Service 4WD Message May be Displayed on GMC Sierra 2500

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

RepairPal Verified
Average mileage: 162,666 (38,000–230,000)
Drive Trains affected: 4WD, Automatic Transmission
6 model years affected: 1999, 2000, 2001, 2002, more2003, 2004
10 people reported this problem
3 people shared problem details
service 4 wheel drive message and lights switch to 4 low or just blink. must turn off p/u to stop and show 2 wheel.
2000 GMC Sierra 2500- Automatic Transmission38,000
lIGHT COMES ON...tHATS IT
2004 GMC Sierra 2500- 4WD220,000
service 4wd light on
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