Symptoms
- Dashboard tire icon lit up (often looks like a horseshoe with an exclamation point)
- Light comes on after temperature drops
- Light stays on even after adding air
- Light flashes then stays solid
Likely causes
- CommonOne or more tires low on airCold weather alone can drop pressure enough to trigger the light.
- CommonSlow leak in a tireA puncture or valve leak that keeps letting air out will re-trigger the light.
- PossibleFaulty or low-battery TPMS sensorSensors have batteries that eventually die, usually after 5–10 years.
- Less commonSpare tire pressure lowSome vehicles monitor the spare too.
What to do
- Check the pressure in all four tires (and the spare if monitored) with a gauge, ideally when tires are cold.
- Compare to the PSI listed on the driver's door jamb sticker, not the number on the tire sidewall.
- Add or release air to reach the correct pressure.
- Drive a few miles to let the system recheck; the light often resets on its own once pressure is corrected.
- If the light stays on with correct pressure, look for a slow leak using soapy water on each tire.
- If no leak is found, the issue may be a sensor; a shop can scan which sensor is reporting a fault.
Tools and parts
- Tire pressure gauge
- Air compressor
Replacement TPMS sensorSearch: “TPMS sensor for [your car make and model]”
When to call a pro
If pressure is correct in all tires and the light still won't clear, a shop can diagnose which sensor is faulty and reset the system.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.