Key will not come out of ignition. have to push shift release button to shift out of park

possible internal locking pawl stuck fault or adjustment required

ADJUSTMENTS
sourced from another forum

The park interlock cable is part of the brake/shift lever interlock system. Correct cable adjustment is important to proper interlock operation. The gear shift and park lock cables must both be correctly adjusted in order to shift out of PARK.

ADJUSTMENT PROCEDURE

1. Remove floor console as necessary for access to the park lock cable.

2. Shift the transmission into the PARK position.

3. Turn ignition switch to LOCK position. Be sure ignition key cylinder is in the LOCK position. Cable will not adjust correctly in any other position.
NOTE: If the key will not turn to the LOCK position, pull up on the cable lock button and manually move the cable in and out until the key can be turned to the LOCK position.

4. Pull cable lock button up to release cable, if necessary.

5. Remove and discard the cable adjuster lock pin, if a new cable is being installed.

6. Ensure that the cable is free to self-adjust by pushing cable rearward and releasing.

7. Push lock button down until it snaps in place. The lock should be 1-2mm below the surface of the cylindrical portion of the cable

You have to fully apply your regular brakes before you can shift from PARK (P) when the ignition key is in the RUN position. If you cannot shift out of PARK (P), ease pressure on the shift lever -- push the shift lever all the way into PARK (P) and also release the shift lever button on floor shift console models -- as you maintain brake application. Then move the shift lever into the gear you wish.

shift lever does not move out of the PARK position with the ignition ON and the brake pedal pressed ?

that is park lock failure, build into the shifter section,it has an
electric solenoid lock. and a bypass button.
in the glove box, see oper. guide, it tells you where the erg. release
button location, and varies by sub body type and options.
its hidden cover, or a slot, on most cars. the slot type is to insert
any key in slot and push. bang, it opens (brake set,etc)

91 Grand Prix SE: If you can turn car off with the key, but can't get the key out - first thing you should check is to see if the button on the shifter is fully releasing (the button on the shift handle you have to push to shift out of Park).

Most newer models have a safety feature called
shift interlock. This prevents the key from being turned back
to the lock position if you forget to place the gear selector in park.
Depending on the model,
If it uses a cable, it may be sticking or needs adjusting.
If it uses an electrical solenoid. may be blown fuse or park switch.
Tap, shake, and pull up on the shifter and make sure it's in park.

Ignition - Key Stuck In Ignition Switch/Won't Turn Bulletin No.: 06-02-35-005 Date: February 28, 2006 TECHNICAL Subject: Key Stuck in Ignition, Key Will Not Return to Off Position, Shifter Button Won't Release in Park Position (Adjust Shifter Detent Finger) Models: 2002-2005 Chevrolet Monte Carlo Condition Customers may comment on any of the following conditions: - The key is stuck in the ignition cylinder. - They cannot return the key to the off position to remove the key. - The shifter button won't release in the park position. Cause This condition may be caused by the detent finger shifting over time. This may result in mis-alignment and binding of the shift rod on the shift position guide.
WHERE YOUR SHIFTER IS YOU WILL HAVE TO TAKE IT APART ..MAYBE THE RUBBER BOOT IS IT THE WAY,OR THE SHIFT LOCK SELINOID WHENT BAD

have the linkage checked and the pin under the shift column

I got same problem when I first got the car (bought used), took me a day to find out one of the fuse blown caused the problem now I always have 10A fuse spare in my glove comparment, check all your fuses (I believe it's an Audio/Clock 10A fuse) will solve your, good luck ...

1. is the steering wheel unlocked?
2. check if there is a small 'push' button beside or somewhere the ignition. push and turn to off simultaneously.

hope it helps