Tire Pressure Warning Light (TPMS): What to Do When It Turns On
Updated: February 2026
The tire pressure monitoring system (TPMS) light looks like a tire cross-section with an exclamation point. It illuminates when one or more tires have dropped at least 25% below the recommended pressure, indicating a potential safety hazard.
Why Proper Tire Pressure Matters
Underinflated tires reduce fuel economy, cause uneven wear, increase stopping distances, and raise the risk of tire blowouts. Overinflated tires provide a harsh ride and are more susceptible to damage from potholes or debris. Proper inflation is critical for safe vehicle handling.
What to Do When Light Appears
- Check all tire pressures as soon as possible using a tire gauge
- Inflate tires to the pressure specified on the driver's door jamb sticker
- Don't use the maximum pressure printed on the tire sidewall
- Check the spare tire as some vehicles monitor spare pressure too
- If one tire is significantly lower than others, inspect for punctures or damage
- After inflating, drive for a few minutes - the light should turn off
When It Flashes
A flashing TPMS light indicates a malfunction in the monitoring system itself, not a tire pressure issue. The system may have a faulty sensor, dead sensor battery , or communication problem. Have the system diagnosed by a tire professional.
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Frequently Asked Questions about Tire Pressure Warning Light (TPMS): What to Do When It Turns On
Is Tire Pressure Warning Light (TPMS): What to Do When It Turns On suitable for beginners?
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