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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 06-05-2009, 11:31 AM   #1 (permalink)
WHISTLER.06
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Glow Plug Failure

hey my truck threw a code : glow plug # 4 circuit failure. truck has 87,000 mls. what would cause this, has anybody had this prob. it should be covered under warranty rite. any advice appreciated. thanks jeffro. should i have them replace them all. an under waranty.

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Old 06-05-2009, 11:48 AM   #2 (permalink)
leetSteve
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There was a recall on glowplugs....06 was included in that. I think it addressed that issue. I just had mine done at 75k.

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Old 06-05-2009, 12:07 PM   #3 (permalink)
dmaxatheart2
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Quote:
Originally Posted by WHISTLER.06 View Post
hey my truck threw a code : glow plug # 4 circuit failure. truck has 87,000 mls. what would cause this, has anybody had this prob. it should be covered under warranty rite. any advice appreciated. thanks jeffro. should i have them replace them all. an under waranty.
It could be one of two things, (1) you need to have your GPCM re-programmed because of the '06 issue, or (2) your plug connector might just be corroded. I recently had that problem with mine, it through the code P0678. I went to undo the connector on the end and the thread post and ground nut snapped off, with hardly any pressure. The nut and threads were so rusted, they looked like they had been welded together! The rust caused a bad connection. Just replaced the whole side.
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