Bulletin No.: 23-NA-227

Service Bulletin

Date: July, 2024

TECHNICAL
Subject:

Radio Software Version W27E-172.5.1-M169-SQBR4-126.1 – Multiple
Updates for IVD and IVE
This Technical Service Bulletin replaces PIT6092. Please discard PIT6092.

Brand:

Chevrolet

Model:

Blazer EV
Silverado EV

Model Year:
from

to

2024

2024

VIN:
from

Engine:

Transmission:

to

Involved Region or Country

North America

Additional Options (RPOs)

Equipped with RPO IVD and IVE.

Condition

Some customers may comment on 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

For Blazer EV procedure refer to bulletin 24-NA-092..
A new radio software update, version W27E-172.5.1-M169-SQBR4-126.1, was released
to service for vehicles equipped with Infotainment system RPO IVD being brought into
the service department. 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; fleet customers may need the dealer to reprogram the radio with the new software package.
This new radio software update has been released via an Over-the Air-Update. Customer
will receive a Software Update notification once the software has been downloaded to
their vehicle. Customers need to accept the OTA when prompted.
Caution: to avoid potential programming errors, ensure both programming events (Programming and USB File Transfer) are performed.
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:

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.
Important: This technical service bulletin (TSB) can
only be completed by certified repair facilities who have
met all specific training, tool and equipment requirements pertaining to the vehicle Brand and Model
serviced. Repairs must be performed by a technician
who has successfully completed the required training.

Copyright 2024 General Motors. All Rights Reserved.

Notable Improvements:

Radio:
• Stability improvements
• RVC does not work or shows red triangle
• Delayed RVC
• Cannot launch Android Auto/Apple CarPlay
• Infotainment lockout while driving not working
• HVAC screen missing icons/text
• Bad audio quality
• CarPlay black screen

Page 2

July, 2024

Bulletin No.: 23-NA-227

• No Audio

• Pop up disappears too quickly

• Radio stays on Bluetooth instead of Android Auto/
Apple CarPlay

• Bluetooth media not shown when phone
connected

• Virtual Controls not responding when pressed
during welcome animation

• Presets change order after key cycle

• Add Phone button not responding

• Radio crashes when long pressing power button

• Welcome animation freezes

• Bluetooth not working

• Camera view selection not available

• Bluetooth will not reconnect

• Overspeed chime does not continuously play

• Button layout errors

• Pop Up Window layout issues

• Radio sets DTC B1596.82 with no impact to RVC
function

• Welcome animation plays twice after quick door
open ignition on
• Reset Trip not functioning

• Bluetooth media queue not correctly showing

• RVC Launches On Its Own

• Add profile stuck loading

• Camera app exit and view selection buttons don't
come up

• Universal Remote settings do not respond correctly

• Some buttons do not respond

• Ambient Lighting app crashes

• Camera app layout and views distorted

• Ambient lighting app not working

• System settings not retained over key cycle

• Ambient Lighting missing audio selection feedback

• Camera view selection not available

• Forward camera exits at speeds lower than target
speed

• Theme cards missing

• Radio does not respond/freezes

• Trailer profile notifications persist

• Driver settings not being saved

• Cannot control Ambient Lighting

• Trailering Light Test screen stuck

• Trailering total mileage not updating

• Android Auto display shifted on the screen

• Turn by Turn error message displays incorrectly

• Android Auto/Apple CarPlay won't launch after
switch user

• Cannot open virtual controls window

• Profiles page blank after deleting new profile
• Radio resets after sleep cycle

• Cameras do not close while driving or when in park

• User account name not updating
• VCU stuck in GUEST user

• Audio app crashes

• Virtual controls do not respond when camera view
is up

• RVC stays on incorrectly

• Can't dismiss pop ups

• Audio does not lower for notifications

• Voice search not available when driving

• Switching themes not working

• Can't sign into Google Play Store

• (EV only) Audio issues when using MaxPower
Mode

• Window position Virtual Controls not working

• Tire pressure not updating (vehicle info)

• CarPlay screen changes to home screen on its
own

• Audio plays during a call

• XM not available

• Audio settings page layout errors

• (EV only) Charge battery pop up does not come up
when using Max Power below SOC level

• Blank screen when pushing back button on teen
driver add key pop up

• Audio stuck on Bluetooth source

• Virtual Lighting controls not functioning

• Climate app not functioning

• Wrong units shown

• Camera DTC B1C47 set incorrectly

• Temperature on radio display not updating

• Connect Phone list dialog box shows excess
material

• OnStar Turn by Turn starting audio sometimes
does not play
• Bluetooth media continues playing after source
change

• Crash from SXM Browse Screen
• Phone app unresponsive to touch
• Podcasts show default album art

Bulletin No.: 23-NA-227

July, 2024

• Date/Time display errors out when turning off
vehicle

• Incorrect translation

• Pop ups not appearing

• Vehicle image missing in Vehicle Info app

• Profile loading repeats

• Keyboard does not pop up when entering
password

• Radio app layout errors

Page 3

• VCU resets and U164E set in multiple modules

• Radio display defaults to Virtual Controls screen on
ignition

• Virtual Controls app will not open

• Radio does not retain last screen after sleep cycle
• Driver PIN is not cleared after software update

