SOURCE: My 1999 gmc yukon denali
Check the brake switch. The brake switch releases the locking pin for the shifter when you apply the brake. Common problem with GM. Turn the key on, apply the brake on and off and listen to see if you hear a click in the steering collumn. Do this a few times to make sure you can hear it. If you can't then the switch is bad.
Testimonial: "Thanks for the help but there is a click and I had something repair up in the steering column before. At least it points me in the right direction. "
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