Water leaking under passenger floor

[2016LTCC]

I have been having an issue with water leaking into the cab under the passenger side floor during heavy rains. Does anyone else have this issue? 2017 Silverado cc z71

[JimCost2014]

Multiple threads, and from personal experience, start with the antennae, sun roof, third brake light, window seal, clogged drain pipes, fire wall and so on. The head liner is a great place to look, it shows water stains very clearly, pull the a Pilar on the side with the water intrusion and see if it is wet inside. Or just take it in under warranty and hope they can track it down. 

[MixerDriver]

Maybe check your drain plugs too. I had one that wasn't properly seated behind the seats. Anytime it rained, the vinyl floor lining would be soaked underneath.

[ChevyKev]

I had the same issue with the passenger floor up front being soaked. The dealership ended up finding that a rubber grommet at the firewall was not sealed at all. It was sealed up at that point & has been all good for a couple years now. 

[2016LTCC]

On 4/19/2018 at 11:08 PM, ChevyKev said:

I had the same issue with the passenger floor up front being soaked. The dealership ended up finding that a rubber grommet at the firewall was not sealed at all. It was sealed up at that point & has been all good for a couple years now. 

Thanks for help. I have looked but haven’t seen anything. Do you have a picture or any idea of where the grommet is?

[ChevyKev]

15 hours ago, 2016LTCC said:

Thanks for help. I have looked but haven’t seen anything. Do you have a picture or any idea of where the grommet is?

No problem. If I could find a couple pictures on the computer, I will post them. Good luck.