Good morning,
It sounds like you have a leak and the fluid is going to the back of the car.
Did you verify the fluid level?
As far as no reverse, that is mechanical not electronic. If the fluid level is good and the filter is not clogged, it is an internal failure.
https://www.2carpros.com/articles/automatic-transmission-problems
I would start by changing the fluid and filter. See if there is any metal in the fluid or the magnet in the pan.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Are there any codes stored? I attached a flow chart for no reverse as well.
Roy
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Wednesday, October 21st, 2020 AT 9:05 AM