Join Date: Jan 2011
Location: Cambridge IL - USA
Not sure, but I was under the impression that low-warning was triggered by one tire being "significantly" different in pressure from the others. But, I could be wrong...again !
Prior to the individual wheels having a sensor installed; the low tire alert was triggered by the ABS sensors that measured rotational speed of the wheels. This was called an indirect TPMS system. A wheel that was rotating at a significantly higher speed due to a lower pressure would set off the alert.
The latest systems measure the actual pressure of the individual tires with a sensor mounted within the wheel. This is called a direct TPMS system. There is a programmed threshold that will set off an alert if any tire gets below a specific value.
Running a pressure that is 5psi lower than the specified pressure will likely/frequently set off an alert, especially when seasonal colder ambient temperatures occur.
2019 Chevy Equinox; 2.0 - LT - FWD - Silver Ice/Redline - Purchased 10/20/2018; Mills Chevrolet, Davenport IA
2016 Chevy Equinox; 3.6 - LTZ-AWD - Black/Black - Purchased 7/7/2016; Mills Chevrolet, Davenport IA
2017 Chevy Malibu; 1.5 - LT - Pepperdust - Purchased 8/2017; Green Chevrolet, East Moline, IL
2009 Chevy Silverado; 5.3 -LT - 4WD - Ext. Cab - Granite Met. - Purchased 02/2009; Green Chevrolet, East Moline IL
Last edited by garbec01; 08-09-2019 at 03:25 PM.