GMC Troubleshooting Questions? Ask a Mechanic for Answers
hello . do you also have a tilt column ?
also . do you ever see any fluctuations on your speedometer or lose the speedometer ?
One thing you could try is when the cruise will not set , put your foot under the brake pedal and pull up on the brake pedal and try again to engage the cruise control
okay that can be your issue then . You need to check your brake light fuse
see the diagram