Service Bulletin

Bulletin No.:

23-NA-124

Date:

July, 2023

TECHNICAL
Subject:

Dead Battery Resulting from Communication Gateway Module Activity

Brand:

Model:

Cadillac

LYRIQ

Model Year:

VIN:

from

to

from

to

2023

2023

—

—

Involved Region or Country

North America

Additional Options (RPOs)

Equipped with RPO BEV

Engine:

Transmission:

—

—

Some customers may comment on a dead 12V battery, no start, or passive key fob
functions not functioning and a parasitic draw may be observed.
Note: The 12V battery and High Voltage systems will often remain active for a period of
time after vehicle shutdown. Refer to the diagnostic aid below to verify if there is a
parasitic draw on the battery.

Condition

Vehicle OFF 12V Battery Support
The high voltage contactors may remain closed with the Vehicle Power Mode State OFF
to support the 12V battery and electrical loads. Opening the high voltage service lockout
(HVSL) and forcing the high voltage contactors open when they are closed and under
load is not recommended.
• Pre-sleep occurs every time the Vehicle Power Mode State is transition to the Power
Mode OFF State a 10-minute timer starts, the high voltage contactors will remain
closed supporting the 12V battery and any other electrical loads until the 10 minutes
have elapsed.
• Vehicle Power Mode State is OFF, Enhanced Battery Support Mode (EBSM)
monitoring occurs once every 11 hours or sooner if the BCM is woke up by any internal
or external input signal. EBSM will observe the 12V battery state of charge (SOC) and
if the SOC is too low the high voltage contactors will be requested closed. Once 12V
battery support has begun, the EBSM mode has a 2-hour timer followed with
15-minute rest period. The battery charging may continuously function between 2
hours/15-minute rest period provided the 12V battery SOC remains too low and the
BCM does not return to its sleep state. EBSM monitoring could be terminated before
the 2-hour time limit, provided the desired 12V battery SOC value is met.
You can determine if the high voltage contactors are closed and under load while Vehicle
Power Mode State is OFF by measuring the voltage at the 12V battery.

Cause

The cause of the condition may be a software anomaly that may result in the Serial Data
Gateway Module causing a draw, resulting in a discharged or dead 12V battery.

Correction

Cycle the F25DA fuse and then confirm the Serial Data Gateway Module has the latest
available software. Reprogram the module if the software is not the latest released. After
programming, confirm that there is no longer a draw on the battery.

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.
Copyright 2023 General Motors LLC. All Rights Reserved.

Important: This technical service bulletin (TSB) can
only be completed by certified repair facilities who
have met all specific training, tool and equipment
requirements pertaining to the vehicle Brand and
Model serviced. Repairs must be performed by a
technician who has successfully completed the
required training.

Page 2

July, 2023

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 12V 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.

•

•

•

•

Bulletin No.: 23-NA-124
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.: 23-NA-124

July, 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

July, 2023

Bulletin No.: 23-NA-124

5644477

Important: Techline Connect screen 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. Document the WCC on the job card.
No further action is required. Refer to the Warranty
Information section of this bulletin.
1. Reprogram the Serial Data Gateway Module. Refer
to K56 Serial Data Gateway Module: Programming
and Setup in the Service Manual.

Bulletin No.: 23-NA-124

July, 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 the SPS Warranty Claim Code on the job
card for warranty transaction submission.

Page 6

July, 2023

Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation

5430130

Description

Labor Time

Fuse Replacement

Use
Published
Labor
Operation
Time

Use
Published
Serial Data Gateway Module
Labor
2810275*
Reprogramming with SPS
Operation
Time
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.: 23-NA-124

Bulletin No.: 23-NA-124

July, 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.
Version

1

Modified

Released July 12, 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.

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