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  • The TOPDON LITE scanner indicated that the the Glow plugs in cylinders #1,3, 5 were bad. I removed
    them, tested with an ohm meter and they checked ok. Then I tested them with 12 volts DC and
    they would get red hot in only about two seconds. With a TOPDON PRO hope for something new
    will come up. So far, the 6.6 L Duramax LLY
    makes no effort to start with the starter spinning great.
    With my "No Start" problem I tried using a scanner which posted a code of PO81-3F. It read "Wait to start" ign failed. Any suggestions will be appreciated.
    • Like
    Reactions: jrsavoie
    Yesterday I got the same reading with a different scanner. PO72, 73, and 75, Descriptions: "Glow
    plug control circuit" So, maybe they are talking about the glow plug module. I don't even know where that is, and if I
    find it I don't know how to check it. I guess, as a last resort, we will have to have it towed to the GMC dealer and see if they
    can determine why it won't start. :(
    I took off the dog box and found it. Now I have to get it out and try a new one. I'll post the results later.
    Installed a new one but still get the same fault..
    The lift pump is not pumping fuel to the fuel filter now.
    I have it removed and checking,.
    Dec 2023
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