If you want to save $600 and your truck has less than 36K miles, bring it in ASAP.
Got the same "SERVICE 4WD" message and have been ignoring it for a few weeks. Then fianlly got a chance to bring it in. My rig has 44K+ miles when the message first showed up. The diag from the tech says the "TRANSFER CASE SHIFT MODULE" has to be replaced. The damn thing is about $350 and labor is about $250.
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03 Yellow Hummer H2 - Wife's School Bus- Pioneer AVIC D3 w/ backup camera/iPod integration/Sirius, 24" DropStars with 36" Pirelli Scorpions, Real HIDs, Bling-ed out...
04 Black Acura TL full A-Spec
88 Red Porsche rare 930 Cab
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