I have a 2008 Solstice, and today I got the "Service Tire Monitor" message. The readings for all four tires are missing. I doubt all 4 sensors went bad or had the batteries die at the same time, and temperature isn't as issue - it was almost 70 degrees today. Anyone had this happen? I've heard the TPMS module is combine with the RKE module, but I don't have RKE.