24-NA-029 Service Bulletin/Repair Instructions

Bulletin No.: 24-NA-029
Service Bulletin
Date: May, 2025
INFORMATION

Subject:
Brand:
GMC
HUMMER EV Water Leak Diagnostic Tips
Model:
Model Year:

from
to
HUMMER EV Pickup
2022
2025
HUMMER EV SUV
2024
2025
VIN:

from
to
-
-
Engine:
Transmission:
All
All
Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws

applicable to the activities it performs under this bulletin, including but not limited to handling, deploying,

preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a

conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you

must follow those applicable laws.

Important: This technical service bulletin (TSB) can only be completed by certified repair facilities who have met all

specific training, tool and equipment requirements pertaining to the vehicle Brand and Model serviced. Repairs must

be performed by a technician who has successfully completed the required training.
General Information

Water leaks can occur due to a variety of reasons. Success to finding the source of the leak starts with duplicating

the leak or acquiring pictures or videos of the leak from the customer.

Step 1 in any water leak diagnosis begins with understanding where the leak is coming from and under what conditions it occurs. How quickly does the leak appear once the rain starts? Does it leak during a light rain or

downpour? Does it happen while going through an automatic car wash with high-speed blowers? Is the leak

constant or intermittent?

Another common cause of a leak is from the use of a high-pressure power washer. The sealing capability of frameless side glass design of the vehicle is easily overcome with the use of a high power-pressure washer being sprayed

directly onto the edges of the side glass where the glass meets the door opening weather strips. Refer to the

Owner’s Manual for additional Exterior Care information.

Knowing the conditions that cause the leak plus an understanding of where the leak appears is key to resolving the

customers concern. The purpose of this bulletin to help guide you through proper diagnosis as well as provide some

actual causes of leaks and what action was taken to repair the leak.
The following information is split into 3 categories.

1. I-Bar Water Leaks

2. Sky Panel Water Leaks

3. Side Window Water Leaks
Copyright 2025 General Motors. All Rights Reserved.
Page 2
May, 2025
Bulletin No.: 24-NA-029
I-Bar Water Leaks

Model Year 2022 only
6541873
This design is from 2022 ONLY. If the open cell foam is discovered, check the vehicle for open field action and

replace the I-Bar per Service Update Bulletin N222378440.
Model Year 2022 — Current
6542034
Condition
Water pours out of the lower I Bar trim cover as it collects in the sump created by the

contour of the trim, especially when turning a corner.
Easiest way to diagnose this complaint is to remove the lower trim panel, water test, and watch for the leak.
Bulletin No.: 24-NA-029
May, 2025
Page 3
6542118
With trim panel removed, if water is leaking through the I-Bar as shown, replace the I bar.
6542125
The front I Bar is designed to be removed by the customer. If the front I bar is installed backward it will leak. When

removing the I Bar, inspect the orientation of the I Bar to ensure the “front” is in fact pointing towards the front of the

vehicle. Inform the customer on proper installation if this condition is found.
Page 4
May, 2025
Bulletin No.: 24-NA-029
6542146
Water leaking near the front or rear of the I Bar in this zone is usually not caused by the I Bar. Water droplets

coming past the weather strip and roof headliner panel are due to excessive water building up in the drain system. If

any sky panel is out of alignment, excessive water can get past the sealing surfaces and allow too much water to

enter into the drain system, thus allowing water to exist in unwanted locations. Inspect the sky panels for proper

alignment and adjust as necessary. Refer to SI DOC ID 6339878 (pickup) or 6341146 (SUV).
6542173
Another possible cause of water droplets in this area can be caused by creased I Bar weather strips.
Bulletin No.: 24-NA-029
May, 2025
Page 5
6542199
Cause
Folded over weather strips on the I-Bar due to improper sky panel installation. Pay close

attention to these areas when first removing the sky panel. If the outboard weather strip

ends are folded over this will cause the sky panel to raise up preventing a good seal. If

the crease is permanently set as shown below, this will also prevent the weather strip

laying flat even with the sky panel installed pushing the sky panel upwards causing a gap

and leak.
Correction
Replace the I-Bar – educate customer on proper sky panel installation.
The recessed areas where the I Bar mounts to the roof are part of the water management system and designed to

be wet.
6543780
It is normal to have presence of water as shown.
Page 6
May, 2025
Bulletin No.: 24-NA-029
Proper Sky Panel Installation per Owners Manual
6542230
Carefully place the roof panel into its designated location. Position the inboard edge of the roof panel next to the

weatherstrip on the I-Bar, then align and fit the horizontal pins into the receivers on the I-Bar.

