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  1. #1

    Default DTC P0677 Cylinder 7 glow plug circuit

    My check engine light came on after a road trip the other day and it was a P0677 code. That is the cylinder 7 glow plug circuit code. That is all the info I can find on this code. What does it mean?? Did something fail? It is running like a champ, and there doesn't seem to be anything wrong, other than the trouble code. I cleared the code, and it has not been back yet.

    2006 GMC Sierra 2500HD Duramax

  2. #2


    Hi aboston, did you ever get an answer to this or have you resolved the issue? I am having the same codes expect mine are on 7 and 8. I don't want to blindly take my truck into the dealer and have them tell me I need major work when I don't.

  3. #3


    sorry for the delayed response. I never did find out exactly what that code meant. I have been meaning to get anothee glowplug to replace it, but havent yet. Truck is running like a top, so i am guessing it is the glowplug which i probably dont even need where i live.

  4. #4
    Jr. Apprentice
    Join Date
    Oct 2010
    Frederick, CO


    Connect a test light to the positive battery post and you should get it to light up when you touch the glow plug wire. If it doesnt light up then your glow plug is bad. If it does light up then you need to pull it and measure resistance from the terminal to the threaded portion of the glow plug it should measure around 1.5 ohms. Remember cylinders 2468 are on the driver side and 1357 are on the passenger side. probably just needs a glow plug it is pretty common.

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