16-NA-130

Bulletin No.:
Service Bulletin
Date:
16-NA-130
March, 2023
INFORMATION
Subject:
Brand:
No Reverse, No Second After Upper Valve Body Replacement
Model:
XLR, XLR-V
STS, STS-V
Cadillac
Chevrolet
SRX
Escalade Models
2007
to
Engine:
Transmission:
—
6L45, 6L50, 6L80,
6L90 Automatic
(RPOs MYA, MYB,
MYC, MYD)
2011
2012
2008
2013
Avalanche
2007
2013
Camaro
2010
2015
Caprice
2011
Chevrolet SS
2014
2015
2016
Colorado
2015
2022
Corvette
2006
2015
Express
2010
2023
Silverado
2007
2018
Silverado 1500
(New Model)
2019
2019
Silverado 1500
2020
2021
Silverado 1500
New (RPO J22,
VIN Digit 5 = A / D)
2022
2022
Silverado 2500/3500
2014
2019
Silverado
2500HD/3500HD
2020
2023
2007
2020
Canyon
2015
2022
Savana
2010
2023
—
Sierra
2007
2018
Sierra 1500 (New Model)
2019
2019
Sierra 1500
2020
2021
Sierra 1500 New (RPO
J22, VIN Digit 5 = H / U)
2022
2022
Sierra 2500/3500
2014
2019
Sierra 2500HD/3500HD
2020
2023
Yukon Models
2007
2020
H2
2008
2011
Copyright 2023 General Motors LLC. All Rights Reserved.
VIN:
from
2009
ATS
Tahoe
HUMMER
2006
to
CTS
Suburban
GMC
Model Year:
from
—
Page 2
March, 2023
Brand:
Model:
Pontiac
G8
Bulletin No.: 16-NA-130
Model Year:
from
to
2008
2009
VIN:
from
to
Engine:
Transmission:
Involved Region or Country
North America, Middle East
Condition
After installation of a replacement upper valve body, the transmission may have no
Reverse and no 2nd gear. In some cases the Input Speed Sensor (ISS) signal and the
Output Speed Sensor (OSS) signal may also be missing. Please note this bulletin only
addresses these conditions after the installation of a replacement upper valve body.
Cause
This condition may be caused by the installation of the incorrect upper valve body.
Correction
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.
Upper valve bodies are unique by transmission RPO.
Each upper valve body has four posts labeled A, B, C
and D on the top side of the upper valve body. Inspect
the upper valve body as shown below to determine the
correct RPO usage.
4498516
The post corresponding to the correct RPO will be
milled off. In this case the “C” post is milled indicating
that this is an MYC upper valve body. A milled “A” post
indicates MYA, a milled “B” indicates MYB, a milled “C”
indicates MYC and a milled “D” indicates MYD.
4498528
Location of the four post shown above.
4498521
Bulletin No.: 16-NA-130
March, 2023
Page 3
The oil passage holes that feed the center support and
Low and Reverse Clutch and 2-6 Clutch contained
within the center support vary location by transmission
and corresponding upper valve body. The ISS and OSS
mounting locations also vary by transmission. The
incorrect valve body does not properly locate the oil
feed holes and speed sensors.
Version
2
Modified
Released April 27, 2016
Revised March 02, 2023 – Removed the Attention statement, added the 2017-2023
Model Years to certain Chevrolet and GMC models, added Involved Region or Country
section to table and an Important statement.
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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