TSB's

2009 GM valve body changes

For the 2009 model year, there are several changes to the 4L60E, 4L65E and 4L70E transmissions. This affects 2009 Chevrolet Avalanche, Colorado, Express, Silverado, Tahoe, TrailBlazer and TrailBlazer SS; GMC Canyon, Envoy, Envoy Denali, Savanna, Sierra, Yukon and Saab 9-7X models.

The valve body casting has been changed and will not back-service due to the removal of the pressure switch manifold (PSM) and the control solenoid and valve line up.

For 2009, the pressure switch manifold (PSM, picured) has been eliminated in favor of a new internal mode switch (IMS).
<p>For 2009, the pressure switch manifold (PSM, picured) has been eliminated in favor of a new internal mode switch (IMS).</p>

A new internal mode switch (IMS) has been added and the PSM has been deleted. Do not reuse the roll pin that retains the IMS to the manual shaft. Do not remove the C-clip from the IMS (this will damage the part). The manual shaft has been redesigned to accommodate the IMS.

The new actuator rod (1) features a flat to accommodate the new IMS. The IMS is pictured at top right (2). The manual shaft has also been redesigned for the IMS (3).
<p>The new actuator rod (1) features a flat to accommodate the new IMS. The IMS is pictured at top right (2). The manual shaft has also been redesigned for the IMS (3).</p>

The actuator rod is a new design and will back-service. It features a flat on the rod to accommodate the IMS.

Both the 20-way connector (1) and the six-pin connector (3) for the IMS are blue in color. The Temperature sensor (2) is now in the harness with a gray connector.
<p>Both the 20-way connector (1) and the six-pin connector (3) for the IMS are blue in color. The Temperature sensor (2) is now in the harness with a gray connector.</p>

The wiring harness has been changed and now has the temperature sensor in the harness with a gray connector. Both the 20-way connector and the six-pin connector for the IMS are now blue in color.

The following are new DTCs that have been added for the IMS:

* P1820 (internal mode switch A circuit low voltage).

* P1822 (internal mode switch B circuit high voltage).

* P1823 (internal mode switch P circuit low voltage).

* P1825 (internal mode switch invalid range).

* P1826 (internal mode switch C circuit high voltage).

* P1915 (internal mode switch does not indicate Park/Neutral (P/N) during start).

Tags: General Motors  GM 
Post a comment
 

Comments (0)

 

Post a Comment

Submit
Subscribe Today

Subscribe to Auto Service Professional

Sign up for a FREE subscription to Auto Service Professional magazine

Subscribe