I hope I am posting this into the right place. I have a 1999 Grand Prix GT that has a random issue. I can drive it sometimes and no issue and others times it will not go into park. It goes into all other gears just fine. The first time this happened my son was driving and he cut the car off with the transmission in reverse and the key stuck in the ignition. I was able to use the release switch under the steering column to release the key and once I did that the car went into Park with out a problem.
I don't think it is the transmission because I check the shift linkage cable and it moves freely plus I also removed the linkage cable and was able to shift the transmission.
I have searched and read a few post with people having issues with wires going to the shifter so I removed the top off of the shifter console and did not notice anything out of place with any wires. I am sort of stuck on what to troubleshoot next.
The last time it happened I was able to re press the brake and wiggle/force the shifter and it finally went into Park.