Why Tire Pressure Drops in Cold Weather
Tire pressure falls as the air inside the tire gets colder. Check all tires when they are cold and inflate them to the vehicle maker's pressure on the driver-door label—not the maximum molded into the tire sidewall. A light that stays on after correction may signal a leak or system problem.
What to check and why
Use the vehicle label
Find the recommended cold PSI on the driver-door jamb or in the owner's manual. Why: The sidewall number is usually a maximum for the tire, not the pressure selected for your vehicle.
Measure before driving
Use a reliable gauge when the car has been parked and the tires are cool. Why: Driving warms the tires and temporarily raises the reading, hiding the true cold pressure.
Inspect while you measure
Look for nails, cuts, bulges, cracking, damaged valves and uneven tread on all four tires and the spare if equipped. Why: Cold weather may reveal a slow leak; adding air repeatedly does not repair the cause.
Recheck after a temperature swing
Measure again after a major cold snap and at least monthly. Why: Seasonal temperature changes can move pressure enough to affect the warning system and handling.
When to get professional help
- Pressure drops again within days
- A tire has a bulge, exposed material, deep cut or puncture
- Tread wear is uneven
- The TPMS warning flashes or remains after pressures are corrected
If conditions become unsafe
If a tire is rapidly losing air, visibly damaged or causing the vehicle to pull or vibrate, slow gradually and stop away from traffic. Do not continue on a visibly flat tire unless the vehicle and tire manufacturer specifically permit limited run-flat operation.
Frequently asked questions
What tire pressure should I use in winter?
Use the cold pressure printed on the vehicle's driver-door label or specified in the owner's manual. Do not substitute the maximum pressure on the tire sidewall.
Should I add air when the TPMS light comes on in cold weather?
Measure each tire cold first. Add air only as needed to reach the vehicle maker's specification, then inspect for damage or a recurring leak.
Do winter tires need different pressure?
Follow the vehicle and tire maker's instructions. Do not choose a new pressure solely because the tire is marketed for winter.