• Virtual controls window sized incorrectly and cuts
off some buttons

• Radio presets not working

• Loss of all audio and chimes over key cycle

• Radio resets during emergency call

• Voice assistant pop up stuck

• Embedded apps not updating

• Welcome animation missing vehicle model

• Radio stays on around 20 seconds after vehicle
shutdown

• Media app plays incorrect source

• Embedded Maps app view distorted

• WOW Mode animation not working

• RVC does not brighten in dim settings

• XM Media app shows "Unavailable" but music is
playing

• LCDD provisioning fails and gets stuck

• Wi-Fi name and password cannot be changed

• Emergency announcement does not interrupt
audio from other sources

• MyBrand won't install

• RVC screen flickering

• Navigation crashes

• Exit "X" button not working on some apps

• No data on connected devices

• Service tire pressure monitor message shown
incorrectly

• Radio display start up animation failed

• External Wi-Fi password not saved
• Favorites window shifting
• QuickStartUp fails to resume
• Geofencing creation issues
• SXM favorites do not play audio
• Geofencing positioning errors
• Teen driver options not responding
• Google Assistant pop up does not display
• Third party app not shown on new user profile
• Google Maps freezes when editing route during
route calculations
• Traffic Signal Recognition telltale not following
driver setting
• Trailering app crashing
• HVAC menu doesn't provide feedback when
changing fan speed
• Trailering notification missing
• Trailiering app crashing
• HVAC Temp Knob doesn't respond
• Incorrect Google Map data shown

• Camera UI not responding after shift from PARK
• Camera gridlines incorrectly sized
• OnStar call stuck on connecting screen
• OnStar missing location notification during calls
• Climate app not functioning with pop up "vehicle
must be running" when vehicle is already running
• Radio loses some connected services function
after factory reset
• Active Noise Cancellation creating loud droning
and other audio abnormalities inside of vehicle

Phone:
• CarPlay audio still through vehicle when toggled to
phone
• Phone auto-connect not functioning after profile
change
• Incoming call alert not shown when in another call
• Android Auto shows wireless charging icon incorrectly
• Text messages pop up not shown in vehicle

• Incorrect information when on two calls

• Bluetooth audio lost after voice assistant long
press

• Turn signal sounds plays incorrectly

• "Add Phone" button not working

• Incorrect pop up for Auto Park Assist cancellation

• No sound when using Android Auto

• USB auto-rejected for corrupt song

Page 4

July, 2024

Bulletin No.: 23-NA-227

• Call Ended shown incorrectly when disabling call
profile

• (Cadillac only) Radio display flickers after using
MFC

• Phone pairing dialogue pops up every key cycle

• HUD not working after deep sleep

• Call timer shows negative value after call
reconnect

• Radio display loss of touch and erratic dimming

• Cannot launch Android Auto/Apple CarPlay
• Cannot repair Bluetooth devices

• Speed Limit icon will not disappear when driver
setting set to Hide

• Text message notification sound not heard

• IPC and HUD info mismatch

• CarPlay Siri does not work after SWC long press
radio reset

• Cluster navigation option missing

• Phone screen shows blank when canceling in
progress Bluetooth pairing

• HUD settings not remembered

• Blank Cluster display

• Bluetooth audio start up volume too high

• Transmission temperature gauge color on Cluster
shows red hot when vehicle is within operating
temperature range

• Bluetooth crashes when cable is unplugged

• Cluster reset

• Bluetooth device listed twice in media

• Lane lines don't show colored in Cluster Assist
layout

• Cannot pair device as pair mode stuck OFF

• Navigation route on Cluster display is not still
shown after ignition cycle with STR
Display:
• Radio Black Screen
• IPC and ICS info mismatch
• Cluster layout issues
• Blank Screens and/or Update Failed Screen after
low voltage/dead battery
• Speedometer not updating
• Both displays show a black screen
• No Touch Response on radio display
• Cluster screen flickers

• Android System message at start up
• HUD shows cruise at "0" instead of "--" when no
speed is set
• Vehicle info apps show "Add to Driver Display"
when already shown
• Display layout issues
• Drive mode app flickers when changing modes
• Pressing "Turn Off Display" can cause the display
to get stuck in a flickering/resetting cycle
• Service Display message and loss of radio screen
and virtual controls

• Radio display multiple overlaying screens
• Black radio screen at startup
• Delayed Cluster load
• Trailer Gain not shown on Cluster
• Blank Cluster display with telltales
• PRND stuck on reverse

Programming:
• "Update Unsuccessful" message stuck on until full
sleep cycle
• LCDD provisioning fails and gets stuck

• eAWD telltale not activating

• "Vehicle Software Updates are available" does not
show on every ignition

• Radio Display Illumination Too Dark Compared to
Cluster Display

• Radio screen shows no icons after programming

• Fuel Economy scale missing
• Cannot remove Cluster Info tile
• HUD black screen for key cycle
• CarPlay maps black screen on Cluster display
• HUD blank with radio setting B19B0

• Speed limit shows dashes after software update
• Blank screen during USB programming
• USB recovery status bar shows on cluster display
• Cannot enable Quick Start Up after USB Update
• No success pop up or record of USB updates

• Offroad display stuck on
• HUD missing info and not responsive
• Quickly switching between Cluster views causes
display failures/hang ups

Energy App:
• Charge Scheduling did not work
• Screen turns off when launching Charging app

Bulletin No.: 23-NA-227

July, 2024

Page 5

• Charge app inoperable

• Charging App cannot access data

• Missing dialogue info for charge complete/stopped

• Cannot set charge level

• Schedule home screen formatting issues
Version

5

Modified

Released December 22, 2023
Revised January 25, 2024 – Added the 2024 Chevrolet Blazer and RPO.
Revised February 05, 2024 - Changed Labor Operation under Warranty Information Section.
Revised April 5, 2024 – Added references to proper service procedures in Correction
Section and removed Service Procedure and Warranty Information from bulletin.
Revised June 28, 2024 - Changed reference for Blazer EV and removed reference to
PIT6065 under Correction Section.

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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