4 wheel drive on 2003 GMC Yukon XL 1500

The light by the 2 wheel drive was yellow and now it is red why?

by in Potwin, KS on April 01, 2013
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2 answers
ANSWER by , April 01, 2013
possible issue with rear drive shaft, transfer case, rear diff., rear wheel bearings. should bring in to shop for diagnostic run to confirm or dismiss. do visual inspection of rear wheels(looking for sign of blown seal, oil spattering around rim).
ANSWER by , April 02, 2013
Mechanic + scan test = Best place to start!!