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· Super Moderator
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Personally, I would not have thought a little ATF would be a problem on the connector. It has good dielectric, lubricating and anti-corrosion properties. Everything looks pretty shiny and clean in there. You could try some electrical cleaner to remove it and see if the problem changes. What code do you get?

There is also a note in the service manual when replacing the solenoid

Important: It is recommended that transmission adaptive pressure (TAP) information be reset.

Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.
Perhaps the connector wiring diagram would help if you think it is a wiring issue

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