Sponsored

Leaking in the bed …..

CyberGus

Well-known member
First Name
Gus
Joined
May 22, 2021
Threads
91
Messages
10,248
Reaction score
33,928
Location
Austin, TX
Vehicles
1981 DeLorean, 2024 Cybertruck
Occupation
IT Specialist
Country flag
The weather sealing over the top missing slat technique did NOT work.
The leak is not between the appliqué and the tonneau, it is between the appliqué and the roof glass.

Open the tonneau, and pour a little water on the roof. It should go around or over the appliqué, but when improperly sealed it will squeeze underneath.

There can also be intrusion at the tonneau gap, but the rain should just go over it unless it’s very misaligned and/or you’re missing a slat.
Sponsored

 

Cybermo

Well-known member
First Name
Mo
Joined
Jan 11, 2025
Threads
4
Messages
113
Reaction score
187
Location
Malibu
Vehicles
Cybertruck AWD, Range Rover Classic
Occupation
Director
Country flag
Update: Went to Thousand Oaks service center again to fix the leaking and get the missing slat installed (2 visits, 4 hours of driving + 7 days total in the shop for this issue), after going back and forth with multiple people via chat before the service and even showing the service advisor where the issue was at the applique seal, I received my car back. Unfortunately they did not address the applique seal like I had requested multiple times even though they told me they did a "hose test" and "only a couple of drops got in". On the plus side - the slat install seems to have mitigated water ingress by about 30%. See photos.
I've also linked to gopro videos of my car going through the wash before and after slat install.
Pre Slat install:
Tesla Cybertruck Leaking in the bed ….. cyberleak-pre-slat

Post Slat:
Tesla Cybertruck Leaking in the bed ….. Screenshot 2025-08-30 at 10.12.18 AM



Pre slat install
https://www.dropbox.com/scl/fi/uhz1...ey=nq4l12mzizltgr2j5mpjsx80j&st=nvfybwbx&dl=0

Post Slat Install
https://www.dropbox.com/scl/fi/lwjo...ey=fdzdy8nvwg97i654onerqkmr3&st=au4vvlqo&dl=0
 
Last edited:

HaulingAss

Well-known member
Joined
Oct 3, 2020
Threads
28
Messages
10,336
Reaction score
20,763
Location
Western Washington, USA
Vehicles
Cybertruck DM, 2010 F-150, 2018 Performance Model 3, 2024 Performance Model 3
Country flag
The vault is semi-dry at best.
You have to put stuff in plastic totes in the back if you want it to stay dry, which is crazy.
That hasn't been my experience. I put duffle bags, soft luggage, and cardboard boxes in the bed and they can sit there through rainy trips and days parked in the rain and remain bone dry. I live in a very wet climate and my truck is never garaged. A couple of times I've even washed the truck with the bed full of stuff, using a bucket of soapy water and hose w/sprayer and everything still stayed dry. That's more than I can say with my F-150 with a BakFlip tonneau cover.

At most, I get a trickle of water running down the inside left and right edges of the tailgate but it doesn't run down the bed, even if parked facing downhill, it flows right out of the tailgate crack at the floor of the bed (regardless of parking attitude).
 
Last edited:

HaulingAss

Well-known member
Joined
Oct 3, 2020
Threads
28
Messages
10,336
Reaction score
20,763
Location
Western Washington, USA
Vehicles
Cybertruck DM, 2010 F-150, 2018 Performance Model 3, 2024 Performance Model 3
Country flag
Update: Went to Thousand Oaks service center again to fix the leaking and get the missing slat installed (2 visits, 4 hours of driving + 7 days total in the shop for this issue), after going back and forth with multiple people via chat before the service and even showing the service advisor where the issue was at the applique seal, I received my car back. Unfortunately they did not address the applique seal like I had requested multiple times even though they told me they did a "hose test" and "only a couple of drops got in". On the plus side - the slat install seems to have mitigated water ingress by about 30%. See photos.
I've also linked to gopro videos of my car going through the wash before and after slat install.
Pre Slat install:
cyberleak-pre-slat.jpg

Post Slat:
Screenshot 2025-08-30 at 10.12.18 AM.png



Pre slat install
https://www.dropbox.com/scl/fi/uhz1...ey=nq4l12mzizltgr2j5mpjsx80j&st=nvfybwbx&dl=0

Post Slat Install
https://www.dropbox.com/scl/fi/lwjo...ey=fdzdy8nvwg97i654onerqkmr3&st=au4vvlqo&dl=0

Mine leaked when new. This is what I did:

See that 5" wide aluminum trim piece at the rear of the roof glass?

