Hi there I have a 2000 GMC Sierra(new body style) 1500 4x4 with electronic push button 4wd with auto mode. I work in construction and need the 4x4 almost everyday. A couple times a week the 4wd doesn't engage, it just stays in 2hi, or it will even go into 4hi and get stuck in 4hi. If I play with it long enough it will eventually shift. The "Service 4wd" Message will also appear quite often also. Are there problems with the 4wd actuators in these trucks?
Any help would be great. Thanks