NHTSA ID Number: 10245200
Manufacturer Communication Number: 22-NA-225
TSB/Document Date: 2023-11-10
Summary
This information bulletin advises the technician the difference between a welch cap leak and the output seal of the t-case or transmission leaking ATF, causing the customer concern of a Red Fluid Leak from Center of Vehicle Located by Rear of Transmission or Transfer Case Area.
Bulletin No.:
Service Bulletin
Date:
22-NA-225
October, 2023
INFORMATION
Subject:
Information on Red Fluid Leak from Center of Vehicle Located by the Rear of the
Transmission or Transfer Case Area
Brand:
Model:
Escalade
Model Year:
from
to
2015
2024
2015
2024
Silverado 1500
2015
2018
Silverado 1500
(New Model)
2019
2019
2022
2022
Colorado
Express
Silverado LD
Silverado 1500 - LTD
(RPO J21, VIN Digit
5 = W/Y)
Silverado 1500 - New
(RPO J22, VIN Digit
5 = A)
Silverado 1500
2023
Silverado
2500HD/3500HD
2020
Suburban
Tahoe
Canyon
2024
2015
2015
2024
Sierra 1500
2014
2018
Sierra 1500
(New Model)
2019
2019
2020
2021
2022
2022
Savanna
Sierra Limited
Sierra 1500
GMC
Sierra 1500 - Limited
(RPO J21, VIN Digit
5 = 8/9)
Sierra 1500 - New
(RPO J22, VIN Digit
5 = H/U)
Sierra 1500
2023
Sierra
2500HD/3500HD
2015
Yukon Models
Copyright 2023 General Motors LLC. All Rights Reserved.
2024
VIN:
from
to
Engine:
Page 2
October, 2023
Bulletin No.: 22-NA-225
Involved Region or Country
North America, Middle East, Europe
Additional Options (RPOs)
F48: CHASSIS DRIVE LINE-ALL WHEEL DRIVE (AWD)/FOUR WHEEL DRIVE(4WD),
DRIVER SELECT
Condition
Some customers may comment that a red fluid is seen in the middle of the vehicle.
Some customers may also comment that a red fluid is seen coming from the rear of the
transmission/transfer case area.
Important: Utilizing mineral spirits or equivalent, clean the area of concern and inspect
to verify if the leak is from the welch plug or from the transmission/transfer case
output seal.
Verify the ATF leak is either from the Transfer case/transmission rear output seal leak or
the prop shaft slip yoke welch plug leak:
Information
6186773
1. Visually observe the output seal and boot area for ATF leak.
6186771
Bulletin No.: 22-NA-225
October, 2023
Page 3
2. If the seal/boot area appear to be dry, inspect the welch plug area for ATF.
– If the welch plug is the source of the leak. Go to step 4.
– If the output seal is the source of the leak, replace the output seal. Refer to
Propeller Shaft Front Slip Yoke Replacement in SI and no more work is required.
3. If both the seal/boot and the welch plug are wet with ATF, therefore unclear, dry the
area with a soft rag and do a series of short drives (around the block) to initiate the
leak. Go back to step 1.
4. If it has been determined that the welch plug is leaking, replace the propeller shaft
front slip yoke. Propeller Shaft Front Slip Yoke Replacement in SI.
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.
Additional Information
Potentially affected vehicles that could have this
condition are:
• MST (Colorado/Canyon) – all except 2wd with 8
speed transmission
• G-van – all except 8 speed transmission
• T1 LD – all except 2wd with 8 speed transmission
• T1 SUV/T1 HD – all 8 speed transmissions do not
use slip yokes with welch plugs
A convoluted boot is used to protect the splines from
the environment.
Version
2
Modified
Released November 09, 2022
Revised October 16, 2023 - Updated Subject, Added 2024 to Model Years, Added
Important Statement in Information section, Added Additional Keyword section.
Addition Keywords: T-Case, transfer case, Slip Yoke,
welch plug leak, Transmission leak, Fluid Leak
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-225
Replacement Service Bulletin Number:
MFR Communication Date: 2023-10-17
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT
MFR Component System:
MFR Component Subsystem:
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