bowtie2007

I did not think about NHTSA but I have filed a complaint with the BBB and FTC claiming a violation of the written warranty. I don't know how they can have a cracked window frame and just put sealant over the cracks instead of a replacement part. I don't know anything about how class actions lawsuits work or I may have tried that. tbully, I'm glad you got the replacement window instead of the sealant!

The rear sliding glass window of my 2020 GMC Sierra 2500 developed a leak in January of 2021. It caused water to saturate the carpet under the rear seats and allowed water to enter the rear seatback storage compartments. TSB 18-NA-383 states the cause is from cracks developing in the rear sliding window plastic upper rail glass guide and the solution instructs dealers to put seam sealant over the cracks. Skip forward a year later and 3,000 miles out of factory warranty. The sealant failed and the window was leaking again. GM initially refused to pay anything and the dealer wanted $1,382.70 because they stated I needed a full rear window replacement. Extended warranty wouldn't cover it because it was not a mechanical breakdown. After a many calls to GM customer assistance, they agreed to cover 70% leaving me to still pay $414. This window leak is not isolated to just a few. I had a 2019 GMC Sierra 1500 in which the rear window leaked before I traded. A friend of mine has a 2020 GMC Sierra 2500 and his window is leaking. GM will try to put a bandage on the window cracks in the form of sealant instead of actually replacing the defective window. Many of the people in the forums report that the sealant does not last as was the case with mine. If you are unlucky enough to fall outside of warranty when the sealant fails, GM will not cover anything without a fight.

The rear sliding glass window of my 2020 GMC Sierra 2500 developed a leak in January of 2021. It caused water to saturate the carpet under the rear seats and allowed water to enter the rear seatback storage compartments. TSB 18-NA-383 states the cause is from cracks developing in the rear sliding window plastic upper rail glass guide and the solution instructs dealers to put seam sealant over the cracks. Skip forward a year later and 3,000 miles out of factory warranty. The sealant failed and the window was leaking again. GM initially refused to pay anything and the dealer wanted $1,382.70 because they stated I needed a full rear window replacement. Extended warranty wouldn't cover it because it was not a mechanical breakdown. After a many calls to GM customer assistance, they agreed to cover 70% leaving me to still pay $414. This window leak is not isolated to just a few. I had a 2019 GMC Sierra 1500 in which the rear window leaked before I traded. A friend of mine has a 2020 GMC Sierra 2500 and his window is leaking. There are hundreds of pages of forums in the 1500 forums regarding a leaking rear window. GM will try to put a bandage on the window cracks in the form of sealant instead of actually replacing the defective window. Many of the people in the forums report that the sealant does not last as was the case with mine. If you are unlucky enough to fall outside of warranty when the sealant fails, GM will not cover anything without a fight.

That could be from the window. Both my compartments had water in them from my window leaking.

I also got def quality warnings with blue platinum. Stopped using it and the messages haven't returned.

To comment on the 2500s, I came over to this forum because there is way more information on the leaking windows. I have a 2020 Sierra 2500 and the rear window first started leaking at 20,000 miles. The dealership sealed it but a year later, it has started leaking again. The sealant does not appear to be a long term fix.

My rear window was leaking when it had about 20,000 miles. The dealership followed the TSB and sealed it. It is about a year later and I just noticed today that it is leaking again. I haven't seen another TSB and it appears that they removed the old one. I'm afraid to bring mine back because they damaged my headliner last time and had to remove and replace my front windshield to get a new headliner in. At least they had loaners at that time.

Mine was doing this as well and i brought it in to the dealer. My repair order said, "replaced reducant reservoir with level sensor and harness, reset reducant level, reset nox catalyst reducant loading, enabled regeneration, and verified repair." Mine has been reading correctly since the repair. Side note... they had to order the parts and it took over a month to come in, it didn't happen in a day like it sounds.

I have an Imagine 2670mk and ran the camera wires underneath. No problems and it's been 2 years. I just ran it along the frame to the rear. Sent from my SM-G981U using Tapatalk

My GMC puddle lamps are not parallel on my 2500. Sent from my SM-G981U using Tapatalk

The tires on mine make a noticeable difference. After my first rotation, the truck was constantly pulling left as described. After the following rotation where the front tires were returned, it was centered again. I have rotated the tires 3 times and each time i bring the rear tires to the front, it pulls. Sent from my SM-G981U using Tapatalk

I finally got mine yesterday. Sent from my SM-G981U using Tapatalk

My previous 2019 Sierra 1500 with rear slider leaked. My 2020 Sierra 2500 with rear slider leaked. 2 for 2. Sent from my SM-G981U using Tapatalk

I just got mine back from the dealer but once i got home, i saw the headliner was damaged with a trim tool on both sides. The headliner is also loose and just resting on the window track. The headliner clips are broken. Taking it back to the dealer in the morning... Sent from my SM-G981U using Tapatalk

The dealer is blaming the fluid on splash back from the aftermarket Fumoto drain valve. I doubt that but I'll take it off, clean everything and monitor it after. Sent from my SM-G981U using Tapatalk