JKD

I got the same diagnosis from my dealer. It’s not leaking from the split window, but rather from the top passenger side of the glass itself. Bad window seal. Not sure if GM uses the butyl rubber or an elastomeric sealant, but this is definitely a factory defect. BTW, I’m sure we can all agree that any window that opens has the potential to leak if enough water pressure applied. However, a fixed window should not leak and each vehicle should be tested before rolling out the factory door...in my humble opinion.

My sentiment exactly. That’s what I have requested and GM has yet to acknowledge. It makes me think this issue is more prevalent than we yet know. I’m afraid there will be a lot of unhappy owners dealing with this same issue. Thankfully, the dealership is top notch. Not sure if I can mention the name on this forum, but they deserve the business.

I too am a disappointed owner of a 2019 GMC Sierra 1500 Denali. Have had the truck about a month with 2K miles and the rear window leaking as well in the upper right corner. Headliner needs to be replaced and the minimum wait from factory is 2 weeks?!?! Didn’t notice the leak until a trip back from Atlanta in extremely heavy rain. How long had this thing been leaking? Probably from the start. I agree with the previous post, this should not be an issue an owner should have to deal with on a brand new truck, regardless of purchase price. Seems to me a water tight interior is a fundamental requisite for any vehicle. Poor quality control GM, hope you fix this issue at factory by recalibration of the robot that applies the sealant. Hope this is the only QC issue but I can’t help being dubious at this point.