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What is TPMS?

TPMS Glossary


Air pressure: Tires require the appropriate amount of air to perform at optimal levels. Under-inflated tires with air pressure below recommended amounts compromise driving safety and lead to increased tread wear.
Direct TPMS (dTPMS): Direct TPMS use pressure sensors located on each tire to measure and monitor its air pressure. A warning indicator light turns on in the instrument panel to warn drivers of under-inflated tires.
Indirect TPMS (iTPMS): These systems measure the rotational speeds for each individual tire. Under-inflated tires have smaller diameters than properly inflated tires. iTPMS is not as accurate due to the way it obtains pressure readings.
Indicator light: Located on the instrument panel for most vehicles, the light turns on when tire pressure drops 25% below recommended levels set by the manufacturer.
PSI (pounds per square inch): Refers to the air pressure of your tires. Vehicles equipped with TPMS alert drivers when at least one tire reaches below the recommended pressure level.
TPMS: A tire pressure monitoring system is an electronic system that uses sensors to monitor the air pressure on each tire. The system is designed to warn drivers when tires are under-inflated. Legislation requires all 2008 model year vehicles and above to be equipped with TPMS.
TREAD Act: The Transportation Recall Enhancement, Accountability and Documentation (TREAD) Act is a U.S. federal law that was passed in the fall of 2000. The law was drafted in response to a rising number of fatalities related to tire failure, click here. The TREAD Act requires all 2008 model year vehicles to be equipped with TPMS.