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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 LLY. Engine related discussion ONLY.

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Old 08-07-2019, 10:15 PM   #1 (permalink)
PorterLLYDirty1
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04.5 LLY Harness Problem

Hey guys got a question. My 04.5 Gmc Lly is still randomly throwing the injector group b supply code. I have already fixed the wires around the alternator and cleared the code with my insite cts2 screen. I cant seem to figure out what is wrong with it. It will just randomly throw the code going down ths road. Any help would be appreciated. Thanks!!

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Old 08-07-2019, 10:17 PM   #2 (permalink)
OkDually
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Welcome to DieselPlace
I moved your post over to"Duramax Second Generation: 2004.5-2005 (LLY) " for better responses to your issue



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Old 08-07-2019, 10:20 PM   #3 (permalink)
PorterLLYDirty1
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Ok cool thanks!
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Old 08-08-2019, 01:38 AM   #4 (permalink)
jake111
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People here would want to know the actual code(s)...

P2149? If so, there's usually a P020x code, and for P2149 most likely P0202. Many of us have suffered that one (I've only started 9 threads in 12 years, and this subject is one of them).

If so, there's the "ice pick" method, but some of us prefer to snip off and replace the injector connector.

Oh yeah, the problem is the metal connectors in the injector connectors loosen up and get an open circuit. Usually, it's either #2 (P0202) or #7 (P0207) because they have an unsupported loop and vibrate around more. But, it could happen to any of them.
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