Just to clarify, you reset the ECM and checked the dial and it is working now?
More then likely this is a control module issue or shifting/dial issue. These are electronic shifters so it sounds like this would be where the issue is.
However, we need to check codes and go from there. I highly suspect we will have some codes that will tell us what is happening.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
However, if the vehicle is operating now then we may have to wait for it to start acting up again, if it does.
Let us know and we can go from there. Thanks
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Wednesday, January 6th, 2021 AT 6:57 PM