Transmission fault the gear will not select?

2008 HYUNDAI SANTA FE
200,000 MILES • 2.2L • V6 • TURBO • 4WD • AUTOMATIC
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TAOLAW8
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When I am driving my gear will be select and once I attain 80mph speed ,the gear will not select and stop on the select one may be 3 , if I mash brake also it will not go back to one , unless I shift my gear lever to P and select it back to Drive. And if I use it manually it will do the same thing and I have replace the gear box still the same.
Nov 19, 2024 at 9:45 PM
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STRAILER
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This can be caused by many things; can I ask if you have a check engine light on? We should run the codes to see if any are stored. This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Does the engine seem to have good power? Because a clogged catalytic converter will cause this issue, and I have seen a weak input shaft speed sensor cause this problem as well. Here is the location of the sensor in case a code is stored for it. Check out the images (below). Please let us know what happens.
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Nov 21, 2024 at 11:05 AM