Hi,
The hard shift is usually the result of a line pressure issue. By chance, has the transmission been serviced recently? Have you checked the fluid level and condition of the fluid?
I ask about the service because it could be a partially plugged transmission filter causing issues. If you haven't, start by checking the fluid. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid
Let me know what you find. Also, let me know if the check engine light stays on while the engine is running.
Take care,
Joe
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Saturday, January 29th, 2022 AT 2:39 PM