Good morning,
The fact that it moves perfectly forward tells me it is not an electronic issue.
The reverse is a mechanical application inside the transmission. It is the application of a clutch and a band.
Chances are one of them has failed and not allowing reverse. This will require removal of the transmission and internal inspection for no reverse.
https://www.2carpros.com/articles/automatic-transmission-problems
Roy
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Wednesday, October 20th, 2021 AT 2:22 AM