Need advice on "SERVICE 4WD" warning - Hummer Forums by Elcova

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Need advice on "SERVICE 4WD" warning

12-26-2002, 02:06 PM

Join Date: Nov 2002

Location: USA

Posts: 104

I have a question for some of you experts out there. We went out off roading in some local mountains yesterday. When coming out of 4LO/rear axle lock, we heard a loud "clunk", all transfer case indicators on the dash went out and the message center popped up with the "SERVICE 4WD" warning. We restarted the engine, message disappeared, transfer case indicator lights began working and all seemed fine again. Any ideas on what might have caused this?

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