1998 GMC Jimmy Q&A
1998 GMC Jimmy Question: how do i locate and replace the 4wd sensor switch.
scan codes and post so we can adv - globalhelper
There is a vacuum switch on top of the transfer case that is defective, replace it and problem solved!! Just fixed mine, had the same thing going on. NAPA part # 7301639. Tough repair without a lift!! Vacuum is what actuates 4x4 system! - pushrod