18NA279

Service Bulletin
Bulletin No.:
18-NA-279
Date:
May, 2021
INFORMATION
Subject:
Brand:
Information on Passive Door Unlocking Inoperative and/or Enabling and Disabling of
Passive Unlocking
Model:
Enclave
Encore
Buick
VIN:
to
Envision
2019
LaCrosse
2019
2019
2020
2021
2019
2020
CT6
to
Engine:
Transmission:
All
All
2021
2020
CT5
from
2019
Encore GX
CT4
Cadillac
Model Year:
from
Escalade
Models
XT4
2019
2021
XT5
XT6
2020
Bolt EV
Cruze
Volt
2019
2019
—
Silverado 1500
(New Model)
Blazer
Camaro
Chevrolet
Malibu
Spark
2019
Suburban
2021
Tahoe
Trailblazer
Traverse
Trax
2021
2019
Silverado
2020
2021
Acadia
2020
2021
Yukon
GMC
2021
Sierra 1500
(New Model)
2019
Sierra
2020
Copyright 2021 General Motors LLC. All Rights Reserved.
2019
2021
Page 2
May, 2021
Bulletin No.: 18-NA-279
Involved Region or Country
North America, Chile, Colombia, Ecuador, Peru, Europe, Israel, Middle East, Cadillac
Korea (South Korea), GM Korea Company, Uzbekistan, China, Japan, Malaysia, Vietnam
Condition
Some customers may comment that the passive door unlocking feature is inoperative
when pressing the button on any door handle or tailgate release handle. They may also
comment that all turn signals flash 4 times quickly when the button is pressed.
When using the following procedures, the owner can cycle between Passive Unlocking
Enabled to Passive Unlocking Disabled, and back.
Once any individual FOB is used to disable Passive Unlocking, Passive Unlocking will be
disabled for ALL FOBs.
Additionally, as shown below, some listed vehicles have “Passive Door Unlock” as a
Vehicle personalization feature via the center stack. When selected, this option applies to
ALL FOBs.
Correction
5420080
Bulletin No.: 18-NA-279
May, 2021
Page 3
Service Procedure
With the vehicle off:
Starting State
Do:
Results in:
Passive Unlocking is
Enabled
Press and Hold both Lock and Unlock FOB
buttons for 3 seconds.
Turn Signals flash 4 times and Passive Unlocking is
Disabled.
When the button on the door handle is pressed, the
Turn Signals flash 4 times and the doors remain
locked.
Passive Unlocking is
Disabled
Press and Hold both Lock and Unlock FOB
buttons for 3 seconds.
Turn Signals flash 2 times and Passive Unlocking is
Enabled.
When the button on the door handle is pressed, the
door(s) will unlock.
Note: If it is necessary to contact the Technical
Assistance Center (TAC) for this issue, please obtain
the following information from the customer prior to
calling:
How long driver had vehicle?
Was issue there from beginning of vehicle delivery or
occurred after?
Where does the driver keep the FOB? Front pocket,
rear pocket, etc.
Single driver or multiple drivers for vehicle?
Does customer remember pressing both lock and
unlock on FOB at the same time?
Has anyone else used the FOB?
Customer Information
Please share this information with the customer,
including a copy of this bulletin.
Version
5
Modified
Released September 13, 2018
May 29, 2019 – Added the Chevrolet Blazer and Cadillac XT6 Models, updated the
Involved Region or Country section and added a Note to the Results in section.
October 10, 2019 – Added Models, 2020 Model Year, removed the Opel Karl model,
updated the Involved Region or Country section, removed RPO information, added
Correction statements and graphic and removed the Note in the Results in section.
January 22, 2020 – Corrected Flash Information in Results in section.
May 12, 2021 – Added the Buick Encore GX and Chevrolet Trailblazer models, 2021
Model Year to certain models, updated the Involved Region or Country section and added
several Additional SI Keywords.
Additional SI Keywords: disable, enable, entry, flashes, FOBs, four, free, gate, hand, hands, hands-free, handsfree,
inop, key, keyless, left, lift, liftgate, locking, passenger, PEPS, right, tail, transmitter, door, flash, light, lights, lock
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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