Service Bulletin

Bulletin No.:

21-NA-053

Date:

April, 2021

TECHNICAL
Subject:

Radio Software Version V155 Update

This bulletin will replace PIC6425 for the models listed. As software is released, models will
be removed from PIC6425 and placed in this bulletin.

Brand:
Buick

Model:
Encore GX
Envision

Model Year:
from

to

2021

2021

2021

2021

VIN:
from

to

—

—

Engine:

Transmission:

—

—

CT4
CT5
Cadillac

XT4
XT5
XT6
Blazer
Camaro

Chevrolet

Malibu

2021

2021

2021

2021

Silverado 1500
Trailblazer (VIN M)
GMC

Sierra 1500

Involved Region or Country

North America, Europe, Uzbekistan, Russia, Middle East, Israel, Palestine, Chile,
Colombia, Paraguay, Peru, Japan, Cadillac Korea (South Korea), GM Korea Company,
China, Thailand, Australia/New Zealand

Additional Options (RPOs)

Equipped with Infotainment Systems IOS, IOU or IOT

Condition

Some customers may comment on software related issues. Continuous improvement
software updates are being released with improvements made in several areas. V155
contains over 100 improvements. Refer to V155 Most Notable Improvements section
below.

Cause

The cause of the condition may be software anomalies.

Correction

A new radio software update, version V155, 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. Reprogram the radio software via USB.

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

Copyright 2021 General Motors LLC. All Rights Reserved.

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.

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April, 2021

Important: After pressing the information icon, review
the full software version file name. In the middle of this
long file name you see the V155 (or numerically higher
if newer versions were released and installed).
V155 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:
Bluetooth
• When answering or ignoring an incoming call, the
incoming call popup will not go away until the
radio goes through a sleep cycle
• Phone battery low message flashes when a phone
with low battery is connected via Bluetooth
• Confirm Bluetooth Pairing screen does not display
the Pair and Cancel buttons
• During an active call, another call comes in the
first call is still displayed after selecting “Switch
(end current call)” and Phone app cannot be
launched after ending the call
Climate
• No audible feedback heard when changing state
of the setting for HVAC audible feedback on/off
Energy App
• Target Charge Level shows Away instead of Home
when changing Location Based Charging from Off
to On
• Improve Charging Time display to account for a
dual mode cord set
• (Non-GMNA) Enable GPS signal transmission in
Radio to allow Location-based Charging feature in
non-connected regions
HMI
• The Weather Channel app does not launch when
touching the temperature in the status bar
• The Sirius XM icon remains active when switching
Sources from SXM to Pandora
• The Air Quality Indicator (AQI) index color
changes automatically with AQI value
• Third party apps may appear in full screen after
shifting out of Reverse, removing the top and
bottom bars from the display at startup
• An unnecessary battery icon appears at the
bottom of the radio display when entering
Hands-free contacts when there is no Bluetooth
phone connected
• Cursor will not focus on the keypad when using
the multifunction control in the phone name edit
screen
• The Collision/Detection System Settings should
be greyed out while vehicle is in motion
IPC Interface
• When changing languages, the change does not
take effect until a page change or a sleep cycle
• Unable to switch to handsfree from IPC if ignition
is cycled off and on during the call

•

Bulletin No.: 21-NA-053

OnStar icon may not appear in Head Up Display
(HUD) at times when making an OnStar call
• OnStar icon may remain active in HUD after an
OnStar emergency call was ended
• Blank pop up in IPC when a call is ended, but
shows correctly in HUD
• Call indicator in IPC does not change when
switching between hands-free and handset modes
• FM display is off-center to the right
• Enable HD Radio message is truncated
• Phone interface appears on right side of cluster,
should appear on the left side
Media
• Numbers disappear in Direct Tune if pressing
them slowly
• Audio app displays device Bluetooth is not
connected when device was paired by Bluetooth
from the device side
• Audio app may not load intermittently. The app
may come up briefly then return to the Home
page. Issue is recovered by a radio sleep cycle
• USB media may not play after having used voice
recognition or Bluetooth media. Cycling the USB
stick recovers USB media operation
• Android Auto does not display metadata and
buttons are unavailable on the Audio Now Playing
screen after switching radio User Profiles
• When on the Audio Off page, pressing a steering
wheel control (SWC) button opens the
Audio Menu
• First Favorite is deleted when any other Favorite is
deleted
• iHeart app displays an additional Seek Back
button in Turn-by-Turn (TBT) screen that is not
present in the app’s main screen, Audio app, or
Porch view
Navigation
• SD Card Messages “SD Card Error – Launch Nav
on Radio for details.” In IPC and “Once initialized,
this Nav SD card can only be used for navigation
in this vehicle” in Radio appears every ignition
cycle when SD card read write switch is in the
read-only position
• Traffic is not shown on cluster and Porch view
• Navigation startup animation and tutorial appears
when speed is >5km/h and the nav app is
launched
• The Predictive card does not return to normal
mode after 15 seconds
• (Non-GMNA) An incorrect address may appear
when searching POIs or EV Charging Stations
that is either the old address of the POI or
combination of the POI’s old and new address
• After closing the Destination Detail view, the old
route may still be displayed in the navigation main
screen
• Native voice assistant is inoperative for an entire
drive cycle

