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I was concerned reading about this on my 2021 Tahoe ( I have serious mold allergies) so I opened my sunroof, stood through it, and poured bottled water into the 4 corners of the drain 'gutter' around the opening (one at a time) and confirmed that the water drained out to under vehicle completely each individual time. I've noticed mine was built the first week of December 2020, so I'm assuming issues have been corrected over time (I hope).
 

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2021 Yukon Denali
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Curious to see what came of your issue. Did they replace your vehicle due to water damage? I, too, had water come in from the sunroof on my 2021 Tahoe. Started 2 mos ago and water poured in through the roof console (where sunroof controls are), then through the rear passenger dome lights. Noticed water streaks on the front door jams. Could hear water sloshing above cabin. Put in shop for 3-4 weeks where the removed headliner, had to replace the sunroof and ultimately the motor in the sunroof cover after it was damaged by water. Morning after getting it back, when I cranked it, I had no electronics-no backup camera, no touch screen, no radio, no driver command center (in dash behind steering wheel)--all blank-non operational. Took it back but with holidays, no one was available to determine what they were going to do. Picked it back up & have had the electronic failure twice since. I fear it will never end--who knows how much water went into the dash or could have affected the control panels/computers. I, too, have asked for GM to replace it. Back in shop now & they are working toward that but GM doing every conceivable test, diagnosis to keep from having to replace. Thankfully, the dealership owner is involved and advocating on my behalf. What a mess.
I just took it in yesterday. The dealer water tested it and discovered that it is leaking but they are trying to determine where it is leaking. I will keep you posted.
 

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The dealership called the the same day and advised the driver side sunroof drain tube wasn't properly installed at the factory and therefore each time it rained water was coming into the cabin at the 3rd row floorboard.
Dealership has given me a 2021 Tahoe loaner and stayed the carpeting would be replaced under warranty. I have a case # opened with GM corporate to see if they'd repurchase vehicle since it basically has water damage (and for future wiring after warranty). Tahoe costed $85,000 and only has 3,800 miles😵😵😵Haven't heard back yet. Anyone have a corporate contact???
Curious to see what came of your issue. Did they replace your vehicle due to water damage? I, too, had water come in from the sunroof on my 2021 Tahoe. Started 2 mos ago and water poured in through the roof console (where sunroof controls are), then through the rear passenger dome lights. Noticed water streaks on the front door jams. Could hear water sloshing above cabin. Put in shop for 3-4 weeks where the removed headliner, had to replace the sunroof and ultimately the motor in the sunroof cover after it was damaged by water. Morning after getting it back, when I cranked it, I had no electronics-no backup camera, no touch screen, no radio, no driver command center (in dash behind steering wheel)--all blank-non operational. Took it back but with holidays, no one was available to determine what they were going to do. Picked it back up & have had the electronic failure twice since. I fear it will never end--who knows how much water went into the dash or could have affected the control panels/computers. I, too, have asked for GM to replace it. Back in shop now & they are working toward that but GM doing every conceivable test, diagnosis to keep from having to replace. Thankfully, the dealership owner is involved and advocating on my behalf. What a mess.
 

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Bought my 2021 Denali on Dec 5th and noticed water sitting in drivers side floorboard Jan 1st. Thankful for my weathertech mats I was able to see the water without it soaking in the carpeted mats. Called the dealership the following day (Jan.2nd) and they said to bring it in. I stupidly went through the car wash before dropping it off and noticed the water coming out of the corner front dash and where the fuse plugs in. Showed the dealer when I dropped it off. I’m in a loaner and they’ve had it for almost 3 weeks now. They can’t figure out where the leak is coming from. Got a call today saying someone is coming out from GM to look over it. She did tell me they got a bulletin from GM about extending the drains from the sunroofs. I know this water has been through all the electrical in the dash and I’m not willing to pay over $80k and have it less than a month for these issues. I plan on asking for a new vehicle once I go in next week to see what GM has seen on my car. I also have pictures that I feel will show this wasn’t the first time this happened, however I didn’t notice with the cloth mats as I think it soaked the water up.
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