Service 4wd light comes on.

2006 GMC SIERRA
10,200 MILES
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TOMK
  • MEMBER
  • 1 POST
2006 GMC Sierra 4WD shifts itself from 2 hi to 4Low while sitting unattended in a parking lot. What is the likely culprit? When I arrive at work I am in 2wd Hi. When I come out at lunch time and start the truck, it has shifted into 4wd Low
Dec 1, 2011 at 3:23 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Check the actuator for proper operation. Check wiring at plug into the actuator.
Dec 1, 2011 at 5:45 PM
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