Tire pressure in cold weather: Use the right target

The number on your tire sidewall is not your inflation target. Use your vehicle's recommended tire pressure instead, especially when a warning appears after a cold night.

Check before you drive

1. Measure with cold tires before a trip. NHTSA defines cold as a vehicle that has not been driven for at least three hours.
2. Find the recommended pressure on the placard in the driver's door frame or in the owner's manual. Check for different front and rear settings and the setting for your load.
3. Use a pressure gauge on every tire and add air to reach the applicable recommendation. The maximum pressure on the tire sidewall does not replace the vehicle's setting.
4. If your tire pressure monitoring system needs confirmation or calibration afterward, follow the manual. Resetting the warning alone does not fix low pressure.

Why cold weather can trigger the warning

As the air inside a tire cools, its pressure falls while the tire's volume stays roughly the same. A lower reading does not automatically mean a puncture. But the warning still calls for a measurement, not dismissal: what matters is whether the cold tire meets the vehicle's recommendation.

Do not bleed air from a warm tire

Driving warms the tires and raises their pressure again. Do not simply release air from a warm tire to match the cold-pressure target; check again when it is cold. If one tire repeatedly loses pressure, have it checked for a leak or another fault. If a tire is visibly flat or damaged, do not keep driving just to see whether the warning clears.