Short Answer
Complete Explanation
The TPMS (Tire Pressure Monitoring System) light is a dashboard indicator that alerts the driver when one or more tires are significantly under‑inflated or over‑inflated. Modern vehicles use either direct sensors mounted on each wheel or indirect methods that monitor wheel speed variations to detect pressure loss. When the system determines that tire pressure falls outside the manufacturer‑specified range, the TPMS icon illuminates, prompting the driver to check and correct tire pressure.
- Indicator Light Symbol:
Typically a stylized cross‑section of a tire with an exclamation mark or the letters “TPMS.” The light may flash briefly on startup and stay illuminated if a fault is detected. - Possible Causes:
Slow leak, puncture, valve stem damage, temperature‑related pressure changes, sensor failure, or a malfunctioning TPMS module. - Recommended Actions:
Stop safely, inspect tire pressure with a gauge, inflate to the recommended PSI, and reset the TPMS if required. Persistent illumination may require sensor replacement or professional diagnosis.
Common Misconceptions
The TPMS light only appears when a tire is completely flat.
The light activates when pressure deviates by about 25% from the recommended level, not only when a tire is flat.
Resetting the TPMS clears any safety issue.
Resetting only silences the warning after the pressure is corrected; underlying leaks or sensor faults must still be addressed.
FAQ
Why does the TPMS light flash when I first start the car?
The TPMS performs a self‑check on startup; the light flashes briefly to confirm all sensors are communicating. If it stays on, a fault is detected.
Can cold weather cause the TPMS light to turn on?
Yes. As temperature drops, tire pressure naturally decreases, which can trigger the TPMS warning if the pressure falls below the threshold.
Do I need special tools to reset a TPMS?
Many vehicles reset automatically after the tires are inflated to the correct pressure. Some models require a manual reset using a button on the dash or a scan tool.
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