Lane Keep Assist Unintentionally Moves Vehicle Slightly Left or Right – 2019-2020 Buick Envision

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Copyright 2020 General Motors LLC. All Rights Reserved.
Service Bulletin Bulletin No.: 20-NA-180
Date: October, 2020
TECHNICAL
Subject: Lane Keep Assist Unintentionally Moves Vehicle Slightly Left or Right
Brand: Model:
Model Year: VIN: Engine: Transmission:
from to from to
Buick Envision 2019 2020
Involved Region or Country United States and Canada
Additional Options (RPOs)
Condition
Some customers may comment on while driving in the center of the lane (between the
lane lines) they feel the lane keep assist activating unintentionally moving the vehicle to
the left or the right.
Cause The cause of the condition may be the calibrations in vehicles are not optimized or tuned.
Correction
Reprogram the vehicle with the updated Active Safety Control Module for Lane Keep
Assist calibration to reduce the asymmetry. The updated calibration calculates the
distance from the left and the right side of the lane correctly.
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 12 V jumper or booster pack
disconnected from the AC voltage supply. DO
NOTconnect a battery charger.
• Turn OFF or disable systems that may put a load
on the vehicles battery such as; interior lights,
exterior lights (including daytime running lights),
HVAC, radio, etc.
• Clear DTCs after programming is complete.
Clearing powertrain DTCs will set the Inspection/
Maintenance (I/M) system status indicators to NO.
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Bulletin No.: 20-NA-180 October, 2020 Page 3
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. Reprogram the Active Safety Control Module.
Refer to K124 Active Safety Control Module:
Programming and Setup in SI.
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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 SPS Warranty Claim Code on job card for
warranty transaction submission.
Bulletin No.: 20-NA-180 October, 2020 Page 5
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
2810435* Active Safety Control Module Reprogramming with SPS Use Published Labor
Operation Time
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.
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 September 09, 2020
Revised October 09, 2020 – Updated Correction, Service Procedure, and Labor
Operation with correct module to program and updated the programming information in
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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