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2006 - 2009 Cadillac XLR XLR-V: Service Bulletin: #16-NA-130: No Reverse, No Second After Upper Valve Body Replacement

#16-NA-130: No Reverse, No Second After Upper Valve Body Replacement - (Apr 27, 2016)

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:Engine:Transmission:
Cadillac XLR, XLR-V 2006 2009       Equipped with 6L45, 6L50, 6L80, 6L90 Automatic Transmission (RPOs MYA, MYB, MYC, MYD)
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


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.

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.


Location of the four post shown above.


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.


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.

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