NHTSA ID Number: 10252778
Manufacturer Communication Number: 21-NA-281
TSB/Document Date: 2024-04-05
Summary
This service bulletin provides diagnostic information for technicians in cases of an ETRS system fault or a no start condition - If the vehicle needs to be moved, it is recommended to use wheel dollies, tire skates or the NEW Manual Park Release tool DT-52910.
Bulletin No.:
Service Bulletin
Date:
21-NA-281
March, 2024
INFORMATION
Subject:
Diagnostic Tip – Transmission Neutral Service Mode
This bulletin replaces PIT5764B. Please discard PIT5764B.
Brand:
Model:
Model Year:
from
to
2021
2024
Silverado 1500 - New
(RPO J22, VIN Digit
12 = 5 or greater)
2022
2022
Silverado 1500
2023
VIN:
from
to
Transmission:
(Automatic)
CT4
Cadillac
CT5
Escalade Models
Suburban
Tahoe
2021
Sierra 1500 - New
(RPO J22, VIN Digit
12 = 5 or greater)
2022
Sierra 1500
2023
Yukon Models
2021
2024
MQA, MQC, MHO,
MHU, MHS,
MQ2, MHX
2022
2024
Involved Region or Country
North America, Europe, Israel, Bolivia (West), Chile (West), Peru (West), Japan, Cadillac
Korea (South Korea), GM Korea Company, Thailand (ASEAN), Australia/New Zealand
Condition
Certain service procedures or scenarios may require the transmission to be shifted into
Neutral so that the vehicle can be moved or to complete a repair.
Diagnostic Information
Vehicles equipped with an internal Electronic Transmission Range Select (ETRS) system
require hydraulic pressure to disengage the park mechanism. Please follow the
information listed below when trying to place the transmission into Neutral.
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.
Correction
In cases where the engine can be started - Refer to the
Neutral Service Mode in SI.
Copyright 2024 General Motors LLC. All Rights Reserved.
Page 2
March, 2024
Bulletin No.: 21-NA-281
In cases of an ETRS system fault or a no start condition
- If the vehicle needs to be moved, it is recommended
to use wheel dollies, tire skates (example shown
above) or the NEW Manual Park Release tool
DT-52910 shown above (1). The manual park release
tool is available through the GM Special Service Tools
website. This new tool will allow the transmission to be
manually shifted to neutral, see example SI doc ID
5620825. The manual park release tool can be installed
to temporarily shift the vehicle into Neutral when the
engine is not running.
Warning: The transmission will be placed in
N (Neutral) when the manual park release is pulled.
The vehicle can roll on you or others could be
injured. Ensure the vehicle is on level ground,
parking brake applied, and wheels blocked prior to
installation of the manual park release.
5641294
Warning: If fuel system is opened the fuel pump
should be disabled using the Fuel Pressure Relief,
Alternate Method by the removing the B+ fuel pump
control module fuse. Using the Fuel Pressure
Relief, Scan Tool Method will allow the fuel pump to
build pressure if the ignition is placed to run. See
Fuel Pressure Relief in Service Information for
complete instructions.
Caution: If the manual park release is pulled while the
vehicle is on or if the ignition is turned on while the
manual park release is pulled, the DIC will display a
message to service the transmission.
Caution: The latching mechanism in the manual park
release lever will release if the vehicle is started and
placed in Park. An attempt to override this function or
use of an un-approved tool may cause internal damage
to the transmission.
5710077
Version
5
Modified
Released November 30, 2021
Revised May 24, 2022 - Added 2022 Silverado and Sierra 1500 to Model section.
Revised January 23, 2023 - Added 2023 to Model Year.
Revised April 21, 2023 - Updated the Involved Region or Countries section.
Revised March 25, 2023 - Added 2024 to Model Year.
Additional SI Keywords: tow, towing, haul, wrecker,
truck
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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TSB/Document ID: 21-NA-281
Replacement Service Bulletin Number:
MFR Communication Date: 2024-03-25
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
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