Service Bulletin

Bulletin No.:

21-NA-044

Date:

May, 2021

TECHNICAL
Subject:
Brand:
Chevrolet
GMC

Vehicle Software Update (VeSCoM)
Model:
Suburban
Tahoe
Yukon
Yukon XL

Involved Region or Country

Model Year:
from

to

2021

2021

2021

2021

VIN:
from

Engine:

Transmission:

to

North America

Additional Options (RPOs)

Condition

Some customer 2021 SUVs need to receive the latest vehicle software configuration
management (VeSCoM) software update.
Some of the notable messages and/or DTCs technicians may find in the DIC corrected
through VeSCoM include:
• U0132 Service Leveling or Service Headlamp
• IPC- Intermittent Blank IPC
• P2B87 AUX Water Pump
• U0230 Power Liftgate Inoperative
• U3006 and U3007 Low Voltage
• Rear Seat Infotainment - Touch inoperative
• U3000.49 Service Driver Assist - LRR
• U3000.71, .72, .96Service Steering Column Lock ESCL
• EBCM C0024 Antilock Brake System
• P12A6 No Start - ECM
• No Start/DIC/MIL - Low Battery Voltage
• No Backup or 360 Cameras - VPM Offline
• C2A21 Park Brake, EPB Light and "Service Transmission" after Low Voltage
• No Start or MIL with U1962 Data Communications
• Service Leveling System - No DTCs

Cause

The cause of the condition may be software anomalies.

Correction

Dealers will sequentially reprogram affected modules with service programming system
(SPS) or techline connect (TLC).

Service Procedure
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.

Copyright 2021 General Motors LLC. All Rights Reserved.

Note: Carefully read and follow the instructions below.
•

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.

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Bulletin No.: 21-NA-044

•

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

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Important: Techline Connect and TIS2WEB screens
shown above.
Important: If the Same Calibration/Software Warning
is noted on the TLC or SPS Summary screen, select
OK and follow on-screen instructions. The system will
generate a warranty claim code (WCC) for
documentation purposes only. Perform service
information (SI) diagnostics to determine the cause of
the condition. Use the applicable labor operation code
when submitting a warranty claim. Do NOT use the
WCC with the warranty claim submission.
Important: When programming a module in GM’s new
Vehicle Intelligence Platform, or VIP, the power mode
(ignition) needs to be off or errors may occur. This
involves the 2020 Chevrolet Corvette, Cadillac CT5 and
CT4, as well as the upcoming full-size Chevrolet, GMC,
Cadillac SUVs and Buick Envision. Serial Data
Message Authentication also needs to have the
ignition off.
Important: This Field Action Sequence will not run
Serial Data Message Authentication (SDAC)
automatically at the end. If Authentication Serial Data
DTC’s are set, please reference Document ID: 5199706
in eSI DTC U1960-U1962, U3034, or U3035.
1. Reprogram the sequential multiple modules
through SPS/Techline Connect (SPS and Techline
Connect screens shown) by selecting “ZFA Multimodule Coordinated Sequence-Bulletin
N202318500” on the select controller screen as
shown. Select “Next” and follow all on screen
instructions.

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Note: The screenshots above are 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. After programming is finished, open GDS2.
Navigate to Vehicle Diagnostics -> Vehicle DTC
information and clear codes in all modules.
3. Record SPS Warranty Claim Code on job card for
warranty transaction submission.

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Bulletin No.: 21-NA-044

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
9700025*

Description
Sequential Module Reprogramming with SPS or TLC

Labor Time
1.1 hr

*This is a unique Labor Operation for Bulletin use only.
Important: **To avoid warranty transaction rejections, carefully read and follow the instructions below:
• The Warranty Claim Code must be accurately entered in the “SPS 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 “SPS Warranty Claim
Code” field of the transaction, otherwise the transaction will reject. It is best practice to enter the FINAL code provided by
SPS/SPS2.

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 SPS/TLC on the computer used to program
the vehicle.
2. Select and start SPS/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.
Version

2

Modified

Released March 09, 2021
Revised May 10, 2021 – Updated Subject, Service Procedure, and Warranty Information
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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