First, I want to thank you for your service, we sincerely appreciate you. :) Lets see whats going on here. The first thing we need to do is run the codes to see what comes up here is a guide to help us get started. You can get a coder reader for about $20.00 from Amazon.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
Next here is the transmission wiring diagrams so we can see how the system works. There is a transmission control module I would try removing the electrical connector and check for corrosion on the terminals here is the location of the module as well.
Check out the diagrams (below). Please let us know what happens.
Cheers, Ken
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Sunday, August 26th, 2018 AT 12:33 PM