service 4 wd message on 2003 Chevrolet Silverado 2500

took truck to dealer and they could not get a code for the Service 4WD. before this happened i was getting pinging sound from up front when i turned my truck off, i don't get this noise anymore and now my 4wd doesn't work. anything in the front associated with 4wd?

by in Beaverton, OR on February 20, 2011
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