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  1. Duramax Second Generation: 2004.5-2005 (LLY)
    I have a 2005 2500hd that is going into limp mode. There are no codes and it won't go over 2000rpm. I put my factory tune back on it to tow. I pulled prolly 12k gooseneck last week with no problem but now it's going into limp mode I guess. I'm getting 200000 psi of fuel pressure at times...
    lly limp mode
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