Problem overview
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.
459 people reported this problem
161 commentsGMC Sierra 1500 vehicles with this problem
18 model years affected
Average mileage: 147,713 miles
(3,900 - 1,000,000)
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