21-NA-041

Service Bulletin
Bulletin No.:
21-NA-041
Date:
July, 2022
TECHNICAL
Subject:
Intermittent Shift Flare 2-3 or 3-4 While Driving
Brand:
Model:
Chevrolet
Holden
Model Year:
VIN:
Engine:
Transmission:
2022
LYX
MNH
2020
-
-
from
to
Equinox
2018
Equinox
2018
from
to
Involved Region or Country
North America, Middle East, Israel, Argentina, Brazil, Chile, Columbia, Ecuador,
Paraguay, Peru, Uruguay, GM Korea Company, China, Thailand, Australia, New Zealand,
Egypt and Africa.
Condition
Some customers may comment on an intermittent shift flare 2-3 or 3-4 while driving.
Some technicians may find during diagnosis, the 2-3 or 3-4 shift flare only occurs during
the first shift event after an extended vehicle shut down (4 hours).
Cause
If SI diagnostics are not able to find the cause of the concern and the transmission fluid
level is good, not distressed or shows signs of metal. This condition may be caused by
the clutch, has not completed learning its proper fill capacity.
Correction
This condition may be corrected by warming up the transmission to operating temp. and
driving the vehicle for 15 continuous minutes in 3rd gear. This would allow the clutch to
learn its proper fill value.
If this was not successful or if conditions may not allow the 15 continuous minute drive in
3rd gear, then the technician should duplicate the condition while recording the event with
GDS. U.S. dealers should then open a TAC case through the portal and attach the
session log to the case and wait for direction from TAC. Canadian dealers should first
email the GDS2 session log to Canadian TAC (refer to PIP4902 for procedure), and then
place a call to TAC.
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.
Parts Information
No parts are required for this repair.
Copyright 2022 General Motors LLC. All Rights Reserved.
Page 2
July, 2022
Bulletin No.: 21-NA-041
Warranty Information
For vehicles repaired under the Powertrain coverage,
use the following labor operation. Reference the
Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
Labor Operation
Description
Labor Time
8481948*
Clutch Learn Fill Procedure
0.6 hr
Add
TAC Involvement
0.6 hr
*This is a unique Labor Operation for Bulletin use only.
Version
3
Modified
Released February 22, 2021
Revised October 01, 2021 - Added 2021 Model Year.
Revised June 29, 2022 - Added 2022 Model Year.
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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