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04 Sierra 2500HD 6.6 Dmax engine codes

gene1114

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gene1114 New Member

gene1114

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Have an 04 Sierra 2500HD with a 6.6 Dmax. Just turned 100k. Check engine light poped on. Had it checked out, and it read control mod.

P0671,0674,0676,0678. What is all this telling me? Truck starts fine and runs fine.

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