pressure monitoring system (TPMS)] (https://simpletire.com/learn/tire-maintenance-safety/tire-pressure-monitoring-system) light flashing can be confusing, but it’s your vehicle’s way of telling you that something needs attention. While a solid TPMS light usually means low tire pressure, a flashing light signals a possible issue with the system itself.

A properly functioning TPMS is crucial for maintaining tire safety, fuel efficiency, and overall vehicle performance. Ignoring a flashing light could mean missing out on important alerts about your tires, leading to uneven wear, poor handling, or even tire failure. If your tire pressure light is flashing, here’s what it could mean and what you should do next.

Why Is My Tire Pressure Light Flashing?

A flashing TPMS light typically means a malfunction within the system rather than just low tire pressure. This issue could stem from:

1. A sensor malfunction – A damaged or faulty TPMS sensor may no longer be able to monitor tire pressure accurately.

2. A dead sensor battery – TPMS sensors have built-in batteries that eventually run out of power.

3. Incorrect sensor installation – If the sensors were recently replaced or moved, they might not properly communicate with the system.

When the TPMS light flashes for about 60-90 seconds and then stays illuminated, it’s time to investigate the cause and take action.

What to Do When Your TPMS Light Flashes

1. Check Your Tire Pressure First

Even though a flashing TPMS light often indicates a system issue, low tire pressure could still be the root cause.

• Use a tire pressure gauge to check the air pressure in all four tires.
• Compare your readings to the recommended levels in your vehicle’s manual or the sticker inside the driver’s door.
• If needed, inflate the tires to the correct pressure.
• If the light turns off after inflating the tires, the issue may have been as simple as underinflation. But if the light continues flashing, the problem likely lies within the TPMS sensors.

2. Inspect the TPMS Sensors

If your tires are properly inflated but the TPMS light is still flashing, the sensors themselves could be failing.

• Check for physical damage – TPMS sensors are located inside the tire near the valve stem. If they’ve been damaged by road debris or corrosion, they may no longer function properly.
• Consider sensor battery life – TPMS sensors typically last 5-10 years, and a dead battery could cause a malfunction.
• Look into recent tire work – If you've recently had new tires installed or rotated, the sensors may not have been reprogrammed correctly.

3. Know the Signs of a TPMS System Malfunction

When the tire pressure light flashes for a minute before staying on, the system is telling you that it’s not functioning correctly. This could mean:

• A failing or drained TPMS sensor battery – The internal battery has died, preventing the sensor from sending tire pressure data.
• Sensor communication issues – If the sensor wasn’t properly reset or installed, the TPMS system may be unable to read it.
• A system-wide issue – In rare cases, the problem could be with the vehicle’s TPMS receiver rather than an individual sensor.

Ignoring a flashing TPMS light means you won’t be alerted if your tires lose pressure, which could be a safety risk.

4. When to Seek Professional Help

If you’ve checked your tire pressure and sensors, but the light continues to flash, it’s time to visit a tire shop or mechanic.

• A professional can scan the TPMS system using a diagnostic tool to pinpoint the exact issue.
• They can determine whether a sensor needs reprogramming, recalibration, or replacement.
• If it’s a battery issue, they may recommend replacing the entire TPMS sensor since most batteries are sealed inside.

Getting a proper diagnosis can save you from guessing and ensure your TPMS system is working as it should.

How to Prevent TPMS Issues

To keep your TPMS system functioning properly and avoid unexpected issues, it's important to check your tire pressure monthly rather than waiting for the warning light to appear. Maintaining proper inflation not only improves fuel efficiency but also helps extend the life of your tires. Additionally, scheduling routine maintenance, such as tire rotations and TPMS sensor inspections, can help catch potential problems early, preventing costly repairs. If your vehicle is over five years old, be prepared to replace TPMS sensors, as their batteries can wear out over time, causing system malfunctions. Taking these proactive steps ensures your tires stay in optimal condition and your TPMS continues to provide accurate alerts.

Final Thoughts

A flashing TPMS light doesn’t always mean your tires are low, but it does indicate a problem within the monitoring system that needs attention. Whether it’s a sensor issue, a dead battery, or a communication problem, resolving it ensures your vehicle can continue warning you of actual tire pressure concerns.

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