Same problem here, as well as 2 failed Trailer Brake modules. Mine has heated and ventilated seats. My truck is in for the 3rd time with either very weak seat heater performance, or no seat heater. Sometimes they work and others not at all, but they are never very warm. The dealer replaced the bottom element on the drivers side, but nothing else. I tried to explain that that would do nothing for the back but they replaced it anyway. The temp is -4 right now, so the seat heater would be nice to have. $50K truck is in their garage while I drive a Rent a Wreck. I've owned several GM trucks with no issues. After 5 months and 8,000 miles I'm getting a little concerned. Rides great but electrical gremlins might kill my love...