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Chevrolet
Avalanche 2500
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Service 4WD Message May be Displayed on Chevrolet Avalanche 2500

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 130,857 (95,000–180,000)
Drive Train affected: 4WD
4 model years affected: 2002, 2003, 2004, 2005
16 people reported this problem
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