Bulletin No.: 24-NA-168

Service Bulletin

Date: August, 2024

TECHNICAL
Subject:

Brand:

Radio Software Version Z172.6 – Multiple Updates for IOK

Model:

Model Year:
from

Chevrolet

GMC

VIN:
to

Corvette

2024

2024

Hummer EV
Pickup

2023

2023

Hummer EV
Pickup
Hummer EV
SUV

2024

from

to

—

—

Engine:

Transmission:

—

—

2024

Involved Region or Country

North America, Argentina, Brazil, Bolivia, Chile, Colombia, Ecuador, Paraguay, Peru,
Uruguay, Europe, Uzbekistan, Russia, Middle East, Japan, South Korea, Thailand, Other
Africa, Australia/New Zealand

Additional Options (RPOs)

Equipped with Infotainment System RPO IOK

Condition

Some customers may comment on radio software related issues. Continuous
improvement software updates are being released with improvements made in several
areas.

Cause

The cause of the condition may be software anomalies.

Correction

A new radio software update, version Z172.6, was released to service for vehicles
equipped with Infotainment system RPO IOK. In addition to providing general robustness
and stability enhancements, this update includes all enhancements from previous
software version releases. Along with the vehicles mentioned above, vehicles in
unconnected markets, and fleet customers may need the dealer to reprogram the radio
with the new software package.

Z172.6 Most Notable Improvements
Important: Improvements will vary by model, build configuration, system, and sales region. Not all vehicles have all
features.
Most notable improvements contained in this release may include:
Audio:
• Audio app may crash and change source on own
• Audio loss when changing drive mode
• No audio after phone call
• No audio and audio app blank
• No audio and volume knob doesn't respond
• No audio on start
• No turn signals audio
• Start-up audio delayed
• With an Android phone paired there is no audio

Copyright 2024 General Motors. All Rights Reserved.

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August, 2024

Bulletin No.: 24-NA-168

Cluster:
• Album Art flashes on XM station change
• When the radio is off there may be a Power icon showing on the audio page. "Audio Off" to let the driver know
the radio is off is missing
Connectivity:
• 4G connection is dropping
Display:
• Audio card crashes and will not recover
• Audio card may freeze
• Black Screen
• Black Screen after accepting TCPS
• Card view Clock app in wrong position on ignition start
• Card view disappears after changing profile
• Card View is blank when profile creation interrupted
• Home Screen glitching
• Loading message for Maps and audio cards
• Maps and Trailering might be missing from the right-side apps view
• The display may look like a picture negative when switched to day mode
• The Home Screen may not have any app icons
HVAC:
• The blower speed turns down at startup by itself
Navigation:
• Google Maps blinking
• Icons incorrect
• Location changing randomly
• Maps blank in porch view
• Maps freezing in card view
• Navigation page will not load on cluster
• Turn-By-Turn may not work
Phone:
• Android Auto screen is cut off and the touch display does not work
• Answer button on the screen does not work
• Apple Music skipping songs
• CarPlay will not connect or is slow to connect
• Customer can't open the CarPlay app through the Home screen icon
• During a call the audio may stay on the handset instead of being heard through the vehicle
• Echo during phone call
• The CarPlay screen might flicker
Profiles:
• Correct password not working when changing from driver profile to new profile
• No incorrect password pop-up when entering incorrect password
• Settings app and new profile do not respond after switching to new profile

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• Stuck on loading message on profile change
Programming:
• Customer may see a message to "restart the system to complete the update”
• Download stuck at 67%
• Flash/Flicker when selecting x button or back button on faceplate
• The OTA update may fail
• The USB update may fail
Radio:
• Keyboard will not come up after change language button is pressed
• The favorites button on the steering wheel controls may not work
SXM:
• Customer sees "No Signal" message
• Customer sees "XM Loading" message
• XM audio pausing for a second when an icon is pressed on any screen
Trailering App:
• Trailer app not launching from card view for first time user
• White screen after clicking done in trailering-towing assist screen
• Your trailering profiles may not sync with the cloud
USB:
• USB data not functioning
Voice Recognition:
• Alexa not stopping on SWC end button press
• Google Assistant asks for device when commanded to play music
• Google Assistant extra-long delayed response time
• No Voice Recognition functions
Stability:
• Card View takes a long time to load apps
• Radio doesn't turn on
• Radio Stays on for a minute after cancelling RAP
• Reboot
• System freezes
• When changing Trailer Maintenance data to 100% the system may crash
• When exiting Camera the app tray and status bar may disappear and the transition is not smooth
Non-GMNA fixes:
• The radio may switch from DAB to FM after an announcement

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.

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Bulletin No.: 24-NA-168

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

5877000

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Bulletin No.: 24-NA-168

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. Record the WCC on the job card. No further action is required. Refer to
the Warranty Information section of this bulletin.
1. Reprogram the radio. Refer to A11 Radio: Programming and Setup.

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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.

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August, 2024

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

Description

Labor Time

2810335*

Radio Reprogramming with
SPS

Use
Published
Labor
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.

Warranty Claim Code Information Retrieval

Bulletin No.: 24-NA-168

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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 August 20, 2024

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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