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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
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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Viewing 1 - 2 of 2 comments
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
service 4 wheel light