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 Chevrolet Silverado 2500 HD
Average mileage: 151,062 (2,300–277,502)
Drive Train affected: 4WD
20 people reported this problem
9 people shared problem details
2005 Chevrolet Silverado 2500 HD- 4WD277,502Visitor
PUSH BUTTON FOR FOUR HIGH AND THE LIGHT BLINKS AND SERVICE 4X4 CODE COMES UP.TRIED PUTTING IN FOUR LOW AND IT MADE A CLUNK AND COULD NOT GET OUT THEN AFTER TRING FOR A WHILE IT CAME OUT?
2001 Chevrolet Silverado 2500 HD- 4WD97,654Visitor
service 4WD light came on at 97654 as I pulled into my driveway turned pickup off and restarted and light stayed off. Then at 105136 service 4WD light came on again diving down the highway pulled off the highway onto shoulder turned pickup off and then restarted light stayed off but taking pickup to be serviced this week.
2003 Chevrolet Silverado 2500 HD- 4WD189,465Visitor
information center displays service 4x4 changed 4x4 transfer case selector same issue service 4x4
2005 Chevrolet Silverado 2500 HD- 4WD275,000Visitor
service 4wd message came on. replaced position switch
2003 Chevrolet Silverado 2500 HD- 4WD136,000Visitor
Won't engage 4 wheel drive
2008 Chevrolet Silverado 2500 HD- 4WD90,000Visitor
Service 4x4 comes on for no apparent reason
2002 Chevrolet Silverado 2500 HD- 4WD250,000Visitor
bangs when engauging to four hi
2013 Chevrolet Silverado 2500 HD- 4WD2,300Visitor
2015 Silverado 2500 4WD service warning comes on for no apparent reason.
Replaced 4WD electrical engage system one year ago and the problem has now returned. The cost was over $800.00 for this repair.
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