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    2007 GMC Sierra 2500HD

    Changed the fuel filter in june, and I've only put about 5,000 miles on it since. As far as additive I am fairly new to owning diesels and haven't put any in. Hopefully I'll have an answer code wise in a few hours. I'll post then, thanks for your input.
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    2007 GMC Sierra 2500HD

    I guess my initial post didn't go through. I started my truck this evening in about 20 degress f. I think I may have a bad glow plug, but the truck started. About 30 seconds in the check engine light came on, and it would only rev to about 1500 rpm's. I won't have any code info till later today...
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    2007 GMC Sierra 2500HD

    I forgot to mention the year of my vehicle, which in the title to this post.