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2002 GMC Envoy

 

Question: Service 4wd light on

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pamom1991, York Springs, PA, January 12, 2013, 14:24
 Rookie

Service 4wd light came on and 4wd will not engage. Had been working just 2 days prior. Replaced Front Axle 4wd Shift Actuator Switch after researching (and it was only $79) but still does not work. Tried pulling #8 fuse and back seat fuse but no success. Indicator lights all blink when car is turned on then stops at 2wd. I think I hear a little vacuum sounding noise when I move switch from 2wd through other positions but they just blink with 2wd on constant. Hope someone can help. Thanks.

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  • Answer #1

    milesauto from Miles Auto Service Inc., January 12, 2013, 16:25
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     Master

    Best to have someone that can scan for fault codes in 4wd system. Too costly to guess.

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