Radio Software Version V153 Update – 2021 Cadillac Chevrolet GMC

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Service Bulletin Bulletin No.: 20-NA-238
Date: January, 2021
TECHNICAL
Subject: Radio Software Version V153 Update
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Cadillac
CT4
2021 2021
— — — —
CT5
Chevrolet
Suburban
2021 2021
Tahoe
GMC
Yukon
2021 2021
Yukon XL
Involved Region or Country North America, Russia, Middle East, Israel, Palestine, Chile, Colombia, Ecuador,
Paraguay, Peru, Uruguay, Japan, Korea, Thailand
Additional Options (RPOs) Equipped with Infotainment System IOS, IOU or IOT
Condition
Some customers may comment on software issues. A continuous improvement software
update was released with updates made in several areas. There were two updates
released in Production very close to each other. At the time of initial bulletin publication,
the most current software version available to service was V153. Some vehicles may
have been manufactured with a software version of V152 or less, while newer vehicle
builds may have been produced with V153. This service bulletin covers the V153 release.
As always, the most current release includes all enhancements from previous software
version releases. V153 contains over 100 improvements. Refer to V153 Most Notable
Improvements section below.
Cause The cause of the condition may be software anomalies.
Correction
This update can occur remotely through an Over-the-Air (OTA) update to the radio
module. However, some customers may decline the vehicle update, or the update may be
unsuccessful. Along with the vehicles mentioned above, vehicles in unconnected
markets, and some fleet customers may need the dealer to reprogram the A11 radio
module.
A new radio software update, version V153, was released to service for vehicles
equipped with Infotainment system RPO IOS, IOU or IOT. In addition to providing general
robustness and stability enhancements, this update includes all enhancements from
previous software version releases.
Important: Some technicians are reporting that the radio remains on an older software
version after the radio displays the software update completed successfully. It is
important to ensure that the technician is inspecting the full information found within Build
Number and not other rows of information on the same screen. This requires the user to
locate the Build Number, and then select the Information icon (circled lower-case i) to see
the full software version file name. In these radios, the build number may begin with a
letter other than “V” but this is NOT the software version and is not unique to the software
release.
Important: After pressing the information icon, review the full software version file name.
In the middle of this long file name you see the V153 (or numerically higher if newer
versions were released and installed).
Page 2 January, 2021 Bulletin No.: 20-NA-238
V153 Most Notable Improvements
• Automated Mapping Module
• (Non-GMNA) Does not connect to server in
China
• Advanced Parking Assist
• Screen freezes when searching for a
parking spot
• Message to apply parking brake appears at
incorrect time
• Audio and Media
• When navigation prompt is playing and user
attempts to adjust volume, the Audio volume
adjusts instead
• Switching from Bluetooth streamed audio to an
OnStar call, the Bluetooth audio volume
increases for a short time before the OnStar
ring tone is heard
• Radio may not switch to selected Favorite
• Improve vehicle graphics in Fade/
Balance page
• Forward/Skip hard buttons change source
while listening to SXM
• Loss of radio audio for entire drive cycle,
chimes still function
• Unable to complete indexing of media when
using iPhone as a USB playback device (not in
CarPlay)
• (Non-GMNA) iPhone using Baidu CarLife may
display connection status incorrectly
• Energy App
• Improve Energy History graph display
• Incorrect Battery Gauge state of charge
• Improve main charging screen functionality
• Bottom of Charging setting pull down is not
displayed
• Must press Save twice for Delayed Charge, or
when removing the Home location from
Location Based Charging menu
• HMI
• Improve SuperCruise lane change
customization
• Improve multi-function controller interface
• Message pops up to switch to V-Mode or
My Mode
• Device Remote Access has different font styles
on the same page
• Cellular signal status displayed in
Non-Connected countries
• Low resolution of startup splash animation
• Improved Air Quality status bar behavior
• Climate app has a delayed opening from the
pop-up banner
• IPC Interface
• Both Cancel and OK are highlighted when
selecting an HD Favorite through steering
wheel controls while HD is turned off
• DIC displays “Loading” and the steering wheel
controls are non-responsive if the other person
ends the call as the user is opening the DIC
phone menu
• DIC menu flashes twice at times when scrolling
through DIC media menus
• Head Up Display (HUD) shows OnStar or
Phone information overlapping displayed
values
• IPC Help information may not display properly
• HUD continues to display OnStar call or
Emergency call after the call has ended
• HUD may not display song information playing
through Android Auto
• A comma in a Contact phone number may
