I have a 2005 montie Carlo had lost keys had to remove hole ign went to junk yrd and got a hole ign wit key put it in the dash lits com on won't start can jump starter car runs for 3 to 4 sec an die

sounds to be a bad body control module. it reads the alarm codes and the key. it is located under the dash next to the steering colunm

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

Is there a light on the dash that says SECURITY anywhere? When the passlock anti theft is triggered or failing, it can lock your key along with causing starting issues.
http://vatspasslockpasskeysecurityhelp.yolasite.com/ This link may help if it is Passlock related

Is there a light that says SECURITY somewhere on the dash? These cars are notorious for failing anti theft systems that lock out the starter. This link explains and offers DO IT YOURSELF solutions.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Monte Carlo with VATS and Passlock issues.

to remove ign switch you must remove lower dash panel turn key to acc position and push ign lock at bottom of ign assem located about 1 inch down from front of key cylinder you will see a hole using a pick tool push up and pull out on key to reinsert key must be in acc position please rate this info

You will have to get a locksmith to help you, or take it to a dealership. The new key and switch will have to be the same type that was originally on the car(smart key,or pass key system with the 'chip, or resistor in the key). The on board computer will have to be reprogrammed to accept the new key and switch. Most locksmiths these days have the capability to handle the GM security system, and may be less expensive than the dealership.

Had same problem on my 2000 Impala and my 2001 monty carlo on the impala it was the locking mechanism from the transmission was slightly worn there is an adjustment under the dash to lengthen the pin slightly. The monty I had to change the ignition switch behind the key. U can try alittle light oil or WD 40 in the key hole it may help. Ignition and switch not cheap. It is not too hard too change if your a little mechanical and have a couple hours.

the cylinder lock and key needs replacing.

what blower you talking about.if ac blower your blower relay stuck close. your monte carlo has a super charger blower also.

Yes the 2002 and 2005 are the same model and use the same lock.

2000-2005 Are all the same for anybody else needing similiar info.