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Registered
2006 gmc envoy_sle
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39 Posts
Discussion Starter #1
My sister's 4wd does not work and we're not sure how long it hasn't worked.

We were at our lease and needed 4wd but it wouldn't engage. Got to looking at the 4wd disconnect and it was completely shot (seal was gone and was in pretty bad shape overall). Got that replaced along with the front diff actuator. I can hear an actuator engage as well.

We have also replaced the switch and replaced all fluids (inexpensive and cheap insurance) but it still does not work.

I found a step-by-step troubleshooting guide but haven't had a chance to try it out.

Any other common issues to look at? I haven't checked out the shift motor/actuator on the t-case yet though.
 

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Registered
2004 gmc envoy_slt
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2,247 Posts
When you move the 4WD selector from 2WD to 4HI (or back), do you hear two distinct motor sounds? One should be from the disconnect actuator and the other from the encoder on the Transfer case.
 
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