Bulletin No.:

Service Bulletin

Date:

21-NA-142
February, 2023

TECHNICAL
Subject:

Front Brake Grind/Groan Noise After Sitting Overnight
This bulletin replaces PIT5805B. Please discard PIT5805B.

Brand:

Model:

Buick

Enclave

Cadillac
Chevrolet
GMC

Model Year:
from

to

to

2020

5GAERBKW8LJ296460

5GAERBKW3PJ183456

SOP

1GYKNAR42PZ158345

2021

SOP

1GYKPCRS1PZ157966

XT5
XT6

VIN and DATE Breakpoints:
from

Blazer

2023

Traverse

2020

1GNERKKW5LJ296020

1GNERGKW1PJ183457

Acadia

2021

SOP

1GKKNRL49PZ161180

Involved Region or Country

Engine:

Transmission:

All

All

North America, Russia, Middle East, Palestine, Japan, South Korea, Bolivia, Ecuador,
Chile, Colombia, Peru, GM Korea, Uzbekistan.

Additional Options (RPOs)
Condition

Some customers may comment on hearing a brake noise on the first few stops. They may
describe it as a grind/groan sound, and it may feel like ABS is active, but it is not.

Cause

The cause of the condition may be the front disc brake pad material.

Correction

Verify the condition is present and verify the pad number stamp on the top edge of
the pad.
If you see GM9130 or GM9140
For Non-LSY applications ONLY
1. Replace the front disc brake pads with the parts listed below, refer to Front Disc
Brake Pads Replacement in SI
2. Scuff the rotors.
3. Perform the Brake Pad and Rotor Burnishing procedure. Refer to Brake Pad and
Rotor Burnishing in SI. Complete a minimum of 20 stop events.
For LSY equipped Acadia, Blazer and XT6 vehicles ONLY
1. Replace the pads with the Pad Kit part number listed below, refer to Front Disc
Brake Pads Replacement in SI.
2. Scuff the rotors.
3. Reprogram the Electronic Brake Control Module (EBCM).
4. Perform the Brake Pad and Rotor Burnishing procedure. Refer to Brake Pad and
Rotor Burnishing in SI. Complete a minimum of 20 stop events.

Copyright 2023 General Motors LLC. All Rights Reserved.

Page 2

February, 2023

Service Procedure
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.
Caution: Before downloading the update files, be sure
the computer is connected to the internet through a
network cable (hardwired). DO NOT DOWNLOAD or
install the files wirelessly. If there is an interruption
during programming, programming failure or control
module damage may occur.
• Ensure the programming tool is equipped with the
latest software and is securely connected to the
data link connector. If there is an interruption
during programming, programming failure or
control module damage may occur.
• Stable battery voltage is critical during
programming. Any fluctuation, spiking, over
voltage or loss of voltage will interrupt
programming. Install a GM Authorized
Programming Support Tool to maintain system
voltage. Refer to www.gmdesolutions.com for
further information. If not available, connect a fully
charged 12 V jumper or booster pack
disconnected from the AC voltage supply. DO
NOT connect a battery charger.
• Follow the on-screen prompts regarding ignition
power mode, but ensure that anything that drains
excessive power (exterior lights, HVAC blower
motor, etc) is off.
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.

Bulletin No.: 21-NA-142

Important: The service technician always needs to
verify that the VIN displayed in the TLC left side drop
down menu and the top center window match the VIN
plate of the vehicle to be programmed prior to using
Service Programming System 2 (SPS2) for
programming or reprogramming a module.
• For the TLC application, service technicians need
to always ensure that the power mode (ignition) is
“ON” before reading the VIN from the vehicle’s
VIN master module and that they do not select a
VIN that is already in the TLC application memory
from a previous vehicle.
• If the VIN that shows up in the TLC top center
window after correctly reading the VIN from the
vehicle does not match the VIN plate of the
vehicle, manually type in the VIN characters from
the vehicle VIN plate into the TLC top center
window and use these for programming or
reprogramming the subject module with the
correct vehicle VIN and software and/or
calibrations.
• The Engine Control Module (ECM) is the master
module (for VIP vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the ECM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.
• The Body Control Module (BCM) is the master
module (for GEM vehicles) that TLC reads to
determine the VIN of the vehicle. If the VIN read
from the vehicle by TLC does not match the VIN
plate of the vehicle, the BCM also needs to be
reprogrammed with the correct VIN, software and
calibrations that match the vehicle’s VIN plate.

