NHTSA ID Number: 10249743
Manufacturer Communication Number: 22-NA-246
TSB/Document Date: 2024-02-06
Summary
This service bulletin advises the technician that the possible cause may not be from a faulty clutch piston or extension housing and to perform testing on transmission for other possible issues, but it still may be possible on high mileage vehicles that orifices in housing may have come dislodged, causing the same customer concern.
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TSB/Document ID: 22-NA-246
Replacement Service Bulletin Number:
MFR Communication Date: 2024-01-18
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: POWER TRAIN
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Bulletin No.:
Service Bulletin
Date:
22-NA-246
January, 2024
INFORMATION
Subject:
Brand:
Information on Unnecessary Replacement of Extension Housing and 1-2-3-4-5-REV
Clutch Piston Assembly for 8L45, 8L90 Automatic Transmissions
Model:
ATS
Model Year:
from
to
2016
2019
VIN:
from
to
Engine:
Transmission:
M5N, M5T, M5U
CT4
2020
2023
M5N
CT6
2016
2018
M5N, M5X
CTS
2016
2019
M5N, M5U
Escalade Models
2015
2017
M5U
Camaro
2016
2023
M5T, M5U
Colorado
2017
2022
M5T, M5U
Corvette
2015
2019
M5U
Express
2017
2023
M5U, MQD
Silverado
2015
2018
M5U, M5X
Silverado 1500 (New
Model)
2019
2019
2020
2021
—
—
—
Silverado LD
Chevrolet
Silverado 1500
Silverado 1500 - LTD
(RPO J21, VIN Digit
5 = W/Y)
Silverado 1500 - New
(RPO J22, VIN Digit
5 = A/D)
Silverado 1500
Suburban
Tahoe
Copyright 2024 General Motors LLC. All Rights Reserved.
MQE,
M5U, M5X
2022
2022
2023
2023
2015
2017
M5U
Page 2
Brand:
January, 2024
Model:
Canyon
Savana
Model Year:
from
2017
to
Bulletin No.: 22-NA-246
VIN:
from
to
Engine:
2022
M5T
2023
M5U, MQD
M5U, M5X
Sierra
2015
2018
Sierra 1500 (New
Model)
2019
2019
2020
2021
Sierra Limited
GMC
Sierra 1500
Sierra 1500 - Limited
(RPO J21, VIN Digit
5 = 8/9)
2022
Sierra 1500
2023
2023
Yukon Models
2015
2017
Involved Region or Country
Condition
—
—
MQE,
M5U, M5X
2022
Sierra 1500 - New
(RPO J22, VIN Digit
5 = H/U)
—
M5U
North America, Middle East
Some technicians may see normal witness marks that lead them to condemn the
extension housing and 1-2-3-4-5-REV clutch piston assembly.
Important: Several of these components were returned for an engineering investigation
into the witness marks found on the extension housing and the 1-2-3-4-5-Rev clutch
piston assembly. Engineering has verified that components with these marks are not the
cause of harsh shifting concerns. The components should not be replaced due to the
witness marks. The 1-2-3-4-5-REV clutch piston is an applied clutch in Park, Neutral,
Reverse, and the 1st, 2nd, 3rd, 4th, and 5th gear ranges.
Although these components should not be replaced for these witness marks,
another concern was found during the investigation with the components
returned from transmissions that had accumulated higher mileage.
This condition may apply to high mileage vehicles where it is possible to find one or both
orifices missing in the 1-2-3-4-5-REV clutch piston.
Cause
6201397
The orifices are normally staked into the two passages and may become dislodged
during time.
Bulletin No.: 22-NA-246
January, 2024
Page 3
6204833
Extension housing bore showing witness marks related to the O-ring seal from the 1-2-34-5-REV clutch piston. These two witness marks are always located in the same general
area, almost directly across from the fluid entry ports into the extension housing.
6201402
Page 4
January, 2024
Bulletin No.: 22-NA-246
The extension housing should not be replaced if witness marks are left by the piston
assembly.
– If either of the orifices have become dislodged, the extension housing and
1-2-3-4-5-REV piston assembly will require replacement.
6204566
This triangle shaped boss on the 1-2-3-4-5-REV clutch piston acts as a stop, to not allow
the piston to rotate when engaged. Over time, the boss will become polished on the side
and matching marks will be in the area on the extension housing. Engineering has
investigated and confirmed that the O-ring and boss markings have no ill effect on
transmission shift quality.
Note: Technicians should always road test vehicle in the same manner that the customer
is defining in their concern when it can be done safely and in accordance with all State/
Provincial and Federal vehicle operating laws and within the speed limit as allotted by
road conditions
Information
If the technician can duplicate the concern, an initial inspection of the vehicle should be
performed first.
– Once the technician has verified there are no visible concerns or fluid leaks found,
check service information (SI) for any bulletins on the concern:
• Bulletin 22-NA-182 refers to possible twisted cooler lines that can cause a harsh shift
concern.
• Bulletin 16-NA-361 addresses customer concerns with an initial harsh 1-2 shift after
the vehicle has sat for at least four hours.
• Bulletin 22-NA-122 should also be reviewed for description and operation of the
transmission.
If the technician cannot identify any obvious causes of the customers concern, the next
step will be to verify the transmission fluid level is as specified in the service information,
making sure to have the vehicle at the correct temperature according to the procedure
outlined in SI.
If the fluid level is correct, the technician should remove the transmission pan and inspect
for debris in the fluid and on the magnets.
If the technician finds excessive debris on the magnets, in the fluid, or signs of
overheating, the transmission should be torn down and inspected to identify the cause.
⇒ During tear down and inspection, clutch pack clearance should be measured
and adjusted according to SI specifications. If needed, inspect the steels for
excessive and uneven wear and replace as needed.
Concerns related to a harsh or firm garage shift; the transmission endplay should be
inspected and brought down as close to the tight end of the range, generally between
0.008”-0.012” should be acceptable.
If there are signs of overheating, the technician should verify the TBV valve operation
using a laser thermometer to measure inlet and outlet temperatures of the cooler by
measuring the lines at different locations.
If no debris is found, the transmission valve body should be replaced.
Bulletin No.: 22-NA-246
January, 2024
Page 5
Bulletin 16-NA-019 should be followed to perform the driving learn of the clutches, prior to
any further diagnostic evaluation being performed.
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.
Version
2
Modified
Released December 05, 2022
Revised January 18, 2024 – Added the 2023 Model Year to Applicable Models and the
2023 Silverado 1500, Sierra 1500 models.
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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