Hi,
Is the fluid clean and full? Have you tried to retrieve diagnostic trouble codes? There are a few different things that can be causing it.
I attached a picture below showing different components related to shifting.
Is the speedometer working properly? If it is, then the speed sensor isn't the issue. After looking at the attached picture, I hope you understand why I'm suggesting having the transmission scanned.
Let me know if you have questions.
Joe
Image (Click to make bigger)
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Tuesday, May 19th, 2020 AT 8:56 PM