Ignition Key Problems on 2002 GMC Envoy

Ignition Lock Cylinder Control Actuator
If the vehicle is equipped with a floor mounted console gear shifter, it has a ignition lock cylinder control actuator system in the steering column as an added safety feature. The ignition lock cylinder control actuators purpose is to prevent the steering wheel from being locked when the transmission is in gear and the vehicle may still be moving. The column ignition lock system consists of a ignition lock cylinder control acutator, and a park position switch that is located in the A/T shift lock control switch. The ignition lock cylinder control acutator contains a pin that is spring loaded out to mechanically prevent the ignition key cylinder from being turned to the lock position when vehicle transmission is not in the Park position. If vehicle power is lost, and/or the transmission is not in the Park position the operator will not be able to turn the ignition key to the lock position and will not be able to remove the ignition key from the column. GM has had some problems with this , If you have the console shifter there is a micro switch that when put into park a linkage pushes on this micro switch closing the circuit to ignition lock cylinder control actuator allowing you to remove your key ! These linkages fall out causing this problem ,an have electrical wiring problems as well ! I fixed a 2006 Chevy cobalt that had this same problem by getting a used shifter assembly at the auto salvage year ! cost $20.00 . There mite be a access hole under the bottom of the steering column with a release button up inside !

if it is a steering Wheel not locking ..some GM has no steering Wheel lock.

hope it helps

make sure battery is 12.6 volts. if not you not going to be able to get transmission go all the way in park to remove ignition key.when you press brake pedal it energize brake transmission shift interlock to get transmission all way in park to remove ignition key.if all is good battery is 12.6 volts.sound like ignition switch lock cylinder broken more likely.

Replace your ignition switch, common problem, especially in 2002. As far as getting your key out:

Look under the switch that you put your key in on the bottom part of the steering column cover....In your year, some have an open hole there in which you can push the solenoid to release your key. Others have an outline of where a hole was going to go, will be very faint. But this can be carefully cut or drilled out to access the solenoid.

It may be a transmision linkage problem. Try shiftind gears from park, N, D, 3, 2 ,1, back to park.

Ford? The lock is worn out.

You either need a new ignition switch or there is a part that won't let the key turn if the car is not completely in park. you might need to replace that, it could be broke

the lock on the driver side could be damaged or some on might have used a jimmy to open that door before how evr you have to open the pannel and remove the lock cylinder part and make sure that the key is working or yo must change the tumbler s in the lock to fit your key (lock smith)

Hey. Your problem look to be a battery concert.
if you are sure of the battery is Ok.
Remove the Battery terminal inspect and clean.
And put back the teminals. Tight a little hard.
because one of the problems on this kind if vehicles are the battery conncetions. That came in misscontact.
After all of this . Check all the fuses Include the MEGA FUSES.
Replace as need. with the same rating.

Check the Red wire going to the fuse block. If is nessesary
Go to the autopart and buy a test light.

OK.... I hope this can be a start prosses to fix your car.

If your 2002 gmc envoy or sierra will not even turn over with a kown good battery try starting it in nuetral then go back to park and try starting again. There is a park nuetral safety switch that can malfunction. Turn the key on then shift into nuetral, then turn fully to start.