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From 1993 to 2008, the GM 4l60E transmission used a pressure switch manifold to tell the computer what gear was selected.  In this Tip Clip instructor Wayne Colonna gives a detailed technical overview of this component with some helpful info on diagnosing associated problems. Watch Now.



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4 replies to this post
  1. thank you for your video. i bought a rebuilt 4l60e of ebay and it would not shift. i spent many hours swapping solenoids an putting in my old valve body. i asked around about the pressure switch manifold and was told this would not cause this.my old one looked different from the bottom and i did not have new o-rings so i did not change it. when i finally did it shifted perfect. i never would have figured this out if not read where you told what this switch did. does the rebuilder have any way to test this switch or is he putting in used parts hoping the customer doesn’t get screwed. thanks Skip Porter

  2. I’m trying to control a 2008 transmission with a 2010 T42 TCM. The 08 4L60E has the pressure manifold assembly, and the 3-2 solenoid, external range switch. No external range switch.

    I need the 2010 PCM for a E67 with VVT, I tried paring it to a 2008 T42, but got codes U100 P0601.

    I’m hoping that I can simply use the 2010 TCM, with it wired like a 2008 TCM.

    The external range switch will send the needed signals will it not? I cant see what difference it will make having it infernal or external? Will the trans care if the pressure manifold signals are missing?

    Does the 3-2 timing solenoid mater?

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