My 2006 GMC Envoy will not switch into four-.

Tiny
ANONYMOUS
  • MEMBER
  • 2006 GMC ENVOY
  • 114,183 MILES
My 2006 GMC envoy will not switch into four-wheel-drive high. The light on the switch indicates that it's on but there's no power to the front differential When driving on ice. After switching it into four hi I don't hear a clunk. So I don't know if it's a vacuum switch or the module that's bad. Is there anyway to tell without going to a service center
Sunday, December 23rd, 2012 AT 5:02 PM

1 Reply

Tiny
HMAC300
  • EXPERT
Check to see if actuator is getting power on tcase, that is the bigest failure on these for that problem'
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Sunday, December 23rd, 2012 AT 6:54 PM

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