2016 2500HD Denali roof leak

Mike Hamm · April 11, 2017

My truck is at the dealer now it's the second leak on mine...

It'll be interesting to read what they find this time.

cford716 · April 11, 2017

My truck is at the dealer now it's the second leak on mine

When did they fix it the first time? How long ago?

Garybee1508 · April 11, 2017

When did they fix it the first time? How long ago?

2 weeks ago lol

Garybee1508 · April 11, 2017

It'll be interesting to read what they find this time.

will keep you posted when I pick it up.

cford716 · April 11, 2017

2 weeks ago lol

Well that blew my idea of maybe it had been awhile and it was still the older design.

Garybee1508 · April 11, 2017

Well that blew my idea of maybe it had been awhile and it was still the older design.

its a 16 sierra Denali only 14,000 mile and it puzzling that It did it twice

Garybee1508 · April 12, 2017

So the update is that the sunroof drain came loose I guess when they were putting the headliner back together

Mike Hamm · January 18, 2018

I haven't been on here in awhile but wanted to come back and say, yup, the sharkfin leaked AGAIN! Supposedly got it "fixed" again yesterday. We'll see since we had a pretty good rain overnight last night.

Supposedly there is a "new" fix that involves a different torque spec on the nut and applying seam sealant...somewhere. I don't know if any of this is for a service bulletin, but here is what is on my invoice - " Cause corrected. 3480548 RD 1.3 Doc ID#4828810". Covered under warranty so that part's good.

Fingers crossed.

David12 · February 16, 2018

I’m going through a water leak issue right now on my brand new 2018. Very frustrating. It’s currently at the dealership for the second time now. The first time they claim the third tail light and they also found a body seam to be leaking as well.

xps800doo · February 19, 2018

was putting in new floor mats on my new to me (3 weeks old) 15 sierra with 60,000 and sure as shit the entire floor front back and both sides is quite wet! i do not see any water stains on the headliner, i do NOT have a sun roof, the cab vents are not missing, i did notice the driver side a little wet when i took delivery but they said its must be from them shampooing the carpets for delivery detail.... the dealer is out of state about 6 hours drive. this truck is not a daily driver it has been sitting for 2 weeks!! where did this water come from!!! so disgusted!!!! the money you pay for these trucks and the shit you get for a product. shout be illegal!!

nono50 · November 7, 2018

I just had the TSB done to mine. They replaced the onstar Antennae and add sealant. The new Onstar Antenna seal is redesigned I see it now has the water drain towards the windshield instead towards the back of the truck. It was TSB 17-NA-214 and it covers up to 2018 dated FEB 14 2018. This bulletin is for the GMC Sierra trucks and suspect there is one for Chevy also. I believe only different is that the GMC antennae are body color where the Chevy's are black.

Scott

2016 GMC Sierra Denali 2500HD

EXSlider400 · November 9, 2018

Happened to me too they tightened up the single bolt that holds it down but it seems to be a little loose now because I can turn the antenna when I’m washing the truck but it’s not leaking. But at least it’s on the record that It was already repaired once. This is a common issue with these trucks and don’t understand why they can’t get this fixed before they roll off the line. So I’m going to try to have them replace it with the TSB..Any pictures of the new design?