Hi,
Is the check engine light staying on while the engine is running? There could be diagnostic trouble codes to help explain what is happening. If it isn't and there was no evidence of a problem such as slipping or slow to engage issues, I suspect something has lowered line pressure in the transmission.
This guide can help
https://www.2carpros.com/articles/automatic-transmission-problems
Again, this recommendation is based on the idea that no trouble codes are present. At this point, I would remove the transmission pan and inspect both the filter to see if it is plugged and the pan for evidence of clutch material or even metal shavings. If the fluid hasn't been serviced in a long time, it may have caused something to plug.
Before you do that, check and confirm that the shift indicator in the vehicle is working and indicating the correct selected gear. Also, make sure the linkage to the shift lever on the transmission is actually moving and not loose or disconnected. If I recall, the shift linkage is actually a cable, so check that as well.
Let me know what you find.
Joe
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Wednesday, January 1st, 2020 AT 8:52 PM