4 wheel drive


Old 09-21-07, 11:39 AM
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Join Date: Nov 2002
Location: Canada
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4 wheel drive

I have a 1999 GMC Envoy, 4wd not working, and yes i tried changing the dash switch no difference. I try to go into 4 Hi and the light keeps flashing same for 4 Auto, but it does go into 4 Lo i can also hear the diff engage but it doesn't for the other modes .Any ideas?
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Old 09-21-07, 11:54 AM
Join Date: May 2006
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You can check the loom connections on the transfer case, but I suspect that one is beyond the DIY group.

Hope this helps,

Old 09-21-07, 12:02 PM
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I'm pretty experienced with this stuff so if you have anymore advanced fixes i can try...shoot. thanks again.
Old 09-21-07, 03:15 PM
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If it's working in 4 lo, I suspect it might be a solenoid somewhere for the transfer case. You might want to pick up a repair manual and trace the electrical wiring.
Old 09-21-07, 08:57 PM
Join Date: Sep 2007
Location: wisconsin
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well you can pull codes with a scan tool on it also i have seen a bunch come thru where the t case module terminals get all corroded could check there first it is on the right side behind the panel on the side

check the terminals unplug it and look for green

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