Auto 4 wheel drive

2000 GMC SIERRA
165,000 MILES
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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 5, 2012 at 4:50 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
If you feel it on a dry surface, it is working.
Mar 5, 2012 at 7:13 PM
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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 5, 2012 at 7:35 PM
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