Why Your Tire Pressure Light Is On—And What to Do About It

Smarter Cars, Safer Roads

Modern vehicles are smarter and safer than ever before, thanks in part to features like the Tire Pressure Monitoring System (TPMS). But while it’s designed to help protect your tires and keep you safer on the road, many drivers don’t fully understand how it works—or what to do when that warning light turns on.


At Raymond’s Tire Shop, we see this all the time. Customers come in unsure if their tires are fine, underinflated, or on the verge of failure. So let’s break it down: what your TPMS light means, why it matters, and how our Boston shop can help you take care of the issue quickly and correctly.

A close up of a car dashboard with a red light on

What Is TPMS?

TPMS stands for Tire Pressure Monitoring System. It’s an electronic system built into most vehicles manufactured after 2007 that alerts you when one or more of your tires are significantly underinflated.


There are two types of TPMS systems:

  • Direct TPMS uses sensors inside the tire to measure air pressure.
  • Indirect TPMS relies on wheel speed sensors (often part of the ABS system) to detect changes in tire rotation that suggest low pressure.



Both systems have the same goal: keep you informed about tire pressure problems before they turn into safety hazards or expensive repairs.

A person is washing a tire with a high pressure washer.

What It Means When the TPMS Light Comes On

When your TPMS light illuminates on your dashboard, it usually means that one or more of your tires is below the recommended air pressure. Sometimes it flickers briefly and goes off again—other times it stays solid or flashes for an extended period. Here’s what each scenario might mean:


  • Solid TPMS Light: One or more tires are underinflated. This is the most common issue and should be addressed as soon as possible.
  • Flashing TPMS Light: This often indicates a malfunction in the TPMS system itself. It could be a dead sensor battery, faulty wiring, or an internal communication error.


In colder climates like Boston, TPMS lights often activate during the fall and winter months because colder air causes tire pressure to drop. This is perfectly normal—but still important to address.

A close up of a car tachometer with the number 3 on it

Why It Matters

Ignoring your TPMS light is risky. Low tire pressure can:

  • Reduce fuel efficiency
    Underinflated tires create more rolling resistance, which forces your engine to work harder and use more fuel.
  • Shorten tire lifespan
    Improper inflation leads to uneven wear, particularly on the edges of your tread, reducing how long your tires last.
  • Increase stopping distance
    Low pressure can reduce traction, especially in wet or icy conditions—something Boston drivers know all too well.
  • Lead to tire failure
    Severely underinflated tires are more likely to overheat or blow out at highway speeds.


In short, that little dashboard light isn’t something to ignore.

A man is changing a tire on a car in a garage.

How Raymond’s Tire Shop Can Help

If your TPMS light comes on, Raymond’s Tire Shop is ready to help you get back on the road with confidence. Here’s what we offer:


1. Tire Pressure Check

We’ll start by checking all four tires and your spare (if applicable) to see if one is underinflated or leaking. If it’s just a matter of topping off the air, you’ll be out the door in no time.

2. TPMS Diagnostics

If the light is flashing or won’t go off even after reinflating, we’ll run a diagnostic scan. This allows us to check for sensor issues or communication problems within the TPMS system.


3. TPMS Sensor Replacement

TPMS sensors don’t last forever—typically around 5–10 years depending on usage and battery life. If a sensor has failed, we can replace and reprogram it to your vehicle’s system.

A black and white photo of the dashboard of a car.

4. Full Tire Inspection

Sometimes a persistent TPMS light points to a slow leak, worn valve stem, or internal damage. We’ll inspect the tires thoroughly to identify the root cause.


Don’t Guess—Get It Checked

Your TPMS light is your car’s way of saying something’s not right. Don’t ignore it—and definitely don’t rely on visual checks alone. Many tires can appear fine while being several PSI too low.


If you’re in the Boston area and that little light won’t leave you alone, bring your vehicle to Raymond’s Tire Shop. We’ll diagnose the issue, fix the problem, and help you drive away safely with peace of mind.