Bulletin No.: 21-NA-142

February, 2023

Page 3

Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.

5743643

Important: If the vehicle VIN DOES NOT match, the
message below will be shown

5877000

Page 4

February, 2023

Bulletin No.: 21-NA-142

5644477

Important: Techline Connect screens shown above.
Important: If the same calibration/software warning is
noted on the TLC Summary screen, select OK and
follow screen instructions. After a successful
programming event, the WCC is located in the Service

Programming System dialogue box of the SPS
Summary screen. No further action is required. Refer to
the Warranty section of the bulletin.
1. Reprogram the Electronic Brake Control Module.
Refer to K17 Electronic Brake Control Module:
Programming and Setup in SI.

Bulletin No.: 21-NA-142

February, 2023

Page 5

5644478

Note: The screenshot above is an example of module
programming and may not be indicative of the specific
module that is being programmed. Module selection
and VIN information have been blacked out.
Important: To avoid warranty transaction rejections,
you MUST record the warranty claim code provided on
the Warranty Claim Code (WCC) screen shown above
on the job card. Refer to callout 1 above for the location
of the WCC on the screen.
2. Record SPS Warranty Claim Code on job card for
warranty transaction submission.

Parts Information
Causal
Part

Description

Part
Number

Qty

X

Pad Kit-Frt
Disc Brk

85619135

1

Page 6

February, 2023

Bulletin No.: 21-NA-142

Warranty Information
Repairs made for the specific concern within this
bulletin will be covered for a period of 24 months or
24,000 miles or 40,000 km, whichever occurs first.
Labor Operation

Description

Base Labor Time

2486308*

Front Disc Brake Pads Replacement and Scuff Both Front
Rotors

Enclave – 1.1 hr
Traverse – 1.1 hr
Blazer – 1.1 hr
Acadia – 1.2 hr
XT5 – 1.1 hr
XT6 – 1.6 hr

Add

Electronic Brake Control Module Reprogramming with SPS for
LSY vehicles

0.3 hr

*This is a unique Labor Operation for Bulletin use only.
Important: **To avoid warranty transaction rejections, carefully read and follow the instructions below:

6125814

•
•

The Warranty Claim Code must be accurately entered in the “Warranty Claim Code” field of the transaction.
When more than one Warranty Claim Code is generated for a programming event, it is required to document all Warranty
Claim Codes in the “Correction” field on the job card. Dealers must also enter one of the codes in the “Warranty Claim Code”
field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by SPS2.

Bulletin No.: 21-NA-142

February, 2023

Page 7

Warranty Claim Code Information Retrieval

6125774

If the Warranty Claim Code was not recorded on the
Job Card, the code can be retrieved in the SPS2
system as follows:
1. Open TLC on the computer used to program the
vehicle.
2. Select and start SPS2.
3. Select Settings (1).
4. Select the Warranty Claim Code tab (2).

The VIN, Warranty Claim Code and Date/Time will be
listed on a roster of recent programming events. If the
code is retrievable, dealers should resubmit the
transaction making sure to include the code in the SPS
Warranty Claim Code field.

Page 8

February, 2023

Bulletin No.: 21-NA-142

Version

10

Modified

Released June 21, 2021
Revised June 30, 2021 – Replaced LTG Labor Operation with Unique Bulletin Labor
Operation
Revised July 13, 2021 – Updated Parts Information with New Replacement Service Part
# 85520396.
Revised January 27, 2022 – Updated Breakpoints
Revised March 09, 2022 – Changed Blazer End Breakpoint from Date to VIN.
Revised April 14, 2022 – Added Note to Cause, Updated Correction, Increased Labor
Time and Replaced Labor Operation Number.
Revised August 23, 2022 – Added 2023 Model Year to All Models Except Colorado and
Canyon.
Revised December 14, 2022 – Updated Note in Cause Section.
Revised January 30, 2023— Removed Colorado and Canyon Models, Updated
Correction, Updated Part Number and Added Ending Breakpoints and changed Labor
Op #.
Revised February 13, 2023 – Added LSY Brake Pad Replacement Procedure to
Correction Section, Reprogramming Procedure under Service Procedure, Updated
Warranty Information with Reprogramming Add Time.

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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