When aligning the pins and receivers, make sure the inboard edge of the roof panel does not come in contact with

the roof seals. Ensure that the inboard edge is far enough in that it clears the I-Bar weatherstrip. Ensure that the IBar weatherstrip is lying flush with the adjacent roof seals before fully engaging the pins into the receivers. Failure to

do so may damage the weatherstrip or lead to an improper seal.
Sky Panel Water Leaks

Condition
Leaks near the top of any of the side windows, weather strips, or sky panel weather strip.
Cause
If any sky panel is out of alignment such as being shifted too far forward or rearward, or

too high, this will causing excessive water to enter into the water management system in

the weather strips. This causes water to back up over the sealing surfaces creating a

leak inside the cabin near the corners of weather strips near the weather strip drain

holes.
Correction
Perform top down, side to side, visual inspection of all 4 sky panels installed, with the Ibar installed. If any sky panel appears to be not square in the opening or sitting high –

verify the dimensions and adjust as necessary following SI DOC ID 6339878 (pickup) or

6341146 (SUV)
Bulletin No.: 24-NA-029
May, 2025
Page 7
6908309
Example of a sky panel weatherstripping flap up that would allow water to intrude. This is something that can be

overlooked if the top is removed and the customer or dealer doesn’t pay attention when reinstalling the removable

top.
6908313
Example of the correct way the roof flap should be tucked in to prevent water intrusion.
Page 8
May, 2025
Bulletin No.: 24-NA-029
6542288
Verify the dimensions and adjust as necessary following SI DOC ID 6339878 (pickup), 6341146 (SUV).
6542318
Bulletin No.: 24-NA-029
May, 2025
Page 9
6542346
Condition
Water dripping into the cabin from between the sky panel and its seal (front corner of the

LR panel pictured), especially when stopping.
Cause/Correction
This was due to the left rear sky panel being too far rearward allowing poor seal along the

front edge of the left rear sky panel to weather strip. Essentially overwhelming the water

drain management system. To adjust the sky panel, refer to SI DOC ID 6339878 (pickup)

or 6341146 (SUV).
6542375
Page 10
May, 2025
Bulletin No.: 24-NA-029
6542378
Condition
Water drains into the cabin from between the sky panel and its seal (front corner of the

RF panel pictured).
Cause/Correction
Adjusting the sky panel strikers down resolved the leak. To adjust the sky panel strikers,

refer to SI DOC ID 6339878 (pickup) or 6341146 (SUV).
6542379
Condition
Water leaking past the top of the window, and onto the door trim panel.
Cause
Sky panel weather strip was not properly seated to the metal u-channel. The weather

strip will have an uneven appearance on the end. Further inspection should reveal the

weather strip is not properly seated onto and under the metal u-channel. Water will leak

at the overlap joint between the sky panel weather strip and roof bow weather strip.
Correction
Inspect the sky panel weather strip to ensure it’s properly seated onto the metal uchannel retainer. If necessary, pull the weather strip up and away, then gently re-seat

the weather strip over the u-channel. Verify the weather strip lays flat on the ends.
Bulletin No.: 24-NA-029
May, 2025
Page 11
Side Window Water Leaks
6542380
Condition
Water leaks between the side windows and weather strips.
Cause
Side glass is out of position, including being too low or tilted at an angle, the glass will not

seal properly to the door opening weather strips or the top weather strip on the sky panel.
Correction
Inspect the side door glass ensuring it’s square in the body opening and covering the

weather strip evenly on both sides. Compare the height and orientation from side to

side. Adjustments are made by loosening the window regulator to door glass clamps.

Refer to applicable SI procedure for regulator replacement for proper steps to access

these attachment points.

Note: Side Glass out of adjustment can also cause wind noise.
6542381
Page 12
May, 2025
Bulletin No.: 24-NA-029
Condition
Water leaks between the side windows and weather strips.
Cause
Side glass out of position, including being tilted outboards causing a lack of pressure

between the side glass and the weather strip.
Correction
Inspect the side door glass ensuring that it’s compressing onto the door opening weather

strips. Tilting the glass inwards will help push the glass onto the door opening weather

strips making a tighter seal. Adjustments are made by loosing the window regulator to

door bottom mounting bolt and tilting the entire window and regulator asm as needed.

Refer to applicable SI procedure for regulator replacement for proper steps to access

these attachment points.
6542383
Condition
Water leaks between the side windows and weather strips
Cause
Plugged drain(s)
Correction
Inspect the drain hole closest to the location where the leak is occurring. Look for any

rubber flashing that might be partially covering the drain hole(s). Remove debris or rubber

flashing as required.

Tip: With the top removed, close the door, fully raise the window check the drain hole to

ensure it’s not being pinched closed when the side window is all the way up.
Bulletin No.: 24-NA-029
May, 2025
Page 13
6542384
Condition
Water leaks between the side windows and weather strips
Cause
Plugged drain(s)
Correction
Inspect the drain hole closest to the location where the leak is occurring. Look for any

debris or rubber flashing that might be partially covering the drain hole(s). Remove

flashing if required.

Tip: With the top removed, close the door, fully raise the window check the drain hole to

ensure it’s not being pinched closed when the side window is all the way up.
Version
3
Modified
Released February 08, 2024

Revised July 11, 2024 – Added 2025 Model Year.

Revised May 02, 2025 – Updated Sky Panel Water Leaks section.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these

technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper

service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job

properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your

vehicle will have that condition. See your GM dealer for information on whether your vehicle may beneﬁt from the

information.
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