Service 4WD Message May be Displayed on GMC Sierra 3500

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.

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Average mileage: (–)
5 model years affected: 2001, 2002, 2003, 2004, more2005
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