Auto 4 wheel drive

2000 GMC SIERRA
165,000 MILES
Avatar
2000GMCPK
  • MEMBER
  • 2 POSTS
When the "Auto" setting is used, the light comes on but I can tell that the transfer case is in 4hi(feel front wheels pulling while turning on dry pavement). All other setting function properly (2hi, 4hi, 4low). Ideas?
Mar 6, 2012 at 12:50 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
If you feel it on a dry surface, it is working.
Mar 6, 2012 at 3:13 AM
Avatar
2000GMCPK
  • MEMBER
  • 2 POSTS
"Auto" four wheel drive should not be engaging on a dry surface. It's designed to engage, similar to 4 hi, during loss of traction. It should be free wheeling, similar to 2hi, the instant traction is found, i.e. a dry road. I was using it on an icy road and noticed that the front wheels did not disengage when returning to the dry roadway. I think GMC calls it Traction Control on the push button four wheel drive.
Mar 6, 2012 at 3:35 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.