If you've ever started your car on a chilly morning only to be greeted by a glowing tire pressure warning light, you're not alone. And if that pressure falls below the threshold set by your vehicle's Tire Pressure Monitoring System (TPMS), the dashboard warning light turns on. Instead of resetting the system, grab a tire pressure gauge and check all four tires—plus the spare if your vehicle uses one with a pressure sensor. One Honda Element owner described their tire pressure warning light appearing during colder mornings, then disappearing after temperatures warmed up. The Bottom LineYour tire pressure warning light isn't necessarily bad news when temperatures plunge.