Hi,
Does the engine seem to be running correctly? As far as codes are concerned, did you scan the can-bus? CAN stands for controller area network. Basically, the different computers/modules on the vehicle are tied together via a few wires so they can communicate with each other. If you used a traditional scan tool, it may not have been able to read transmission codes.
Here is a link showing how it's done:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
Also, have you checked the transmission fluid level and condition? If not, I would recommend doing that as well.
I attached the directions below for the fluid test. Also, let me know if the fluid has been changed and if the gear indicator is indicating the correct gear.
Take care,
Joe
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Tuesday, July 12th, 2022 AT 9:42 PM