More than likely this is a faulty shift interlock. What happens is the shift interlock fails, it stops telling the ignition switch that the vehicle is in park so the key cannot be removed.
When you unplug the switch the ignition switch defaults to unlocked and it releases the key.
https://www.2carpros.com/articles/ignition-switch-wont-turn-stuck
The way to confirm this is to test the voltage at the switch on pin 3. If there is a good ground on this wire, then the solenoid is closing it and operating.
However, I suspect the solenoid is the issue and so this is where we need to start.
https://www.2carpros.com/articles/how-to-check-wiring
I attached the wiring diagram below so let's check the voltage and go from there.
Thanks
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Thursday, December 16th, 2021 AT 5:35 PM