Forum Discussion

Thom02099's avatar
Thom02099
Explorer II
Jul 27, 2018

OBD Code P0671 - Duramax

2007 GMC Sierra SLE 3500 with Duramax/Allison Combo. Have recently gotten an OBD Code P0671, which points to an issue with the glow plug circuit in cylinder 1. There are absolutely no symptoms of any problem, truck is running fine. It's only done it twice, when the truck has been sitting several days; doesn't do it when the truck is run regularly.

I know I need to have it checked, but I'm leaving on a trip tomorrow and won't be able to address it until next week. How serious a problem could this potentially be? I've seen varying opinions on cause and potential issues.

Thanks for assistance.
Tow Vehicles
  • 6_6_Oilburner's avatar
    6_6_Oilburner
    Explorer
    Jul 29, 2018
    To hopefully save you guys all some aggravation......Don't use anything but an AC Delco 9G replacement. Thats the newest part number and all of the aftermarket replacements I've had any experience with have been sub par. How easy they come out depends on how rusty the truck is.
  • bartlettj's avatar
    bartlettj
    Explorer
    Jul 29, 2018
    A dead glow plugs will cause more frequent regens if you start it cold a lot. The cold cylinder will smoke a bit until it gets warm enough.
  • KD4UPL's avatar
    KD4UPL
    Explorer
    Jul 28, 2018
    I wouldn't worry about a glow plug until it at least gets cold. Only then if the truck doesn't seem to start very well. You would probably never fix it with no ill effects.
  • Thom02099's avatar
    Thom02099
    Explorer II
    Jul 27, 2018
    Hey, thanks for all the info, folks! I figured what you've said might be the case, based on what I read. Heading up into the Rawah Wilderness and NeverSummer Mountains, sure didn't want to get stranded up there!

    Thanks again.
  • 2001400ex's avatar
    2001400ex
    Explorer
    Jul 27, 2018
    Charlie D. wrote:
    If replacing yourself gently turn to loosen and make sure it is not seized, Breaking it off will be a huge problem, Replaced 3 on my 2006. One by dealer and two myself. Added a little never seize to the threads.
    First one went out in Wyoming on a 5 week trip. Dealer said it was emission and I could drive without it. Another 3 weeks and 3,000 miles before I got back home and no issues


    My pickup has 166k miles and mine came right out. Trick is to do it when the engine is warm. And just change it out when you change the fuel filter. Have to take the fender well off and it's right there. Easier than a spark plug.
  • NMDriver2's avatar
    NMDriver2
    Explorer
    Jul 27, 2018
    busterja21 wrote:
    that code is the #1 (front passenger side) glow plug is bad. only symptoms are that it may start harder in cold weather, and your remote start wont work when the code is active. It's a 15 minute fix, and about 25 for the new glow plug.


    X2 This time of year you will be fine without any glow plugs. The number 1 plug is one of the easiest to get to and there are youtube videos on changing it.

    You will be fine driving on your trip with one plug not working.
  • Charlie_D_'s avatar
    Charlie_D_
    Explorer
    Jul 27, 2018
    If replacing yourself gently turn to loosen and make sure it is not seized, Breaking it off will be a huge problem, Replaced 3 on my 2006. One by dealer and two myself. Added a little never seize to the threads.
    First one went out in Wyoming on a 5 week trip. Dealer said it was emission and I could drive without it. Another 3 weeks and 3,000 miles before I got back home and no issues
  • busterja21's avatar
    busterja21
    Explorer
    Jul 27, 2018
    that code is the #1 (front passenger side) glow plug is bad. only symptoms are that it may start harder in cold weather, and your remote start wont work when the code is active. It's a 15 minute fix, and about 25 for the new glow plug.
  • Skidus1's avatar
    Skidus1
    Explorer
    Jul 27, 2018
    I had to replace glowplug #6 in my 07. It would trip a check engine light which was cleared for 2 years with my tuner before I took it in as I don’t drive it much. No symptoms as the other 7 took up the slack. They are easy to replace but I was nervous cause of the age of truck. Cost around 180 to change out glowplug and an hour at the dealer if that’s the issue.
  • Turtle_n_Peeps's avatar
    Turtle_n_Peeps
    Explorer
    Jul 27, 2018
    I've had a glow plug burnt out for well over a year. I just need time to replace it. My truck starts fine even in the winter with 1 glow plug burnt out. It's a pretty quick fix. I don't know how easy #1 is to get to though.

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