display as “ext.” instead of “,” in the DIC
• IPC is missing graphic for MyMedia when
MyMedia is playing
• “Press Handset to switch call to phone” shows
both options selected or deselected at the
same time
• “Press Handset to switch call to phone” may be
truncated in display
• Over-the-Air Update
• First attempt to install an OTA may fail, second
attempt is successful but could cause a battery
drain
• Display may go black, flash, or back to the
Update Available screen five seconds after
selecting Install
• Display shows update failed after pressing
power button although update was successful
• Display is black instead of showing Update
Available screen
• Rear Seat Infotainment
• Change text for Miracast and Bluetooth
headphones to avoid confusion over
functionality
• Muted text is overlapping
• Audio page shows “Unreadable Device”
instead of “No Content Available
• Screen flash at times when reconnecting a
Media Transfer Protocol (MTP) device
• Phone
• Apple device audio playback improvement
• Sirius XM
• SXM Browse does not display “action
unavailable while driving”
Bulletin No.: 20-NA-238 January, 2021 Page 3
• System
• Performance Data Recorder robustness
enhancements
• Cannot exit/unlock Valet mode
• OnStar phone can be selected as Outgoing
and Incoming phone in device manager
• Radio displays incorrect driver mode control
visualization screen
• Drive mode popup displays when it is turned off
• Rename Favorite page displays abnormally
• Screen flashes when changing from Seat
Massage to Home page
• Radio using software V152 may freeze
• Navigation
• HUD navigation arrows cut off
• Korean street names truncated
• Tight Turn and Next Turn text are in wrong
locations
• Missing some content in Highway mode
• Main navigation menu still displays old route
after using X in the destination detail view
• Turn by Turn shows previous information after
a stop during the trip
• Day and Night theme may not switch properly
at times
• Missing lane guidance or turn arrow
• Blank IPC during navigation
• Setup Home does not appear after Terms and
Conditions are accepted
• Translation (Non-GMNA)
• Errors in Energy app translations
• My Mode configuration title incorrect in
Chinese
• “Day” is missing from Energy-Charging
Settings screen
• Camera app did not translate “check your
mirrors for safety” into Chinese
• Settings did not translate “request denied” into
Chinese
• Consent pop-up did not translate “granting
access allows %s to:” into Chinese
• WiFi
• Home screen task bar does not display 4GLTE
• Very rarely an external device can connect to
WiFi but have no internet access
• Wireless Projection
• CarPlay phone call changes behavior when
using SuperCruise
• Radio freezes during phone call
• Displays “contacts still loading” when using
voice recognition
• No incoming call ring tone
• Switch to CarPlay, the radio and DIC show
phone as Audio source, but radio is still playing
previous audio selection (e.g. SXM)
• CarPlay display goes black when a call is
ended
• CarPlay displays continuous “loading” circle,
screen goes black, and/or phone does not
connect
• CarPlay displays “Keyboard access limited”
and will not load Google Maps destination
• CarPlay is unable to initiate a phone call from
navigation POI
• Android Auto cuts off navigation prompts
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.
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.
• 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 NOTconnect a
battery charger.
• Ensure the ignition is turned OFF, load on the
vehicle’s battery such as; interior lights, exterior
lights (including daytime running lights), HVAC,
etc. may affect the download process.
• 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.
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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.
1. Inspect the current radio software version.
Navigate to Settings -> About -> Build Number ->
Information “i” to view and verify the software
version. If the build number is less than V153,
update the radio software.
Tip: If the radio displays Conditions are not ideal there
are many reasons this can display but be aware that
stable battery voltage is critical during programming.
Any fluctuation, spiking, over voltage or loss of voltage
will interrupt programming.
2. Install the software update via USB. Refer to A11
Radio: Programming and Setup in SI.
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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.
3. Record the SPS Warranty Claim Code on the 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
2887128* Radio Reprogramming
with SPS
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:
• 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.
Bulletin No.: 20-NA-238 January, 2021 Page 7
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 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 December 23, 2020
January 14, 2021 – This bulletin is being revised to indicate this update may occur
remotely through an Over-the-Air (OTA) update to the radio module, removed Europe
from the Involved Region or Country section and added a Tip for USB programming.

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