Every vehicle manufactured since 2008 weighing less than 10,000 pounds is equipped with a system that warns the driver of low air pressure in the tires. This system is commonly referred to as the Tire Pressure Monitoring System, or TPMS. When the system senses that the air pressure in a tire drops below a predetermined amount you will receive a warning indicator.
Depending on the vehicle, the low air pressure warning will be either an illuminated light (called a Malfunction Indicator Lamp or MIL), or a message on the vehicle’s information system alerting you to the low air pressure. Some vehicle have both a MIL and a message. If your vehicle has a MIL, it will either be the words “TPMS” or it will be the cross-section of tire with an exclamation point inside of it.
How does the TPMS determine that the air pressure in your vehicle’s tire is low? There are two different type of systems, direct and indirect. (more…)