Roof leak

[BUDMANZ71]

I brought my truck to the dealer and they diagnosed the leak as the third break light.   I brought it home and put some rtv sealant on it and put it all back together.   Came out after some rain about a week later and it still leaked.   Could it be the sunroof?   I checked the drains and water leaked out as it should behind the front tires.   It seems a little far forward for it to be the third break light.   I just took it off again and re sealed it and put some clear silicone on the outside of it.   Any help would be appreciated.   Thanks. 

[Omar Alvarado]

I got the same problem but not that bad.....mine is just a line in the back that goes side to side. Idk why but i used the chemical guys headliner cleaner and worked

[Jaychevy81]

Did you check the back drains there are 4 one on each corner.


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[Borntorun]

I had leak but mine was from shark fin on roof. Water was around overhead compartment. No staining. Actually leaked twice was told by dealer there was a change made on what sealant to use.

[BUDMANZ71]

Well after re sealing the brake light and putting some clear rtv on the outside I brought it through a touchless wash and we had heavy rains with no leaks....heres to hoping it's fixed.

[Bordo3k]

my 2014 Sierra was taking in water- headliner was soaked around the part of the roof where the onstar and sunroof buttons are. Research and an auto body expert both told me it was the shark fin XM antenna.They called the dealer next door and they confirmed that it is a continuing issue they see all the time. The seal gets damged when the vehicle goes through a car wash with brushes. Tried RTV clear silicone but did not fix the problem. Finally paid the money and had the auto body shop replace the shark fin. They reinforced it with some kind of tape (buttle tape or something? Cant remember) in hopes that it may help prevent another damage. They showed me how the seal was all busted up and they showed me the bracket that held the shark fin on- it was very corroded. Apparently if left unfixed it could possibly short out your display screen and other electronics. I think 250 in parts and labor was pretty good to get it fixed right. I took it to Monticello Auto Body in Monticello MN. The Chevy dealership wanted to charge me double.

[BUDMANZ71]

They originally replaced the shark fin and then when I brought it back again they said the third brake light.   But my extended warranty does not cover the third brake light. 

[Borntorun]

4 hours ago, Bordo3k said:

my 2014 Sierra was taking in water- headliner was soaked around the part of the roof where the onstar and sunroof buttons are. Research and an auto body expert both told me it was the shark fin XM antenna.They called the dealer next door and they confirmed that it is a continuing issue they see all the time. The seal gets damged when the vehicle goes through a car wash with brushes. Tried RTV clear silicone but did not fix the problem. Finally paid the money and had the auto body shop replace the shark fin. They reinforced it with some kind of tape (buttle tape or something? Cant remember) in hopes that it may help prevent another damage. They showed me how the seal was all busted up and they showed me the bracket that held the shark fin on- it was very corroded. Apparently if left unfixed it could possibly short out your display screen and other electronics. I think 250 in parts and labor was pretty good to get it fixed right. I took it to Monticello Auto Body in Monticello MN. The Chevy dealership wanted to charge me double.

Dealer replaced my rubber gasket and use a new sealant that I was told they changed too . Second time for same repair on my 14 serria and my truck doesn't go thru car wash so I think there maybe more to problem. 

[Bordo3k]

Pretty sad that we have these issues with water. Very unacceptable. I had a lot of respect for GM until I bought this truck and now myself and thousands of others are having roof leak issues. This should have been a massive recall. Then they go and announce they are shutting down a handful of factory’s and moving out of the country. What a joke. 

[Jacoby]

Was taking my daughter to school the other morning and it was raining.  While driving down the highway water started dripping from right where the visor rod goes into the ceiling.  Sure enough right above that is the satellite antenna.

[SS502]

39 minutes ago, Jacoby said:

Was taking my daughter to school the other morning and it was raining.  While driving down the highway water started dripping from right where the visor rod goes into the ceiling.  Sure enough right above that is the satellite antenna.

Is the gap on your antenna seal on the backside? They moved that (not sure why there is ANY gap) to the front side now. I live in Florida where we get rain quite often, went through hurricane Michael and the self serve car wash with the high pressure water and have no leaks YET. I plan on filling that gap with some white RTV since my truck is white. I agree with others, this is pretty unacceptable on any car/truck made today.

[Jacoby]

I just went and looked and yeah there's like a little square opening or a "gap" as you put it.  I'll be damned.  Guess its time to break out the silicone.  We got 3 days of rain in the forecast starting tomorrow

[SS502]

1 hour ago, Jacoby said:

I just went and looked and yeah there's like a little square opening or a "gap" as you put it.  I'll be damned.  Guess its time to break out the silicone.  We got 3 days of rain in the forecast starting tomorrow

From what I gather, the ones that have the little opening in the back are experiencing the leaks, they moved the opening (still not sure why there is any opening at all) to the front side and supposedly fixed the water intrusion issue. My build date is 08/09/18 and came with the opening on the front. Still going to RTV it to completely seal it up.

[mbowen89]

Pretty sure my third brake light was leaking, you can see water in it. I removed it and could pour some water out.

 

It has a very thin foam seal. It was completely compressed and flat along the top, and dirty, obviously water had been leaking down through the top.

 

I put a bead of RTV over foam and I hope that fixes it permanently.

[BUDMANZ71]

That is exactly what I would expect to see when the third break light was leaking.   This has to be my sunroof.  Thanks for the reply and pictures