The 4WD transfer case encoder motor position sensor or the selector switch may fail causing the service 4WD message to be displayed. Fault code(s) stored in the transfer case control module will be of assistance in determining the exact fault causing the message to be displayed.
Problems for specific GMC Sierra 1500 years:
Car problem reports
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Most reported 2008 GMC Sierra 1500 problems
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The keyless entry system may stop working. Our technicians tell us the key fobs and keyless entry receiver may need to be replaced to correct this fault.