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If you think about it, the TCU can only throw codes related to sensors etc that are showing values out of range.
Presuming we are correct and it is actually one or both of your One Way Clutches [spragues] that are kaput, this would be a mechanical fault, and there probably is no voltage signal that reacts to it.
What I'm saying is, it could be kaput and not throw a code.
It is sensible to try all other cheaper avenues first such as additives and so on, but probably you will have to bite the bullet and rebuild it.
Joe
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