2006 Gmc Envoy Will Switch Into Four Wheel Drive High Light On Indicates That

2006 GMC ENVOY
114,183 MILES
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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
Dec 23, 2012 at 5:02 PM
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HMAC300
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check to see if actuator is getting power on tcase, that is the bigest failure on these for that problem'
Dec 23, 2012 at 6:54 PM
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