Passive Door Unlocking Inoperative and/or Enabling and Disabling of Passive Unlocking – 2019-2021 Buick Cadillac Chevrolet GMC

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Service Bulletin Bulletin No.: 18-NA-279
Date: May, 2021
INFORMATION
Subject: Information on Passive Door Unlocking Inoperative and/or Enabling and Disabling of
Passive Unlocking
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Buick
Enclave
2019
2021
— All All
Encore
Encore GX 2020
Envision 2019
LaCrosse 2019 2019
Cadillac
CT4
2020 2021
CT5
CT6 2019 2020
Escalade
Models
2019
XT4 2021
XT5
XT6 2020
Chevrolet
Bolt EV
2019 2019
Cruze
Volt
Silverado 1500
(New Model)
Blazer
2019
2021
Camaro
Malibu
Spark
Suburban
Tahoe
Trailblazer 2021
Traverse
2019
Trax
Silverado 2020 2021
GMC
Acadia 2020 2021
Yukon
2019
2021
Sierra 1500
(New Model) 2019
Sierra 2020 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.
Correction
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.
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

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