Tyre Pressure Warning Light On? Here’s What Brisbane Drivers Should Do

Have you noticed a yellow warning light on your car dashboard that looks like a tyre with an exclamation mark?

This is commonly called the tyre pressure warning light. It is part of your vehicle’s Tyre Pressure Monitoring System (TPMS), where fitted.

While the warning may seem minor, it should not be ignored.

Low tyre pressure can affect vehicle handling, braking, fuel efficiency and tyre life. In some situations, it may indicate a puncture or another problem that requires urgent attention.

If your tyre pressure warning light is on, this guide explains what it means, why it appears and what you should do next.

What Does the Tyre Pressure Warning Light Mean?

A tyre pressure warning light usually indicates that one or more tyres may be underinflated.

Many vehicles use a system called TPMS to alert drivers when tyre pressure drops below a specified threshold.

There are two main types of systems.

Direct TPMS

A direct TPMS uses sensors to measure tyre pressure.

These sensors are commonly fitted within the wheel assemblies.

The system can alert the driver when pressure becomes too low.

Some vehicles also display the individual tyre pressures on the dashboard.

Indirect TPMS

An indirect TPMS uses information from the vehicle’s wheel-speed sensors to identify changes that may indicate an underinflated tyre.

These systems generally do not measure actual tyre pressure.

Instead, they detect differences in wheel rotation characteristics.

The operation and warning behaviour vary between manufacturers.

Always refer to your vehicle owner’s manual for the correct interpretation.

5 Common Reasons Your Tyre Pressure Warning Light Comes On

Several problems can trigger the warning.

1. Low Tyre Pressure

One of the most common reasons is insufficient air pressure.

Tyres can gradually lose pressure over time, even without a puncture.

If the pressure falls below the system’s warning threshold, the dashboard light may appear.

What to do: Check all tyres with an accurate pressure gauge and adjust them to the vehicle manufacturer’s recommended cold inflation pressures.

2. A Nail or Screw in the Tyre

A sharp object can become embedded in the tyre tread.

Sometimes the tyre loses air slowly, allowing you to drive for several days before noticing a problem.

Warning signs include:

• Repeated pressure loss
• A visible nail or screw
• A tyre that looks lower than the others
• The warning light returning after inflation

If you suspect a puncture, arrange a professional inspection.

Not every puncture can be repaired safely.

3. Changes in Temperature

Tyre pressure changes as temperature changes.

A drop in ambient temperature can reduce tyre pressure, even when the tyre is not leaking.

This may trigger a warning if the pressure was already near the system’s threshold.

Brisbane drivers may notice pressure differences during seasonal weather changes.

Always check inflation pressures when tyres are cold and use the manufacturer’s recommended settings.

4. A Faulty TPMS Sensor

Sometimes the warning light indicates a problem with the monitoring system rather than low tyre pressure.

Possible issues include:

• A failed sensor battery
• A damaged sensor
• A communication problem
• Incorrect sensor programming
• A system fault after wheel or tyre work

On some vehicles, a flashing warning light that becomes steady can indicate a TPMS malfunction.

The exact behaviour depends on the vehicle.

If the tyres have the correct pressure but the warning persists, the monitoring system may need diagnosis.

5. Tyre Replacement or Wheel Changes

A tyre pressure warning may appear after wheels or tyres have been changed.

Possible causes include incorrect inflation pressure, a system that needs recalibration, or a sensor that is not communicating correctly.

Some vehicles require a reset or relearning procedure after relevant tyre maintenance.

Follow the manufacturer’s instructions or ask a qualified technician for assistance.