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Auto 4 wheel drive

Tiny
2000GMCPK
  • MEMBER
  • 2000 GMC SIERRA
  • 165,000 MILES
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?
Tuesday, March 6th, 2012 AT 12:50 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
If you feel it on a dry surface, it is working.
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Tuesday, March 6th, 2012 AT 3:13 AM
Tiny
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.
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Tuesday, March 6th, 2012 AT 3:35 AM

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