Steering Column not locking on 2004 Buick Park Avenue

My mother purchased a 2004 Buick Park Ave.
Here is what is happening.
If the Tilt steering is all the way up, key is out, you cannot move the column shifter. I figure this is normal for locking the steering.

NOW if I drop the Tilt steering down, with the key not in, I am able move the Column shift to neutral or where ever I want and the car will start rolling down or up hill if the emergency brake is on.

Is there some type of sensor that controls this?

Asked by for the 2004 Buick Park Avenue
This is a mechanical steering column issue that I would have inspected ASAP, because it is a safety issue.