Bulletin No.:

Service Bulletin

Date:

18-NA-383
February, 2019

TECHNICAL
Subject:

Water Found in Rear Interior of Cab, Water Leak at Rear Sliding Window

Brand:

Model:

Chevrolet

Silverado
1500 (New
Model)

GMC

Sierra 1500
(New Model)

Model Year:

VIN:

from

to

2019

2019

from

Engine:

Transmission:

All

All

to

Involved Region or Country

North America, N.A. Export Regions

Additional Options (RPOs)

WINDOW RR-FULL WIDTH, SLIDING, POWER (A48)

Condition

Customer may comment on finding water in the rear interior of the cab.

Cause

5203798

Copyright 2019 General Motors LLC. All Rights Reserved.

Page 2

February, 2019

Bulletin No.: 18-NA-383

5201854

5201855

Note: The cracks can be in the left and/or right side of the rear sliding window plastic
upper rail glass guide which is covered by the roof rear spoiler. Examples of a left (1),
then right side (2) visual crack (with the spoiler removed) are shown in the graphics
above.
The cause of the condition may be cracking in the rear sliding window plastic upper rail
glass guide. The plastic upper rail glass guide may develop small fractures/cracking
which allows water to pass through on the glass side of the urethane that attaches to the
vehicle body.
Important: When verifying this condition, ensure that the water leak path is due to
cracks in the rear sliding window plastic upper rail glass guide, and NOT a leak in
the primary urethane seal, between the window and the body.
Correction

A leak in the primary urethane seal should be addressed by removing and
resealing the window, using the standard service procedure from SI.
R & R the roof rear spoiler and apply seam sealer to the rear sliding window top
encapsulate, following the steps in the Service Procedure below.

Bulletin No.: 18-NA-383

February, 2019

Page 3

Service Procedure

5201856

1. Lower the rear portion of the headliner (1) and
remove the roof rear spoiler (2). Refer to Roof Rear
Spoiler Replacement, in SI.

5201858

5201857

2. Clean and inspect the full length of the cavity
above the body to window urethane:

2.1. First using shop cloths and glass cleaner, or
suitable equivalent, clean all grime, debris
and water from the cavity.

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February, 2019

Bulletin No.: 18-NA-383

5201859

2.2. Then, using compressed air, blow away any
excess moisture and allow the area to dry
thoroughly.

5201860

Important: Cut the applicator tip to a larger opening
and use care to avoid getting the sealer on the upper/
visible surfaces of the glass.
3. Apply a generous bead of Kent® High-Tech Seam
Sealer Clear P10200, or equivalent, across the
complete length of the urethane/encapsulate.
Allow the sealer to flow to a uniform thickness
across the complete top of the window.

Bulletin No.: 18-NA-383

February, 2019

Page 5

Parts Information
Causal
Part
N/A

Description

Part Number

Kent® HighTech Seam
Sealer
Clear*

P10200

Material
Allowance
$12.25 (U.S.)
$18.39
(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

5201861

Note: The graphic above is a top view of the sliding
window, while standing in the bed of the truck.

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.

4. Allow a short time for the sealer to develop a skim
coat, then reinstall the spoiler and headliner. Refer
to Roof Rear Spoiler Replacement, in SI.
5. Allow at least 24 hours before running the truck
through any car wash.
Labor Operation

Description

Labor Time

2081088*

R & R Roof Rear Spoiler, Apply Seam Sealer to Rear Sliding
Window

1.5 hr

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

Version

2

Modified

Released January 03, 2019
Revised February 01, 2019 – Added Important to Correction to Verify Failure.

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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