Bulletin No.:

Service Bulletin

Date:

23-NA-145
November, 2023

TECHNICAL
Subject:
Brand:

Radio Software Version 167.5
Model:

Model Year:
from

to

Encore GX
Buick

2024

Trailblazer
Trax

2024

to

SOP

Built before
July 6, 2023

SOP

Built before
July 5, 2023

SOP

July 1, 2023

SOP

July 6, 2023

2024

Envista
Chevrolet

Build Date:
from

2024

Engine:

Transmission:

—

—

Involved Region or Country

North America

Additional Options (RPOs)

Equipped with Infotainment RPO IVA

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.
Important: Refer to A232424320: Safety Recall - Intermittent Instrument Panel
Blackout.
A new radio software update, version 167.5, was released to service for vehicles
equipped with Infotainment system RPO IVA 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.
Important: Chevrolet Trailblazer was built with version 167.5, bulletin Labor Operation
does not apply. Refer to SI for the standard radio programming procedure.
Note: Vehicles equipped with the RPO IOR radio do not get 167.5 and uses a totally
different software. DO NOT attempt to program an IOR radio with the software referenced
in this bulletin.

Correction

Copyright 2023 General Motors LLC. All Rights Reserved.

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.
• 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.
• Ensure Radio RPO is IVA and not IOR.
• Ensure USB stick is FAT32 formatted and blank. Add a folder named "update" to the
root directory.
• Ensure the programming file "85041810" is selected for download from SPS Radio
USB File Transfer.
• Place the 4 files: 85041807.bin, 85041808.mnf, 85041808.smd, 85041809.bin in
"update" folder.
• Ensure the ignition is ON and engine is running. Engine needs to be running for
programming to proceed.

Page 2

November, 2023

Most notable improvements contained in this release
may include:
• Phonebook sometimes will not display or load.
• Wired CarPlay may disconnect and not reconnect.
• Wireless CarPlay intermittently will not connect.
• CarPlay disconnects when browse button is
pressed.
• 3-way calling selection may not work.
• Android auto will not reconnect after short sleep
cycle when vehicle is restarted.
• Wireless Android Auto will not connect
automatically.
• Connected Android devices may not display
recent calls or contact list.
• Incoming calls may not show up on IPC.
• Call view on IPC may not go away after a
phone call.
• Call view may not go away on radio display after
ending a phone call.
• Cannot make call when selecting a contact on the
radio display.
• Change oil soon on IPC cannot be dismissed.
• In vehicle Wi-FI may not work.
• General stability improvements to address black
screen issues on radio and IPC displays.
• Black screen with X when shifting from reverse to
drive.
• Radio and IPC displays go black after a stop start
event.
• Start up animation flickering on radio display.
• System may reset after removing a USB memory
stick.
• Album art not displayed in USB "Now Playing"
screen.
• IPC may freeze while driving.
• Radio and IPC may freeze if shifting from Park to
reverse to drive very quickly after startup.
• No red zone of fuel gauge is displayed on gauge 1
(Buick only).
• IPC resets to gauge set 1 even if that was not the
last one used.
• Steering wheel switches may be inoperable at
times.
• Clock freezing and not updating.
• Rear camera may stay on after shifting out of
reverse.
• If shifting from Park to reverse quickly after start
up the gridlines may disappear.
• When shifting from reverse to park, the radio
display may be black with the reverse gridlines.
• After start up home screen may be blank.
• Radio display and IPC taking longer than normal
to boot up.

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Bulletin No.: 23-NA-145

Bluetooth sometimes will not connect
automatically.
Gauge cluster appearance improvement and
corrections.
IPC taking longer than normal to boot up.
Selecting defrost in HVAC may direct air to defrost
and floor.
Fan speed may not slow down when receiving
a call.
Service Tire pressure monitoring system may
display on IPC.
Service Side Detection message may display
on IPC.
Volume may go up on its own.

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.
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.

Bulletin No.: 23-NA-145

November, 2023

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

Page 3

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.

5743643

Page 4

November, 2023

Bulletin No.: 23-NA-145

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

5877000

5644477

Bulletin No.: 23-NA-145

November, 2023

Page 5

Important: Techline Connect screen is 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. Document 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 in the Service Manual.

5644478

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.

Page 6

November, 2023

Bulletin No.: 23-NA-145

Version

5

Modified

Released August 18, 2023
Revised September 19, 2023 – Added Build Date information and the first Important
statement and Note to Correction section and updated the most notable
improvements list.
Revised October 19, 2023 – Added the last bullet point to list under most notable
improvements.
Revised October 30, 2023 – Added build date information for Trailblazer, Additional
Options (RPOs) section and last bullet item to improvements list.
Revised November 22, 2023 – Added reference to Safety Recall in Correction section
and removed Warranty Information.

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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