My 08 Silverado I run sensors in the winter wheels, but not in my summer wheels. Not running sensors, the light normally doesn't come on, unless I run about 10 miles down the highway, but around town it is always off, until today. Said right rear tire was low. Tires with the sensors are stored in an enclosed trailer next to where I park. So I checked the tires in the trailer, and sure enough the one that was supposed to be on the RR was low. Filled it back up and the light went off. Strange.