Why Does My Low Tire Pressure Light Keep Coming On?: 1 Minute to Understand Tire Pressure Issues

The low tire pressure light on your car’s dashboard is designed to alert you whenever one or more tires are significantly underinflated—usually 25% below the recommended pressure. If your low tire pressure warning keeps popping up, it generally signals that the air pressure in at least one tire is dropping below safe levels. The causes can range from temperature fluctuations, small punctures, faulty tire pressure sensors, gradual leaks due to aging valves, or even a simple issue like not topping up your tires often enough. In cooler weather, air molecules contract, causing tire pressure to dip, which can trigger the warning even without a leak. Damage from curbs, nails, or other road hazards can also cause slow leaks that repeatedly activate the sensor. Regularly checking your tire pressure and inspecting your tires for visible damage or embedded objects is crucial for safe driving.

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FAQ

Q: Can cold weather cause my low tire pressure light to come on?

A: Yes, cold weather causes tire pressure to drop, sometimes enough to trigger the warning light even if there’s no physical leak.

Q: What should I do if my low tire pressure light won’t turn off after inflating my tires?

A: Double-check the pressure with a gauge, reset the light if your car allows, or visit a mechanic—sometimes sensors can malfunction or need recalibration.

Q: How often should I check my tire pressure?

A: Check at least once a month and before longer trips—more frequently if the weather changes or the warning light appears.

Q: Is it safe to drive with the low tire pressure light on?

A: It’s risky. Low tire pressure affects handling and braking and increases the chance of a blowout. Address the issue promptly.

Q: Do tire pressure sensors wear out over time?

A: Yes, tire pressure monitoring system (TPMS) sensors have batteries that typically last 5–10 years and may need replacing.