NHTSA ID Number: 10191204
Manufacturer Communication Number: 20NA121
TSB/Document Date: 2021-05-03
Summary
This service bulletin provides a procedure to locate and fix a possible leak in the roof area due to missing sealant to correct customer concerns of Various Electrical Issues, No Start, Stall, Brake Lamp Not Off, Radio Inoperative, Remote Key Inoperative, Malfunction Indicator Lamp (MIL) Illuminated.
Bulletin No.:
Service Bulletin
Date:
20-NA-121
March, 2021
TECHNICAL
Subject:
Water Leak at Roof Area, Various Electrical Issues, No Start, Stall, Brake Lamp Not Off,
Radio Inoperative, Remote Key Inoperative, Malfunction Indicator Lamp (MIL)
Illuminated
Brand:
Model:
Encore GX
Trailblazer
(VIN M)
Model Year:
VIN:
from
to
2020
2021
2021
2021
from
to
—
—
All
All
All
All
Involved Region or Country
North America
Condition
Some customers may comment on a water leak in the front and/or rear of the vehicle
(water found under A-pillar and B-pillar trim or in the spare tire area).
Cause
5703536
Copyright 2021 General Motors
LLC. All Rights Reserved.
Page 2
March, 2021
Bulletin No.: 20-NA-121
5703537
5703539
Bulletin No.: 20-NA-121
March, 2021
Page 3
5613596
The cause of the condition may be a pin hole in the roof body seam welding/sealing.
Correction
5615611
Inspect for a leak and repair as necessary.
Page 4
March, 2021
Service Procedure
Bulletin No.: 20-NA-121
Inspect and Clean Body-IP Inline
Connectors and Seat Belt Retractor
Pretensioners
5703542
5752326
5613597
Inspect and repair water leak as necessary.
If you encounter a vehicle with the above condition, you
must also include an inspection of the connectors in the
water path. Inspect both the A and B-pillar interior trim
and in-line connectors under the instrument panel (IP)
for signs of a water leak at front roof and the rear cargo
interior trim, headliner, and spare tire area for signs of a
water leak at rear roof.
Once the water leak is found, repair any damage that
may have been done due to the water leak.
Once the damage is repaired, apply seam sealer along
the roof to body seam to correct the condition.
5703541
(#8) — X204 Instrument Panel Harness to Body
Harness, 76-way connector right side
(#6) — X202 Instrument Panel Harness to Body
Harness, 2-way connector left side
(#7) — X200 Instrument Panel Harness to Body
Harness, 76-way connector left side
Bulletin No.: 20-NA-121
March, 2021
Page 5
Parts Information
Causal
Part
Des
cription
Part
Number
NYOGEL
760G
(electrical
grease)
N/A
760G
Qty
1
Contact
Information
TAI
Lubricants,
Inc.
PO Box 1579
Hockessin,
DE 19707
Tel: 1-302326-0200
Fax: 1-302326-0400
sales@TAILubricants
.com or visit
www.tailubricants
.com
5752327
(#11) — F112D Seat Belt Retractor Pretensioner
- Driver
(#4) — F112P Seat Belt Retractor Pretensioner
– Passenger (not shown)
Clean the water inside of the connector and apply
NYOGEL on terminals for waterproofing.
1. With vehicle off, disconnect the battery.
2. To access the connectors, remove the left and right
garnish trim.
Refer to Front Side Door Sill Garnish Molding
Replacement and Center Pillar Lower Trim Panel
Replacement in SI.
3. Inspect the connectors for any moisture. If needed,
clean using a clean nylon bristle brush and dry
connector using compressed air.
4. Preparing NYOGEL 760G (electrical grease) and
flatting tool, apply on IP harness inline connector
surface. Make sure all terminal pins are covered
enough by grease.
5. Reattach the connectors. Make sure the 2nd
locking tab is closed.
6. Reinstall the garnish trim.
Refer to Front Side Door Sill Garnish Molding
Replacement and Center Pillar Lower Trim Panel
Replacement in SI.
Causal
Part
Description
Part
Number
Qty
N/A
Kent® High-Tech
Seam Sealer
Clear
P10200
1
18920104
(892.0104 in
Canada)
1
Or
N/A
Wurth Euroseal
Gel Clear
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
1481498*
Inspect/Clean Body-IP Inline
Connectors, Seat Belt
Retractor Pretensioners and
Body Joint Resealing
1.2 hrs
*This is a unique Labor Operation for bulletin use only. For
consequential damage, use the labor operation associated
with this bulletin. All parts and labor associated should be
claimed on the same transaction, using OLH as necessary
to cover the labor for repair/replacement of the
subsequently damaged part(s). Refer to Service Bulletin 18NA-146 for additional information.
Page 6
March, 2021
Bulletin No.: 20-NA-121
Version
3
Modified
Released June 03, 2020
January 20, 2021 – Added the 2021 Model Year to Encore GX and updated information to
inspect the entire roof, not just the rear.
March 05, 2021 – Added the Inspect and Clean Body-IP Inline Connectors and Seat Belt
Retractor Pretensioners section and updated the Parts and Warranty Information.
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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION
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TSB/Document ID: 20NA121
Replacement Service Bulletin Number:
MFR Communication Date: 2021-03-05
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE
MFR Component System:
MFR Component Subsystem:
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