Hello, I'm Danny.
The best thing for you to do first is perform a CAN scan. A CAN- Controller Area Network scan will test and retrieve all codes that are stored in your vehicles computer. This scan will test all systems on your vehicle including the transmission. Here is a tutorial showing how to perform this scan:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
Due to the numerous components in the transmission it could be numerous different things causing this issue. After you perform this scan get back to us with any and all fault codes and we can then properly diagnose all the issues with your vehicle including the transmission. Hope this helps and thanks for using 2CarPros.
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Tuesday, September 7th, 2021 AT 1:07 AM