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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    I have had issue with low rail pressure for some time. Recently, I had a airdog II 4G installed but hadn’t had the opportunity to tow the camper until this weekend. When I came to a hill, the light came back on and It went into limp mode. The code says “low rail pressure” and sometimes the DIC...
  2. Duramax Fifth Generation: 2011-2016 (LML)
    I broke the crank on my original engine and replaced it with a reman. Prior to the breakdown, all things worked at optimal condition. Now that we have the new engine in, I'm showing 260-305 psi in the fuel system. Turns well and strong but won't start. Not enough pressure. I've primed the system...
  3. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    I have a 07 LBZ that is throwing a code for low fuel rail pressure. It only does it when ambient temp is over 90’F and I’m towing at highway speeds. I already replaced the fuel rail relief valve and the fuel filter and now I’m suspecting one or more injectors may be bad. I have noticed a...
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