I have a 2000 GMC Jimmy with 100,000 miles. When I press the buttons
on the dash to shift to 4 Wheel High or 4 Wheel Low, the button lights
change, I hear the solenoids click, but the front wheels receive no
power. It shifts in to low range when I press 4 Wheel Low, but again
no power to the front wheels. What is the most probable cause? I
have heard others complain about the push-button 4 Wheel Drive having
probles at about 100,000 miles.