Pop it off, it's easy (instructions in the Service Manual), and look for gaps in the foam strip that runs underneath it. Plug them with some self-adhesive foam weather-stripping. Put aluminum trim strip back on. Done. No more leaks.

It took me 20 minutes. I didn't even need any weather-stripping, I just plucked off a little chunk on either end where there was excess and re-stuck it back into the two gaps I found. Over a year later, no more leaks.
 

Cybermo

Well-known member
First Name
Mo
Joined
Jan 11, 2025
Threads
4
Messages
113
Reaction score
187
Location
Malibu
Vehicles
Cybertruck AWD, Range Rover Classic
Occupation
Director
Country flag
Appreciate that, that was the plan after this last visit. At least I got the missing part installed now I can DIY the rest.
 


Aces-Truck

Well-known member
First Name
Kevin
Joined
Apr 25, 2020
Threads
11
Messages
243
Reaction score
332
Location
Snohomish County, WA
Vehicles
2024 AWD Cybertruck, 2025 MY
Occupation
Mechanical Engineer
Country flag
Interesting thread. Today, going 65-70mph on a freeway, I heard a loud bang; followed shortly after by another, possibly louder bang. Pulled off the freeway and discovered I am missing a slat. I can only assume it came off due to wind forces and fasteners working loose. I'll schedule with my SC to get it replaced. I have just over 5k miles on my truck, over a 10 month period. Here's a picture when I pulled over.

Tesla Cybertruck Leaking in the bed ….. 20250830_174225
 

espresso-drumbeat

Well-known member
First Name
Espresso
Joined
Feb 7, 2024
Threads
20
Messages
150
Reaction score
561
Location
Here
Vehicles
Cybertruck
Interesting thread. Today, going 65-70mph on a freeway, I heard a loud bang; followed shortly after by another, possibly louder bang. Pulled off the freeway and discovered I am missing a slat. I can only assume it came off due to wind forces and fasteners working loose. I'll schedule with my SC to get it replaced. I have just over 5k miles on my truck, over a 10 month period. Here's a picture when I pulled over.

20250830_174225.jpg
I don't think anything like this possible, need more details
 

Sterling Shadow

Well-known member
Joined
Aug 4, 2025
Threads
3
Messages
182
Reaction score
322
Location
San Diego
Vehicles
Cybertruck 25', Model Y 26'
Country flag
That looks exactly how my truck came, it was missing that slat as well. I’m wondering if maybe the noise was something else but you just now noticed the missing slat. Originally I didn’t see it, someone here explained how to look for it.
 

Aces-Truck

Well-known member
First Name
Kevin
Joined
Apr 25, 2020
Threads
11
Messages
243
Reaction score
332
Location
Snohomish County, WA
Vehicles
2024 AWD Cybertruck, 2025 MY
Occupation
Mechanical Engineer
Country flag
When I first heard the noise, I feared it was one of the cantrails. But they were fine. Is it possible it was always missing? Not likely. I never had any leaking problems. I have not tried to hose it down since this happened. I just happened 3 hours ago. I test it with water and post my results. If correct, there could be a scenario where the slat was on when delivered, than came off.
 


cyberHoward

Well-known member
Joined
Nov 29, 2019
Threads
18
Messages
284
Reaction score
213
Location
Northern Ohio
Vehicles
Cybertruck AWD Foundation
Country flag
Since the last fix by the service center in Mayfield, Ohio (my fourth visit on this), I don't get ANY water on my back window or against the wall below the window even with a High Pressure Car Wash. It is bone dry except for some drops of water about a 18" off the back wall and it is super minor so I have not investigated it, but I wonder if there are loose slats or why I would get a leak that appears to be between slats 18 inches from the back. Again, I am pleased with the now mostly waterproof bed, but If I can figure this out it will be 100% water tight. It took a total replacement with a new Applique and some new seal they said was right by the roof glass. I had water coming down my back window through 3 other visits. I think it was the new Applique myself.
 

Cybermo

Well-known member
First Name
Mo
Joined
Jan 11, 2025
Threads
4
Messages
113
Reaction score
187
Location
Malibu
Vehicles
Cybertruck AWD, Range Rover Classic
Occupation
Director
Country flag
Nice, Howard! Congrats.
Update on my situation as well - it took two visits - slat install, post install leaking continued, then emphasizing the applique seal in between glass and tonneau being the major culprit (with video I shot in the bed while going through car wash), and they finally fixed the foam stripping in the applique. Now it is bone dry in the back!
 
 








Top