Why Your TPMS Light is Flashing on the First Cold Day of Winter
Why does the TPMS light come on in winter?
Cold temperatures reduce air pressure inside tires. For every 6°C drop in temperature, tire pressure decreases by about 1 PSI. When pressure falls 4 to 8 PSI below the recommended level, your TPMS sensor triggers a warning light. This is normal behavior and doesn't indicate a tire problem.
Understanding Your TPMS System
Tire Pressure Monitoring Systems are safety features required on all vehicles since 2008. TPMS sensors in each wheel monitor pressure and transmit readings to your vehicle's computer. When pressure drops below a threshold (typically 4 to 8 PSI below recommended), the system alerts you with a warning light. TPMS helps prevent blowouts and improves fuel economy.
The Winter TPMS Alert Pattern
On the first cold morning of the season, overnight temperature drops trigger TPMS alerts across many vehicles simultaneously. Your tires were properly inflated at a warmer temperature. Overnight cooling reduces pressure. As the day warms and you drive, friction heats the tires and pressure rises, often turning off the light. This is normal and expected behavior.
When Your TPMS Light Means Action is Needed
- Light comes on and stays on while driving: Possible puncture or slow leak
- Light flashes then turns off: Normal temperature-related pressure change
- Light stays on after tires warm up: Possible sensor malfunction or persistent leak
- Light comes on only in cold mornings: Normal winter behavior, not urgent
What to Do When Your TPMS Light Activates
First, check tire pressure when tires are cold, before driving or at least three hours after driving. Compare readings to the manufacturer's recommended PSI on the driver's door jamb. If pressure is 4 to 8 PSI low due to overnight cooling, inflate to the correct level. The light should turn off within a few miles of driving as tires warm up.
TPMS Sensor Battery Life
TPMS sensors have batteries that last 5 to 10 years. If your vehicle is older and the light stays on after proper inflation, the sensor battery may be failing. Replacement sensors cost $50 to $100 each, typically less than $400 for all four. A local mechanic can diagnose and replace faulty sensors.
Preventing Winter TPMS Alerts
Check tire pressure before the first cold snap. Inflate to the manufacturer's recommended PSI. During winter, check pressure more frequently, especially after significant temperature drops. Proper inflation prevents most winter TPMS alerts and ensures your tires remain safe.
Frequently Asked Questions
Should I inflate my tires when the TPMS light comes on?
Only if pressure is below the manufacturer's recommendation. Check pressure when cold. If low, inflate to the recommended level. Never exceed the maximum PSI on the tire sidewall.
Is it safe to drive with the TPMS light on?
If the light is due to cold temperature and pressure is still above 20 PSI, short drives are usually safe. However, have the pressure checked and corrected soon. If pressure is very low or the light stays on, drive slowly to a tire shop.
Can I ignore the TPMS light?
No. The light indicates pressure is outside safe parameters. Check and correct the issue. Ignoring it risks blowouts and reduced fuel economy.
Why doesn't my TPMS light turn off after inflating?
The light may take a few miles of driving to turn off as the system recalibrates. If it stays on after driving, a sensor may be faulty or pressure may still be low.
TPMS Light Diagnosis and Tire Pressure Check
Confused by your TPMS warning? A local tire shop can check pressure, diagnose the cause, and fix any issues.
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