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2007 GMC Sierra 3500 HD Question: What would cause my service my 4wd to come on on my dash.

 

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Modar, Anchorage, AK, October 17, 2012, 10:09
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Service my 4wd came on on my dash after a guy installed a snow plow on my truck. Could he have shorted out something? There was no problem before he installed the snow plow.

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