Question about 2005 GMC Sierra

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The truck says service 4x4. I press the 4x4 button and it won't change to 4x4. It stays in 2 wheel drive. Could it be a censor? The light sometimes doesn't show color in 2 wheel drive.

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  • Anonymous Mar 20, 2014

    service 4x4 light stays on continuiosly

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  • 249 Answers

I have seen problems in both the dash switches and encoder motors on the side of the transfer case. You need to have the 4x4 module scanned for codes.

Posted on Jul 29, 2010

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