SB-16-NA-130

File in Section:
Service Bulletin
-
Bulletin No.:
16-NA-130
Date:
May, 2016
INFORMATION
Subject:
No Reverse, No Second After Upper Valve Body Replacement
Attention: This Bulletin also applies to any of the models that may be Export from North America
vehicles.
Brand:
Model:
Model Year:
VIN:
from
to
Cadillac
XLR, XLR-V
2006
2009
Cadillac
STS, STS-V
2006
2011
Cadillac
SRX
2007
2012
Cadillac
Escalade
Models
2007
2015
Cadillac
CTS
2008
2015
Cadillac
ATS
2013
2015
Chevrolet
Corvette
2006
2015
Chevrolet
Avalanche
2007
2013
Chevrolet
Silverado,
Suburban,
Tahoe
2007
2016
Chevrolet
Colorado
2015
2016
Chevrolet
Camaro
2010
2015
Chevrolet
Express
2010
2016
Chevrolet
Caprice
2011
2016
Chevrolet
Chevrolet
SS
2014
2016
GMC
Sierra,
Yukon
Models
2007
2016
GMC
Canyon
2015
2016
GMC
Savana
2010
2016
HUMMER
H2
2008
2011
Pontiac
G8
2008
2009
from
to
Engine:
Transmission:
Equipped with
6L45, 6L50,
6L80, 6L90
Automatic
Transmission
(RPOs MYA,
MYB,
MYC, MYD)
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.
Copyright 2016 General Motors LLC. All Rights Reserved.
Page 2
May, 2016
Correction
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.
Bulletin No.: 16-NA-130
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.
4498521
4498528
Location of the four post shown above.
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.
4498516
Version
1
Modified
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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