Service 4WD Message May be Displayed on GMC Sierra 1500 HD

The 4WD transfer case position sensor or the selector switch may fail causing the service 4WD message to be displayed.

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Average mileage: 120,500 (72,000–180,000)
Drive Trains affected: 4WD, Automatic Transmission
5 model years affected: 2001, 2002, 2003, 2004, more2005
9 people reported this problem
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problem details
2003 GMC Sierra 1500 HD - 4WD 72,000 mi,
selector switch for transfer case doesnt work and light work off and on. 4 wheel drive service light comes on. havent fixed yet will change switch
2001 GMC Sierra 1500 HD - 4WD 120,000 mi,
service 4 wheel light