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  1. Duramax Second Generation: 2004.5-2005 (LLY)
    I have a p0299 which is a low boost code I believe and p0401 and p0404 which are egr codes. The p0299 throws the pickup in limp mode or reduced engine power mode and I don't know what's wrong with it I've checked everything I know to. Also the turbo flutters alot if I boost it up against the...
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