NHTSA ID Number: 10228909
Manufacturer Communication Number: 22-NA-182
TSB/Document Date: 2023-01-06
Summary
This informational bulletin advises the tech to check if the trans cooler lines are twisted which may cause the customers concern.
Bulletin No.:
Service Bulletin
Date:
22-NA-182
December, 2022
INFORMATION
Subject:
Information on 6L80 6L90 8L90 10L80 10L90 10L000 Equipped Vehicles With A Harsh
Shift, Shudder, Surge, Stall, Neutral/Flare, Transmission Overheating and/or High
Transmission Fluid Temperature
This bulletin replaces PIP5792E. Please discard PIP5792E.
2023
All
MHS MHO MQC
2021
All
Except L3B
MHS, MHT, MQB
MQC MQE MYC
2022
All
Except L3B
MHS MHT MQB
MQC MQE MYC
Silverado 1500 New
(RPO J22, VIN Digit
5 = A / D)
2022
All
Except L3B
MHS MHT MQB
MQC MQE
Silverado
2500HD 3500HD
2021
All
MGM MGU MYD
Suburban
2021
All
MHS MQC
Tahoe
2021
All
MHS MQC
Sierra 1500
2021
All
Except L3B
MHS MHT MQB
MQC MQE MYC
Sierra 1500 Limited
(RPO J21, VIN Digit
5 = 8 / 9)
2022
All
Except L3B
MHS MHT MQB
MQC MQE MYC
Sierra 1500 New
(RPO J22, VIN Digit
5 = H / U)
2022
All
Except L3B
MHS MHT MQB
MQC MQE MYC
Sierra
2500HD 3500HD
2021
All
MGM MGU MYD
Yukon
2021
All
MHS MQC
Brand:
Model:
Model Year:
from
to
Escalade
2021
Silverado 1500
2021
Silverado 1500 LTD
(RPO J21, VIN Digit
5 = W / Y)
Copyright 2022 General Motors
LLC. All Rights Reserved.
2023
2021
2023
VIN:
from
to
Page 2
December, 2022
Bulletin No.: 22-NA-182
Involved Region or Country
North America, Uzbekistan, Middle East, Brazil (Mercosur), Colombia (West), Ecuador
(West), Peru (West), Japan, Cadillac Korea (South Korea), Thailand (ASEAN), Europe,
Australia, New Zealand.
Condition
Some customers may comment on one or more of the following before or after the
transmission has been overhauled:
• Harsh shifting
• Shudder
• Surging
• Stalling
• Neutral/Flare
• Transmission overheating
Some customers may also comment on above normal transmission fluid temperature.
Cause
This condition may be caused by a twisted cooler line on low mileage vehicles.
Note: A twisted cooler line may cause DTC P27EC to set in the TCM on ETRS
transmissions. (RPO MHS MQC).
5758376
Inspect for a twisted cooler line, example shown in the graphic above.
In some cases, it may be necessary to remove the under body panels in order to clearly
see the cooler lines.
• If the cooler line is twisted, disconnect the cooler line from the transmission auxiliary
cooler and untwist it, then reconnect the cooler line.
• If the cooler line remains misshaped after untwisting, the cooler line should be
replaced then check the transmission fluid level following SI. Add fluid if needed.
• If no concerns are found with the rubber line being misshaped, check the transmission
fluid level following SI. Add fluid if needed.
The Thermal Bypass Valve (TBV) may be the cause of the overheat if a cooler line is not
twisted or misshaped. The TBV will open at the following temperatures for the models
listed in this TSB. 6 Speed (6L80, 6L90) - 158F (70C) - TBV is external to the
transmission 8 Speed (8L90) - 194F (90C) – TBV is external to the transmission 10
Speed (10L80, 10L90, 10L1000) – 143F (61C) – TBV is within the valve body on all listed
applications expect those equipped with 3.0 (LM2) Diesel. On the LM2 Diesel the TBV is
external to the transmission.
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.
Bulletin No.: 22-NA-182
December, 2022
Page 3
Version
2
Modified
Released September 06, 2022
Revised December 19, 2022 - Added Neutral/Flare to Subject and Condition section.
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: 22-NA-182
Replacement Service Bulletin Number:
MFR Communication Date: 2022-12-20
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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