2020 Silverado Ceiling leak

[Emanzano]

Hey guys,

I have a 2020 Silverado RST with a sunroof. About a year ago it started leaking every time it rains heavily. I have taken my truck 5-6 times to 3 different dealerships and they all say that they can’t find why it leaks. I have done 2 GM claims and they are useless. They told me that they can’t fix it if the dealership doesn’t diagnose the problem, and to take it whenever it leaks. Here in Houston it has rained when the dealership is closed, and my warranty is about to expire in 2 weeks. Has anyone gone thru this?? It leaks just on the passenger side at the corner of the sunroof where the onstar speaker is at.

[2016 Sierra Owner]

There are drain holes in the corners of the sunroof. You can see them if you stand with the roof open and push the screen down. Some people take a small weedeater line and carefully run it down the drain holes.

[davidr83]

My 2021 did the same, they replaced the entire sunroof assembly and it was good after for about 5mths. One heavy rain and leaked again but hasnt leaked since that one time. Check the drains but they are still kind of hard to see if you do what above post said. and also check the fin antenna next to the sun roof, i found mine to be a little loose and i think that may be where the leak came from. If the sunroof leaks during heavy rain, sit inside and get it on video. Thats what i did to prove it was initially leaking