I have a 2005 Monte Carlo I couldnt shift out off park so had to reach down below the shifter push down on the the lever to shift, I checked the a/t shift lock control selonoid its fine it seems when I push the button on shifter its about 1/4 short of pushing lever far enough down to shift

spring --damaged clip--debris --need to remove cover to access the bottom of shifter ---and possible shift interlock failure
https://www.youtube.com/watch?v=0LDkoecODII this link shows bypass and fixes

The first thing you need to do is check to see if the brake lights are working (lower lights not high mounted brake light), the park lock system gets power from the brake light circuit and will not release the shifter unless the brake pedal is pushed and the brake lights actually work.

Help! Shifter stuck in park - Monte Carlo Forum - Monte Carlo ...

montecarloforum.com > ... > Engine/Transmission/Performance Adders
Jul 20, 2010 - I'm new here and desperately need some help with my 2006 Monte. ... ofpark. Tried rocking car back and forth but it seems to be the switch or solenoid that stops car from going into gear without ... 1984 Chevrolet Monte Carlo. Trans Stuck in Park - Monte Carlo Forum - Monte Carlo Enthusiast ...
Apr 28, 2013
gear shift locked up - Monte Carlo Forum - Monte Carlo Enthusiast ...
Aug 17, 2012
Getting stuck in park - Monte Carlo Forum - Monte Carlo ...
Dec 12, 2011
HELP!!!! My KEY is STUCK IN IGNITION - Monte Carlo Forum
Jun 20, 2011
More results from montecarloforum.com

Don't know about needing the brake pedal pushed to get INTO park, but it might, as the pedal needs to be pressed to get it OUT of park.

check for bad or bent shifter cable from shifter to trans.

Don't waste your time looking for a headlamp relay. You will not find one. 1983 Monte Carlo does not use a headlamp relay. Your problem is most likely a defective headlamp dimmer switch. It is located about halfway down the upper left side of the steering column. It is secured by the same screws that mount the ignition switch. It is activated by a metal rod that pushes down on it when you pull back on your turn signal lever. It looks like the picture below.

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

SHIFTER LOCKED IN PLACE

1. Remove the instrument panel cover below the steering column, then remove the steering column shrouds to gain access to the brake transmission shift interlock (BTSI) solenoid. The solenoid is part of the interlock cable assembly.
2. Disconnect the wire connector from the rear of the BTSI solenoid.
3. Insert the ignition key and turn it to the ON position.
4. With the brakes applied, try moving the shifter out of the PARK position.

• If the lever now moves freely in and out of PARK, perform the Circuit Test below.
• If the shift lever still does not move from the PARK position, remove the BTSI solenoid from the shift lever assembly. If the shift lever now moves freely in and out of the park position, the BTSI solenoid is faulty and the interlock cable must be replaced. If the shift lever still does not move from the park position, the problem is in the shift lever assembly or the ignition interlock cassette

it is the shift lever solenoid, if you can acess the inside of the console where the gear shifter is on the bottom left side of the shifter you will see an electrical connecter that has 2 wires hooked to it this is the solenoid, you can replace this and it will fix your problem, or you can just unplug it and the shifter will work, if you choose to leave it unplugged beware that the transmisson will now be able to be shifted into gear without your foot having to be applied to the brake, but hey, who puts their car in gear without their foot on the brake, all this system is is a saftey device to keep you from shifting into gear without your foot on the brake

Here's how to override the shift lock on a 2006 Monte Carlo. First, remove the top of the shift console by pulling up on the plastic piece directly in front of the hinged cover. This is the piece that has the cup holders molded into it and it is held in place by 4 clips (i.e. it will pop back into place with no tools).

Next, shine a flashlight down into the console to the right of where the shift lever passes through (passenger's side). You'll see a wiring clip with 4 or 5 wires going into it. Directly behind this clip you can see a metal shaft with a flared top that looks like a button. This is the shift lock override button. Reach in behind the wiring clip with your right hand and press this button in. With the engine running, hold the button in with your right hand, press on the brake, and shift out of park with your left hand.

Now you can drive the car to your mechanic (or to your own garage) to find out why the shift lock solenoid is not working. On mine it was obvious. A wire going into that clip near the override button came loose and there was no power to the shift lock solenoid. I removed the clip, reattached the wire, and replaced the clip. Problem solved, fixed for free!