20NA238 Service Bulletin/Repair Instructions

Bulletin No.:
Service Bulletin
Date:
20-NA-238

January, 2021
TECHNICAL

Subject:

Brand:

Cadillac

Chevrolet

GMC
Radio Software Version V153 Update

Model:

CT4

CT5

Suburban

Tahoe

Yukon

Yukon XL
Model Year:
VIN:
from
to
2021
2021
2021
2021
2021
2021
from
to
—
—
Engine:
Transmission:
—
—
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.

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.
Correction
Copyright 2021 General Motors LLC. All Rights Reserved.
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
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
•
•
•
•

•
Bulletin No.: 20-NA-238
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
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
Page 3
• 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 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.
Page 4
January, 2021
Bulletin No.: 20-NA-238
5644477
5431207
Bulletin No.: 20-NA-238
January, 2021
Page 5
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.
5644478
Page 6
January, 2021
Bulletin No.: 20-NA-238
5431209
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

2887128*
Description
Labor Time
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.
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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TECHNICIAN

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