21-NA-228

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Bulletin No.:
Service Bulletin
Date:
21-NA-228
November, 2023
TECHNICAL
Subject:
Brand:
Chevrolet
GMC
Full Size Trucks Idle Time-out Disable
Model:
Model Year:
from
to
Silverado 1500
(New Model)
2019
2019
Silverado 1500
2020
2021
Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W / Y)
2022
2022
Silverado 1500 New
(RPO J22, VIN Digit
5 = A / D)
2022
2022
Silverado 1500
2023
2024
Silverado 2500/3500
2019
2024
Sierra 1500
(New Model)
2019
2019
Sierra 1500
2020
2021
Sierra 1500 Limited
(RPO J21, VIN Digit
5 = 8 / 9)
2022
2022
Sierra 1500 New
(RPO J22, VIN Digit
5=H/U
2022
2022
Sierra 1500
2023
2024
Sierra 2500/3500
2019
2024
VIN:
from
Engine:
Transmission:
to
Involved Region or Country
North America, Middle East, Israel, Palestine
Additional Options (RPOs)
BTM
Condition
Some customers may comment that currently if the vehicle is left parked and running with
the RKE transmitter outside the vehicle, it will continue to run for up to half an hour. If the
vehicle is left parked and running with the RKE transmitter inside the vehicle, it will
continue to run for up to an hour.
Cause
This condition is a normal function of vehicles equipped with passive entry passive start
(PEPS). GM PEPS vehicles were designed with an idle time-out.
Correction
In certain situations, the customer will request that this feature be turned off because they
need to extend their idle time. A calibration is available to eliminate the idle time out
feature. Contact the Techline Customer Support Center (TCSC) to see if disabling this
feature is possible for the specific vehicle.
Note: This is a customer pay repair. The vehicle owner is responsible to be aware of any
local ordinances that restrict prolong idling.
Reprogram the BCM (Body Control Module) to update.
Important: If this calibration is installed, the dealer will need to print the Owner’s
Agreement Statement in the Customer Information section of this bulletin and put it with
the Owner’s Manual.
Copyright 2023 General Motors LLC. All Rights Reserved.
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Page 2
Customer Information
November, 2023
Bulletin No.: 21-NA-228
When the vehicle was produced, it came with the auto-shutdown feature enabled. If you
are not the primary owner of your vehicle, please note that this feature may have been
disabled by a previous owner. The vehicle owner is responsible for being aware of and
complying with any local ordinances that may restrict prolonged idling. The vehicle owner
can have this feature re-enabled at owner cost at any GM service center.
Service Procedure
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.
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
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
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.
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.
• 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.
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Bulletin No.: 21-NA-228
November, 2023
Page 3
Caution: Be sure the VIN selected in the drop down
menu (1) is the same as the vehicle connected (2)
before beginning programming.
5743643
Important: If the vehicle VIN DOES NOT match, the
message below will be shown
5877000
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Page 4
November, 2023
Bulletin No.: 21-NA-228
5644477
Important: Techline Connect screens shown above.
Important: If the same calibration/software warning is
noted on the TLC 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 section of the bulletin.
1. Reprogram the Body Control Module. Refer to K9
Body Control Module: Programming and Setup in
the Service Manual.
Version
6
Modified
Released October 19, 2021
Revised February 04, 2022 – Updated Cause, updated and added note to Correction,
added Customer Information, updated programming procedure in Service Procedure, and
removed Warranty Information.
Revised December 15, 2022 – Added 2023 Model Year trucks.
Revised September 26, 2023 – Added Model Year 2022 J22 LD and 2024 Light Duty
and HD.
Revised October 27, 2023 – Added 2023 Model Year Silverado/Sierra.
Revised November 01, 2023 – Removed Warranty Claim Code information.
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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