Parking brake won't release - Denali GMC Cars & Trucks

Look for a blown fuse.

you need to look under the truck and see witch parking brake cable is frozen

If you never us it the cables will rust thus when you apply the brake then release it it wont release all the way.try holding the release and pulling the pedal up by hand while the release is pulled

I had the same problem on my Passat Variant 2007.
Randomly Park Brake won't activate and/or deactivate once button PB pressed.
The cockpit computer tells "Park Brake Error" (or something similar).
If this is your problem, the issue is very well known to VW Service centers.
I had solved it by bringing the car to the Service: The told me that they substituted the ParkBrake Button (a differently made one, even if identical on the exterior) and Reprogramming (Updating) the car computer software.

Park brake lights normally operate by a small plunger type switch the turns off when the level or pedal is placed in the off position. Over time the spring in the lever weakens and placing the lever in the off position no longer depresses the switch. The switch can sometimes be adjusted to make better contact, or the switch bracket can be bent so the lever and switch make proper contact.

does it have the lever or pedal for the parking brakes!!

you should hear a click from the solenoid when you apply the brakes. If your brake lights don't work, your shift lock release won't either. There is a bypass method for emergencies in your owner manual. Check fuse for brake lights. And switch on brake pedal

do the brake lights work? most of the time the problem is a broken wire at the brake light switch under the dash on the brake pedal. the ECM does not see the signal from the switch so it won't allow the car to shift from park.

if it willnot release, then most likely one of two things has happened.

1. The release inside the vehicle has broken away from the the actual cable,
2. The cable it self is frozen.

Either way, you will need to get under the vehicle to see what happens when some one inside the vehicle is trying the release.

Does the brake light stay on, indicating that the brake is on?

YOU NEED TO ADJUST REAR PARKING BRAKE AT THE LEVER.FIRST OF ALL YOU NEED TO BLOCK FRONT WHEELS.THEN RAISE THE REAR OF THE VECHICLE.SUPPORT WITH JACK STANDS.MAKE SURE YOU ARE ON HARD LEVEL SOLID GROUND WHEN USING JACK STANDS.AFTER RAISING THE CAR SET PARKING BRAKE 1 CLICK TOWARD ENGAGEMENT.REMOVE FLOOR CONSOLE.TIGHTEN THE ADJUSTING NUT UNTIL THE PARKING BRAKES DRAG SLIGHTLY WHEN THE REAR WHEELS ARE TURNED.RELEASE THE PARKING BRAKE COMPLETELY.CHECK IG PARKING BRAKES DRAG WHEN REAR WHEELS ARE TURNED.READJUST IT NECESSARY UNTIL THERE IS NO BRAKE DRAG FROM THE PARKING BRAKES.