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Take a look at the third link I listed above. There's a lot going on with 4l80E's. The info is very in-depth. My quick review, I would look at page 122 after all the simple battery and grounds inputs are met. Good luck.
Simple when it all works, CAMO
Here's a couple of service manuals that may help.
https://shop.ukrtrans.biz/wp-content/uploads/catalogs/4L60E_80E_CODE_BOOK.pdf
https://www.logsa.army.mil/psmag/archives/PS2015/746/746-16-18.pdf
https://www.steelsoldiers.com/attachment.php?attachmentid=678658&d=1493698092
Lots of other...
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