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.
Service 4WD Message May be Displayed on GMC Yukon XL 2500
Average mileage: 69,333 (30,000–110,000)
9 people reported this problem
2 people shared problem details
2005 GMC Yukon XL 250068,000Visitor
The first time this happened, I resoldered the connections on the switch and it worked another two years. Then at the next failure, I replaced the switch. Not hard to do either.
2005 GMC Yukon XL 250030,000Visitor
Service 4wd light came on. Replaced encoder motor sensor.
I replaced the axle shift motor,switch and shift motor. Where can I find a schematic ? Is ther...
Switch has been replaced, transfer case motor has been replaced. When 4 wheel Auto selected, a...
wife was driving and said motor sped up. she parked it and it would not restart. I tried to sta...
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