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Service 4WD system 08 Gmc Sierra


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I recently started to get "Service 4WD System" every time my 08 gmc Sierra with just over 300k on it is started. I can clear the message but it comes back the next time I start it. Does anybody know if there is a sensor in the transfer case shift motor simular to a 06? Had the encoder ring sensor go bad on the 06 replaced it and all trouble went away.

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