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Re: 2003 gmc c/k 1500
Check the Brake light Fuse the key cannot turn if the brakelight fuse is blown because the safety switch is parts of the brake light circuit. also check the brake light switch if the fuse is good and the brake lights do not work.
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Sounds as if the ignition cylinder has an internal problem. You may have a sticky wafer inside the cylinder. You can try using some WD 40 and inserting the straw inside the cylinder and giving it a good spray. You can also try gently rocking the steering wheel back and forth while trying to turn the key. With out the ignition cylinder turning, the gearshift will not come out of park nor will the steering wheel come unlocked. Hop this helps
turn the wheel left or right and see if it turns check the key if it's bent or wiggle the key at the same time it might get frustrating but it might turn had a chevy do it all the time on me.If not you will need a new ignition switch and keys.
The problem is your ignition switch.It is located in the steering column.You have to remove the column covers to gain access to the switch.You don`t have to remove the steering wheel but some do to get better access.Buy the switch first so you know what it looks like and you know what to look for.After removal of the switch make sure that the plastic gears on the new switch line up the same as the old one.Also make sure that the shifter is in park before removing the switch.You should also disconnect the battery and wait a 1/2 hr.before you start.Be careful because the horn ring is going to make contact with the switch.You also have to be aware of static electricity because of the air bag inflator module on the steering wheel.Hope this helps.Good luck.
Try rocking the steering wheel back and forth. Also even though the tumbler is the cause most of the time you should check the electrical part of the switch at times when it goes it won't allow the key to turn. Rocking the steering wheel is so that you can make sure that it is not turning due to the steering lock putting to much pressure on the tumbler.
Sometimes the steering wheel will put pressure on the switch from the steering lock. Try this:
- insert the key that usually works
- with your foot on the brake, make sure the shifter is fully in park
- while turning the key, move the steering wheel left or right firmly
My daughter drives a Suzuki, my solution to her is: while the gear shift lever is in park, lightly put pressure on the gear shift lever, through the park position and while pressing the gear shift towards park light rock left to right while trying to remove the key.
The interlock between the transmission and the ignition switch needs to be adjusted/ repaired or replaced.