2020 AT4 1500 Sierra. Anyone had any leaks on the back glass? According to the dealership it's coming from underneath the spoiler. It seems they have 2 nuts and if I heard them right the sealant was the issue. I have the extended warranty which of course doesn't cover "water leaks". The truck is 1.5years old and while I am over the 36000 mile warranty I am still within the 3 year. I know that it's 3/36000 but you would think since this is a fixed piece of equipment they would cut you a little slack. To me it seems like poor workmanship. Sub-par work. The cost is $711 to fix. Needless to say I am very dissatisfied with GM ability to stand behind what they sell. My paint is coming off around my fog lights and my grill. Talked to the dealership " normal wear and tear". I have pretty much only own GM. Probably my last buy. My wife will be in the market soon. 2012 Enclave with transmission issues because GM used cheap parts. She wanted a Tahoe. Don't t hink so!! Just sad you spend that much money on a vehicle and you end up with something like this. Should have learned my lesson with my cracked dash of my 2008.