Bulletin No.:

Service Bulletin

Date:

21-NA-054
March, 2024

TECHNICAL
Subject:
Brand:

Various Instrument Cluster Functional Concerns or DTC U0155 Set
Model:
Enclave

Buick

LaCrosse
(China)

Cadillac

CT6 (China)
Blazer

Chevrolet

GMC

Model Year:
from

VIN:
to

from

to

—

—

Engine:

Transmission:

—

—

2022
2023
2023
2021

Camaro

2023

Malibu
Traverse

2022

Acadia

2021

Terrain

2022

2023

Involved Region or Country

North America, Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru,
Uruguay, Europe, Middle East, Israel, Japan, GM Korea Company, China, Taiwan,
Philippines

Additional Options (RPOs)

Equipped with Instrument Cluster UHS

Condition

Some customers may comment that intermittently the instrument panel cluster (IPC) may
exhibit any of the following conditions:
• IPC resets. This might include symptoms of the driver information center (DIC) going
blank, IPC lighting turning off, and gauges moving to zero followed by the DIC,
lighting, and gauges all returning to operation on their own. If this reset were to occur,
it would recover on its own during the ignition cycle and is not permanent.
• The center display (DIC) may be blank at startup, but gauges still work. This may
recover on its own, but at times it may be blank for an entire drive cycle and recover
with an ignition cycle.
• The gauges are inoperative. This may recover on its own, but at times it may be blank
for an entire drive cycle and recover with an ignition cycle.
• Odometer shows dashes instead of the vehicle mileage.
• Diagnostic trouble codes (DTC) may not set with each condition. Technicians may find
that other modules may set loss of comm DTCs U0155 – Lost Comm with Instrument
Cluster.
• Steering Column Adjustment Unlocked message illuminated in the DIC.
• Service AWD message illuminated in the DIC.
• Certain IPC drive modes cannot be selected, skipped, or stuck in one mode
(Camaro only).

Cause

This may be caused by a software anomaly.

Correction

Note: The IPC software may have been updated prior to 10/17/22, however, there is a
newer software level available that addresses the concerns in this bulletin. Please update
with the latest software level.
Reprogram the instrument panel cluster via Programming, USB File Transfer, and Setup
and Configuration, in that specific order.

Copyright 2024 General Motors LLC. All Rights Reserved.

Page 2

March, 2024

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 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.
• Please verify that the radio time and date are set
correctly before inserting USB drive into vehicle
for programming, otherwise an error will result.
• 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-054

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-054

March, 2024

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

March, 2024

Bulletin No.: 21-NA-054

5644477

Important: Techline Connect screen shown above.
Important: If the same calibration/software warning is
noted on the TLC or SPS 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. Record the WCC on the job card. No
further action is required. Refer to the Warranty
Information section of this bulletin.
1. Reprogram the instrument cluster. Perform all
three events, Programming, USB File Transfer,
and Setup and Configuration in that order. Refer to
P16 Instrument Cluster: Programming and Setup
in SI.

Bulletin No.: 21-NA-054

March, 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 SPS Warranty Claim Code (WCC) screen shown
above on the job card. Refer to callout 1 above for the
location of the WCC on the SPS screen.
2. Record the SPS Warranty Claim Code on the job
card for warranty transaction submission.

Page 6

March, 2024

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

Instrument Cluster
Reprogramming for Cluster
Errors

0.3 hr

2889248*
Add

Install Software with USB UHS, UDV, UDD

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-054

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

Bulletin No.: 21-NA-054

March, 2024

Page 7

Version

8

Modified

Released March 09, 2021
Revised June 01, 2021 – Updated the Involved Region or Country section and a step in
the Correction section, added a Tip and changed the programming sequence of events in
the Service Procedure.
Revised October 12, 2021 – Added Europe to Involved Region or Country section,
Camaro only information to Condition section and updated programming process in
Service Procedure.
Revised November 08, 2021 – Added DTC U0155 to Subject.
Revised February 02, 2022 – Updated the Subject, added 2022 GMC Acadia, updated
the Involved Region or Country section, added additional condition to Condition section,
and updated programming procedure within Service Procedure.
Revised October 20, 2022 – Added the 2022–2023 Model Years, the Buick Enclave,
Chevrolet Traverse, GMC Terrain models, the Important statement at start of Service
Procedure and a Note in the Correction section.
Revised February 06, 2023 – Updated the Involved Region or Country section and
changed to a unique Labor Operation with Add condition under Warranty Information.
Revised March 22, 2024 – Added two conditions to the Condition section and added
Additional SI Keywords.

Additional SI Keywords: adjustment, all wheel drive,
base, check, ice, level, mark, skip, snow, sport, steering
column, tour, track, up, up-level, uplevel

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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