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It about the 4 wheel drive system

(2005 GMC Sierra 1500)
in Bruceton Mills, WV on January 05, 2014
i have a GMC sierra 1500 I've change the switch twice an change the actuator three time an am still getting the service 4wd message i check online to find the answer an it's the the same thing change the actuator
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of G. T. Service Center on January 05, 2014
It really needs to scanned to read the transfer case module to find the real problem, could be just a software update.
on July 22, 2016
From Day one (8/15/05) my Selector switch has given me problems. 2 switches, software update, TCCM replacement (warranty finally) and now I'm being told that my transfer case needs to be completely replaced!!! I'm done! This has been the only consistent issue with this truck and GM will not acknowledge the issue. HD's and Diesels do not have this issue, I have asked anyone and everyone who i see that has this style of truck. Looks on the Silverado 1500 page with this issue and its crazy!!!
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