Service Bulletin

Bulletin No.:

23-NA-087

Date:

May, 2023

TECHNICAL
Subject:

Information on Possible Water Leaks

Brand:

Model:

Cadillac

Escalade Models

Chevrolet

Suburban
Tahoe Models

GMC

Yukon Models

Involved Region or Country

Model Year:
from

to

2021

2023

VIN:
from

Engine:

Transmission:

All

All

to

North America and Middle East

Service Procedure

Drain Hose Kinked Causing Water Leak

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.
This bulletin is to be used as a guide of possible water
leaks that may occur. Please use the appropriate
Service Procedure listed below for the Condition found.

6341782

Copyright 2023 General Motors LLC. All Rights Reserved.

Page 2

May, 2023

Bulletin No.: 23-NA-087

Condition

Some customers may comment on water running down the headliner between “B” and
“C” pillars while traveling in the rain.

Cause

The cause of this condition may be due to L/R sunroof drain hose is kinked near
connection to wheel well.
Note: Sometimes may drain normally unless heavy amounts of rain is present.

Correction

Replace Left or Right sunroof drain.

Service Procedure
If you encounter a vehicle with the above concern,
replace the left or right sunroof drain. Refer to the
proper replacement procedure within Si.

Rear Wheel Well Drain Blocked by
Insulation

6341786

6341785

6341789

Condition

Some customers may comment on a severe water leak into the vehicle.

Cause

This condition may be due to the rear drain’s being blocked by insulation and not allowing
water to flow into the rear wheelhouse liner as intended.

Correction

Remove the white insulation in rear liners to allow drains to drain as intended.

Bulletin No.: 23-NA-087

May, 2023

Page 3

Service Procedure
If you encounter a vehicle with the above concern,
complete the following:
1. Lower the rear wheelhouse liner and visually
inspect to see if the white insulation is blocking the
end of the drain, as shown above

6341791

2. If the white insulation is blocking the end of the
drain, remove some of the white insulation so
water can drain properly from the sunroof rear
drain hose.
3. Once drain hose is clear of any obstructions verify
condition is corrected.

Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
Labor Operation

Description

Labor Time

6086048*

Remove Insulation in Wheelhouse Liner for Drain

0.4 hr

*This is a unique Labor Operation for Bulletin use only.

Page 4

May, 2023

Bulletin No.: 23-NA-087

Electrical and Transmission Control
Water Leak

Condition

Some customers may comment on one or more of the following:
• Cannot shift out of park
• Electrical smell
• Malfunction Indicator Lamp Illuminated
A technician may find one or more of the following:
• No communication with the Transmission Control Module or Gear Shift Control
Module
Some technicians may find one or more of the following DTC’s:
• U0101 - Lost Communication with Engine Control Module.
• U0103 - Lost Communication with Gear Shift Control Module
• P3051 - 12 V Starting and Charging
• P3056 - 12 V Starting and Charging

Cause

This may be due to water leaking from the right front sunroof drain onto T19 Malfunction
Power Supply Converter.

Correction

Following the steps in the Service Procedure from Bulletin 20-NA-219, add drain hose
extensions to both the right and left sides.

Floorboard Water Leak
Condition

Some customers may comment on a water leak into the drivers or passenger
floorboard area.

Cause

The cause of this condition may be the front sunroof drain(s) not being fully seated into
designated hole in vehicle.

Correction

Fully seat drain tube and ensure there is no damage to tube.

Service Procedure
If you encounter a vehicle with the above concern,
complete the following:
1. Verify sunroof drain is fully seated as intended.
Refer to Sunroof Drain Inspection and Cleaning
in Si.

Overhead Console Water Leak
Condition

Some customers may comment on a water leak originating from the overhead console.

Cause

Water test vehicle confirmed leak from overhead console area. Remove overhead
console and drop front of headliner. Found leak coming from spot weld at windshield
seam. Had windshield removed, found two holes in spot welds on windshield frame.
Looks to be burned through on vehicle assembly.
This may be due to holes in spot welds on windshield frame and body flange.

Correction

Apply seam sealer to holes by following the procedure below.

Bulletin No.: 23-NA-087

May, 2023

Service Procedure
If you encounter a vehicle with the above concern,
complete the following:
1. Drop the front of the headliner, refer to Headlining
Front Trim Panel Replacement in Si.

Page 5

2. Visually inspect the windshield frame and body
flange for leaks.
Note: It may be necessary to remove windshield, if
windshield is found to need to be removed refer to
Windshield Replacement in Si.
3. Once a leak is verified, apply M Ultrapro Autobody
Clear Sealant - 08302, or Wurth Euroseal Gel
Clear 18920104, or equivalent to locations of leak.
4. Verify condition is corrected and reinstall headliner.
Refer to Headlining Front Trim Panel Replacement
in Si.

Part Information
To obtain information for your local retail location,
please call 3M at 1-888-364-3577.
Contact Wurth though website www.wurthusa.com, by
e-mail at [email protected], or by
calling 1-800-987-8487.
In Canada, contact Wurth though their website at
www.wurth.ca/, by e-mail at [email protected], by calling
1-800-263-5002, or your local Wurth representative.
Causal
Part

Description

Part
Number

N/A

*3M Ultrapro
Autobody Clear
Sealant

08302

*Wurth Euroseal
Gel Clear (5 oz/
148 ml)

18920104
(892.0104 in
Canada)

6341784

Material
Allowance

$30.00 U.S
($41.00
Canada)

* We believe this source and their products to be reliable.
There may be additional manufacturers of such products/
materials. General Motors does not endorse, indicate any
preference for, or assume any responsibility for the products
or material from this firm or for any such items that may be
available from other sources.

Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.

6341792

Labor Operation

Description

Labor Time

*2086788

Apply Seam Sealer to Windshield Frame

1.0

Add

To Remove Windshield

0.8

*This is a unique Labor Operation for Bulletin use only.

Parts Information

Warranty Information

Parts will defer per cause and correction, refer to the
GM Global EPC (Electronic Parts Catalog) for the
correct part numbers based on the vehicles build
information.

For vehicles repaired under warranty, submit the
appropriate labor operation for the repair performed.

Page 6

May, 2023

Version

1

Modified

Released May 05, 2023

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.

Bulletin No.: 23-NA-087

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