No 4-wheel drive

Old 11-28-05, 08:41 PM
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Join Date: Nov 2002
Location: Canada
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No 4-wheel drive

I've got a 1999 GMC Envoy 4.3 L , auto 4x4. I cannot get it to shift into 4-Hi or 4 Auto. The lights for those setting on the dash switch just flash . It switches in 2 wheel drive and 4-Lo but not the others. I'd appreciate any ideas if anyone has had the same problem. Tranny works and shifts fine.

Old 11-29-05, 07:04 AM
Join Date: Apr 2003
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Sounds like your encoder motor has failed, a quick and temp fix is to disconnect the battery for a few min. and see if it works, doing this sometimes will get you 1 or 2 shifts.

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