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4WD switch

Tiny
NAWILLIAMS
  • MEMBER
  • 1999 GMC YUKON
  • V8
  • 4WD
  • AUTOMATIC
  • 207,000 MILES
I have a 99 Yukon Denali and all the lights on the 4wd selector switch are on. The truck is neutral and ready to tow. When I try to select 2hi 4hi 4lo or auto 4wd. It won't select any of the above. Is it possibly the transfer case module?
Friday, August 5th, 2011 AT 8:18 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The actuator on the transfer case if my first guess. Check to see if it is getting power to switch between selections. If there is no power, check relay. Also, if there is power, remove the actuator motor and check for operation.
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Saturday, September 24th, 2011 AT 3:53 AM

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