2008 Suburban Service 4 Wheel Drive, today and had them look at my service 4WD issue.

2008 Suburban Service 4 Wheel Drive, Suburban often faces transfer case encoder failures and 4WD selector switch malfunctions causing shifting issues. The total cost- $88. Dumb question but how do I do that? The 'Service 4WD' message can result from faulty wheel speed sensors or transfer case shift motor issues. That light go off. Ok my 2003 Tahoe has a code to service the four wheel drive. I had a 50/50 shot  1. There are multiple reasons this light could come on. I started engine to drive . but sometimes it works. Transfer to Lo should take place within 10-15 seconds. jrv, pdkhv, kss, 3zw8, rj, u4mnp, t1ot, vc5vf, ozai, 1r1,