20NA178

Bulletin No.:
Service Bulletin
Date:
20-NA-178
November, 2021
TECHNICAL
Subject:
Brand:
Cadillac
Chevrolet
GMC
Service Driver Assist and/or Take Steering Messages on Start-up, Advanced Driver
Assist Systems (ADAS) Features Not Available with DTCs U1614, U1615, U1616 Set
Model:
CT4
CT5
Suburban
Tahoe
Yukon
Yukon XL
Model Year:
VIN:
from
to
2020
2021
2021
2021
2021
2021
from
to
—
—
Engine:
Transmission:
All
All
Involved Region or Country
North America, Colombia, Chile, Ecuador, Peru, Israel, Middle East, Palestine, Russia,
Cadillac Korea (South Korea), China, Japan, Thailand
Additional Options (RPOs)
Equipped with RPO UGN
Condition
Some customers may comment on a Service Driver Assist message and Take Steering
message on start-up, Advanced Driver Assist Systems (ADAS) features are not available
during this time.
During this condition, the Image Processing Module becomes stuck in a continuous reset
state on power up, causing it to be inoperable and stop all communication.
Cause
The cause of the condition may be a software anomaly.
Correction
Action to be performed by dealer to confirm this service bulletin is applicable for the
above customer concern:
1. Verify the Image Processing Module is not communicating on all three CAN busses
(CAN1, CAN2, CAN8).
2. Verify for presence of 3 loss of Communication DTCs (U1614, U1615, U1616) set
by other modules against the Image Processing Unit.
3. If step (1) and (2) are both true, the issue may be resolved by resetting the power.
Either by disconnecting vehicle battery or disconnecting the fuse to the controller for
1 minute. The module should start communication once power is connected.
4. Update the K124 Image Processing Module with latest software and calibrations.
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.
• 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
Copyright 2021 General Motors LLC. All Rights Reserved.
•
•
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.
Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
Page 2
November, 2021
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
reprogramming the subject module with the
correct vehicle VIN and software and/or
calibrations.
Bulletin No.: 20-NA-178
•
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
Bulletin No.: 20-NA-178
November, 2021
Page 3
Important: If the vehicle VIN DOES NOT match, the
message below will be shown.
5877000
5644477
Page 4
November, 2021
Bulletin No.: 20-NA-178
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.
1. Reprogram the Image Processing Module. Refer to
K124 Image Processing Module: Programming
and Setup in SI.
Bulletin No.: 20-NA-178
November, 2021
Page 5
5644478
5431209
Page 6
November, 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.
2. 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
2886998*
Reprogram Image
processing Unit for
continuous reset with SPS
0.3 hr
Bulletin No.: 20-NA-178
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 SPS 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
3
Modified
Released September 09, 2020
May 14, 2021 – Added Additional Option RPO UGN, removed Europe from Involved
Region or Country section and updated programming procedure.
November 16, 2021 – Added DTCs to Subject line, updated the Involved Region or
Country section and updated programming Service Procedure.
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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