No guesswork. No unnecessary upsells. Just honest, expert tire service from a shop that’s been serving Boston drivers for years.

A close up of a car wheel with a tire on it
A man is kneeling down to change a tire on a car.
A close up of a tire on a white car
A close up of a car wheel on a brick road.
A man is kneeling down next to a car to inflate a tire.
A close up of a tire with a green background

What the DOT Date Code on a Tire Can Tell You

October 7, 2026
Tire tread gets a lot of attention, but tread depth is not the only factor that matters. Tires also age . Even when a tire still has visible tread, the rubber compounds can gradually change over time because of heat, sunlight, weather exposure, and normal use. That is why knowing how to read the DOT date code can help drivers understand how old a tire really is.  The date code does not tell you everything about tire condition, but it provides an important piece of the overall picture.

How to Tell If a Wheel Is Bent After Hitting a Pothole

October 1, 2026
A hard pothole impact can do more than damage a tire. The force can also bend a wheel, especially if the pothole is deep, the vehicle is moving quickly, or the tire has a lower-profile sidewall with less cushioning between the road and rim. Sometimes the damage is obvious. In other cases, the wheel may look normal but cause vibration, air loss, or handling problems.  Knowing what to watch for after a pothole strike can help drivers catch wheel damage before it creates additional tire or suspension problems.

What Does a Flashing TPMS Light Usually Mean?

September 23, 2026
Most drivers are familiar with the tire pressure monitoring system , or TPMS, warning light. When it stays on steadily, it usually means one or more tires may be underinflated. A flashing TPMS light often means something different. Instead of simply warning about low tire pressure, a flashing light can indicate a problem with the monitoring system itself. That could involve a sensor, sensor battery, communication issue, or another TPMS-related fault.  Knowing the difference can help drivers avoid assuming that adding air will automatically solve the problem.

Why Older Tires May Need Replacement Even With Good Tread

September 22, 2026
Tread depth is one of the first things drivers look at when deciding whether a tire still has life left. Deep grooves can make a tire appear healthy, especially if the vehicle is not driven very often. But tread is only part of the picture. Tires age even when they are not being used heavily. Over time, rubber compounds can harden, dry out, and become less flexible. That means an older tire may still have plenty of tread while no longer performing the way it did when it was newer. Rubber Changes With Age Tires are constantly exposed to oxygen, heat, sunlight, moisture, and changing temperatures. Those conditions gradually affect the rubber. As a tire ages, the material can lose some of its elasticity. That may reduce its ability to flex properly as it rolls and responds to the road. A tire that looks acceptable at a quick glance may therefore be significantly older than its appearance suggests. This is especially important for vehicles that accumulate very few miles each year.

What Makes a Tire Puncture Repairable?

September 11, 2026
A flat tire does not always mean the tire has to be replaced. In many cases, a small puncture can be repaired safely and returned to service. The key is where the puncture occurred, how large it is, and whether the tire suffered additional damage while losing air. That is why a professional inspection matters. Two punctures that lo ok similar from the outside may require completely different solutions once the tire is removed and examined internally. Location Matters Most One of the first things a technician looks at is where the puncture is located. Damage in the central tread area is often the best candidate for repair. This part of the tire is designed to handle contact with the road and can sometimes be repaired when the puncture is small and otherwise straightforward. Punctures near the shoulder or sidewall are much more concerning.  These areas flex significantly while the tire is moving and cannot usually be repaired safely using standard puncture-repair methods. If a nail, screw, or other object damages the sidewall or outer shoulder, replacement is often the safer option.

How Worn Suspension Parts Can Make Alignment Difficult

September 6, 2026
A wheel alignment can correct important steering and tire-angle settings, but the alignment itself depends on the suspension being in good mechanical condition. If ball joints, tie rods, control arm bushings, wheel bearings, or other components are worn, the wheels may not stay in the position the technician sets.  That is why some vehicles continue pulling , wearing tires unevenly, or developing an off-center steering wheel even after an alignment. In those cases, the problem may not be the alignment machine or the adjustment. It may be worn suspension or steering components underneath the vehicle.