2004 sonata slipping between 3rd and 4th gear

2004 sonata automatic.
Keeps slipping between 3rd and 4th gear. No other gears not even reverse are working. I know jack all about cars but need this fixed for my pop. Any ideas on what it could possibly be? Cheers.

If none of the other gears are working, how does it get to the speed needing 3rd to 4th gear shift? And if in fact. None of the other gears are working check the fluid level first.

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Most likely your Shift Solenoid has failed.
I’m hot dure but I think that it is not inside of the transmission on this, and that it would not be hard to replace it.
I’d say under $100 for the part.

Or you need an entire transmission replacement.