Bulletin No.: 24-NA-128

Service Bulletin

Date: July, 2024

INFORMATION
Subject:

Powertrain Control Module Fails Key Provisioning/Serial Data
Authentication Configuration and Sets DTC U1962
This Service Bulletin replaces PIT6169B. Please discard PIT6169B.

Brand:

Model:

Model Year:
from

to

Chevrolet

Traverse

2024

2024

GMC

Acadia

2024

2024

Involved Region or Country

Build Date:
from

to

SOP

June 12,
2024

Engine:

Transmission:

LK0

North America

Additional Options (RPOs)
Condition

Some technicians may comment that during any module programming event that is followed by SDAC (Serial Data Authentication Configuration), the K45 PCM (Powertrain
Control Module) has the potential to fail SDAC and DTC U1962 will set.

Cause

The cause of the condition may be a software bug in the K45 PCM.

Correction

Important: Before programming any modules on the vehicle, ensure the K45 PCM software is up to date. The only way to prevent this condition on vehicles built from SOP to
June 12, 2024 is to ensure the K45 PCM software is up to date prior to ANY other programming. Follow the service procedure in this bulletin for updating the K45 PCM software.
It is possible when bringing the K45 PCM up to date on the software level that it may
experience the condition. If it does, K45 PCM replacement will be required.
Important: Ensure you save the SPS Log from the failed K45 PCM programming
event for the part restriction.
Locate your sps2.log:
C:/ > Users > (User ID) > sps > spsDebug > spslog.txt

Copyright 2024 General Motors. All Rights Reserved.

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July, 2024

Bulletin No.: 24-NA-128

6704983

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

Bulletin No.: 24-NA-128

July, 2024

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5743643

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

5877000

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July, 2024

Bulletin No.: 24-NA-128

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 Powertrain Control module. Refer
to K45 Powertrain Control Module: Programming
and Setup in SI.

Bulletin No.: 24-NA-128

July, 2024

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.

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

*2887798

PCM Reprogramming for SDAC Limit

0.4 hr

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

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Labor Operation

July, 2024
Description

Bulletin No.: 24-NA-128
Labor Time

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.

Warranty Claim Code Information Retrieval

6125774

Bulletin No.: 24-NA-128

July, 2024

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.

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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.

3. Select Settings (1).
Version

2

Modified

Released July 11, 2024
Revised July 30, 2024 - Added Chevrolet Traverse engine RPO, revised Condition and
Correction sections.

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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