Bulletin No.: 21-NA-053
•

April, 2021

The map is automatically zooming approximately
every 5 minutes while not in an active route
• The Highway shield icon may flash on the map
• The Road Alert triangle is too small
• The Turn Arrow popup for IPC is missing during a
maneuver popup
• The Street Name and Distance to Turn are
displayed in the opposite order on the HUD
Navigation page
• Compass arrow is too close to the speedometer in
HUD Navigation page
• Predictive card Traffic indicator appears
incomplete when displayed on 10 inch screen
• Cannot close the “make your driving experience
unique by creating a profile” popup in the
Navigation app
• Items displayed in the highway exit list are
different depending on whether there is an active
route or no route
OnStar
• When using the myBrand app to send a
destination to navigation and the vehicle is off, the
street number or the complete address may
be lost
• When in any IPC submenu of Navigation, pressing
the left SWC button exits out of the Navigation
menu completely
• A navigation popup may remain displayed instead
of other alerts when exiting while the popup was
displayed
• Unable to change to other IPC pages if a page
change was made during an OnStar call
• TBT view shows Left seek, Pause, and Right seek
buttons with Aux audio source
• Vehicle Location Blocked popup message is
automatically dismissed after approximately 8
seconds
• OnStar Voice Search screen appears answering
an incoming OnStar Advisor call
• TBT Inactive and Active Route views are too close
to, and cut off or overlap, other information in HUD
Phone
• Conference Call and call timer does not display in
the Center
• Phone icon does not display in the left on
sport mode
• OnStar TTY keyboard disappears when vehicle
goes into motion during an OnStar
SuperCruise call
Projection
• When listening to Spotify SWC Favorites switches
won’t change songs, instead opening Sirius XM
and change to SXM Favorites
• Connect USB for wired CarPlay, radio does not
launch CarPlay
• Audio cutout or mutes every 10 seconds when
vehicle is new, unsold in demo mode

•
•

Page 3

Wireless CarPlay will not automatically connect
When switching from another source to wireless
CarPlay that was previously operating but not
active, the display goes blank
• PTT button does not work at startup in CarPlay but
self-recovers later in the same drive cycle
• Embedded navigation switches back to CarPlay
when using Voice Recognition and trying to select
from list of destinations. Switching back to
embedded navigation you can then select
destination from the list
• Status bar overlays screen during CarPlay
phone call
• Upper bar of wireless Android Auto disappears
• Unable to enter the Phone app after an ignition
cycle
• After making the wireless CarPlay connection, it
may not reconnect if disconnected on the
phone side
• CarPlay audio pauses if RSI video player was
used during CarPlay and then switched to RSI
audio player
• Android Auto session drops out on longs trips
Settings
• Lane change assist customization menu incorrect
• Display flashes while moving the Air Quality
Interface slider bar
• System page is blank when entering Home >
Settings > System
• Visualization Settings is set to Off by default
• Driver mode visualization page is blank
• Description of Engine Sound Settings menu is
inaccurate
System
• After installing Spotify, a banner will appear at the
top of the screen requesting user to log in for
entire ignition cycle
• The Clear All button in the Notification page
overlaps with the OnStar TBT notification Close
button
• (China) Screen turns black when shifting out of
Reverse, into Park, while in Valet mode
• Screen is black for 60 seconds or longer
• Valet mode cannot be disabled or unlocked
• Radio boots up slowly, then resets itself
• Radio stays active after retained accessory power
(RAP) timer has expired
• Unable to increase or decrease SXM channel in
Content Area with the multifunction control
• SuperCruise audible alert, the phrase “take
control” is cut off of the “take control of the vehicle
now” audible alert
• Radio locks up or display is blank in cold ambient
temperatures

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April, 2021

Sirius XM
• SXM is on Channel 2 after radio sleep cycle if it
was previously on Channel 56
• Sirius XM no audio, or displays XM Loading, or
displays Acquiring Signal at startup until switching
to another SXM station
• Radio displays Tuner Initializing on AM, FM, and/
or XM
• SXM shows blank after cycling ignition off and
back on
Translation (Non-GMNA)
• Valet Mode translation to Brazilian Portuguese is
not standard
• Korean translation - Heat should not have been
translated in Climate app
• Android Auto – Switch Session, Switch Phone
was not translated to Korean
• Incorrect Korean translation of “Target Charge
Level – Away”
Voice Recognition
• Improve Offboard Voice Recognition (OBVR)
phone book upload

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.

Bulletin No.: 21-NA-053

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 NOT connect 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.
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.

Bulletin No.: 21-NA-053

April, 2021

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5644477

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April, 2021

Bulletin No.: 21-NA-053

5431207

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 screen instructions. After a successful
programming event, the WCC is located in the Service
Programming System dialogue box of the SPS
Summary screen. No further action is required. Refer to
the Warranty Information section of this bulletin.
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 V155,
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.

Bulletin No.: 21-NA-053

April, 2021

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April, 2021

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

2887188*

Radio Reprogramming with
SPS/USB for V155 Update

0.3 hr

Bulletin No.: 21-NA-053

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.

*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.
Version

2

Modified

Released March 10, 2021
March 30, 2021 – Added additional Models, updated the Involved Region or Country
section and added an additional symptom to the System section under V155 Most
Notable Improvements.

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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