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Duramax 6600 Welcome to the Internet's first Duramax 6600 diesel discussion forum for the LB7, LLY, LBZ, LMM, LML, LGH & L5P RPO code engines. Tips on performance, fuel economy, troubleshooting and more.

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Old 01-17-2018, 11:19 PM
gary_lucas's Avatar
gary_lucas gary_lucas is offline
Join Date: May 2012
Location: Langley
Posts: 372

Originally Posted by Kennedy View Post
The LLY uses a different plug. They seem to be pretty darn reliable. Curious what was done to yours when the head gasket job was done?
IIRC when we did the final review of all the work they said: "Oh hey, one of your injectors looks very slightly sketchy and one of your glow plugs looks like it might be done."

We decided that was work I could do on my own if I had issues down the road.
Also, the glow plug control module was toast and I just replaced that which is why I'm now seeing the error.

I'll just replace it and hope for the best. I'm not seeing anything weird WRT to the injector so I'm not worried about it for the time being.

My truck is just cresting 240k and I'm hoping to see it to 500k
GMC Sierra 2500hd 2004.5 now with ARP studs
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Old 08-28-2018, 08:23 AM
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More Power More Power is offline
Join Date: Feb 2000
Location: Big Sky Country
Posts: 10,504

Might not be a bad idea to ohm/continuity check the suspected bad plug to verify before doing much of anything. There have been instances of a bad wire or even a glow plug controller causing glow system codes. If that's the case, knowing now will give you time to consider the path forward before spending money. Jim
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glow plug

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