I attached the testing just for your review. However, this is normally one of two things. Either the torque converter shift solenoid is the issue or the wiring to it.
If the issue is the solenoid then the part looks to be about $200 and the labor will vary depending on the amount of diagnostic time they need to figure it out plus what their door rate is so it is hard to give you an estimate on something like this. If the vehicle drives, then I would just take it slow and back roads if needed but you are not going to do any more damage to the transmission with this issue. It just won't shift to overdrive.
If you feel more comfortable towing it then that is always an option.
Please let me know what questions you have. Thanks
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Saturday, May 2nd, 2020 AT 8:35 AM