2020 Silverado LTZ Crew Cab with 18,000 miles and I joined the window leak club. Thankfully my husband follows many Chevy sites and has been watching for this , so we caught it right away.
Dealer stated that GM has a notice out and they have to silicone it first, so currently its at the dealership where they hire a window company to come and fix. It sounds like they remove the 3rd brake light piece that runs along the top of the entire back window, they will silicone and re-position it, then it has to sit in a heated garage for like 24 hours and I should have it back in a day or two. If it leaks again, then they have the glass company replace the window. My question to all of you who that have dealt with this, after you had it silicone' d, did you have any other issues with the window leaking?