2001 GMC Jimmy 4Whl auto not engaging - Dash Control Panel


Old 11-13-05, 08:44 PM
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2001 GMC Jimmy 4Whl auto not engaging - Dash Control Panel

I have an SLE 2001 GMC Jimmy with V-6 4.3, auto and 4 whl drive with the N8 Auto 4-whl control panel. When I push the 4HI setting the light flashes for a long while and doesn't go into the 4 whl mode. It reverts to 2whl. When I am in the garage, and push the 4whl button, I can hear a click from under the front but no engagement of 4-whl as detected by stiff tire movement in a turn (tire scrub etc.). When I then hit 2-whl button it flashes and then goes on steady with a corresponding audible click from under the car.

Any troubleshooting tips? I suspect some "go/no-go" condition isn't being met for engagement of the helix drive spline - but that is a "wag" on my part.

any help to isolate the problem would be greatly appreciated.

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Old 11-15-05, 11:30 AM
Join Date: Apr 2003
Posts: 174
More than likely your encoder (shift) motor is bad, kinda costly at dealer, mucho cheaper on ebay. There is a good troubleshooting guide on one of the s-10 sites, I do not remember which one right now, when I get home I will post a link for ya.

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