21NA145

Service Bulletin
Bulletin No.:
21-NA-145
Date:
June, 2021
TECHNICAL
Subject:
Radio Software Version U157 Update
This bulletin will replace PIT5792 and PIT5808. Please discard all previous copies of both
PIT5792 and PIT5808.
Brand:
Model:
Model Year:
from
Enclave
Buick
Encore GX
VIN:
to
from
to
—
—
Engine:
Transmission:
—
—
2021
2020
Verano
2020
CT6 (China)
Cadillac
XT4
XT5
2020
2020
XT6
Blazer
Camaro
Cruze
Chevrolet
Silverado
1500
2020
2020
Silverado
2500HD/
3500HD
Traverse
Trailblazer
2021
2021
Acadia
Sierra 1500
GMC
Sierra
2500HD/
3500HD
2020
2020
Involved Region or Country
North America, Europe, Russia, Middle East, Israel, Palestine, Brazil, Chile, Colombia,
Ecuador, Paraguay, Peru, Uruguay, Japan, Cadillac Korea (South Korea), GM Korea
Company, China, Thailand
Additional Options (RPOs)
Equipped with Infotainment System RPOs IOS, IOT or IOU
Condition
Some customers may comment on software related issues. Continuous improvement
software updates are being released with improvements made in several areas. Refer to
the U157 Most Notable Improvements section below.
Cause
The cause of the condition may be software anomalies.
Copyright 2021 General Motors LLC. All Rights Reserved.
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Correction
June, 2021
Bulletin No.: 21-NA-145
A new radio software update, version U157, is being released for vehicles equipped with
Infotainment system RPO IOS, IOT or IOU, in addition to providing general robustness
and stability enhancements. This update includes all enhancements from previous
software version releases.
On some vehicles listed, this update can occur remotely through in-vehicle prompts from
the radio display. 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 fleet customers may need the dealer to reprogram the radio
with the new software package.
U157 Most Notable Improvements
Important: Improvements will vary by model, build
configuration, system, and sales region. Not all
vehicles have all features.
Bluetooth
• Radio display goes black while adjusting the
volume knob
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
• Predictive navigation cannot be enabled
OTA Update
• An over the air (OTA) update might not install, or
fails to install, due to vehicle health check failing
Sirius XM
• The radio displays XM Loading or Acquiring
Signal when attempting to use Sirius XM and was
temporarily resolved by changing the SXM station
(Channel Up or Channel Down)
System
• Improvement in DTC U18B4 algorithm to reduce
false triggers in Amplifier and OnStar
• Radio displays “Update Failed. Return to dealer”
message
• Radio locks up and display is blank in cold
ambient temperatures
• When attempting to open the Trailering app in the
radio display the display goes blank and pressing
the Home key returns the display to the
Home page
Phone
• OnStar TTY keyboard disappears when vehicle
goes into motion during an OnStar
SuperCruise call
OnStar
• Improvement in ethernet DTC diagnostics for
intermittent U18B4, B1B2F, and U1008 in the
OnStar module that may clear with an ignition
cycle
Service Procedure
Important: Some technicians are reporting that the
radio remains on “v148” or another previous version
after the radio displays the software update completed
successfully. It is important to ensure that the
technician is inspecting the Build Number, 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 could begin with the letter W after installing
U157. This is NOT the software version and is not
unique to the U157 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 U157.
Important: Be sure to keep the vehicle doors closed
prior to beginning, and during, the USB programming
event.
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.
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: 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.
Tip: Tripping the door latch to closed status with the
door open will allow exit of the vehicle during the
programming process. Do NOT open the latch until
programming is complete.
Tip:
• Once the USB update is initiated, there is no need
to monitor the progress.
• If an Infotainment over the air (OTA) update is
present in the radio Updates menu, check for and
reference any applicable field action bulletins first.
•
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.
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 U157 or greater then stop,
this bulletin does not apply.
• If the build number is less than U157, proceed
to step 2 to update the radio software.
2. Reprogram the A11 Radio software via USB. Refer
to A11 Radio: Programming and Setup in SI.
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Bulletin No.: 21-NA-145
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
2887408*
Description
Labor Time
Radio Module
Reprogramming with SPS/
USB for U157
0.6 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.
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
1
Modified
Released June 21, 2021
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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