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2006 GMC Sierra 2500 HD Question: My service light is on and I have a slight whining noise when I start to drive

 

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Jtgolf, 6.6L V8 Diesel Turbo, Henderson, NV, July 13, 2013, 07:31
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My truck has gone into limp mode than back out again when I re start it drove fine last time but I know something not right

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