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Old 02-28-2014, 11:00 PM   #1
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2007 and newer Duramax problem.

FYI
I received this message from a fellow Crossroads owner about the 2007 and newer Diesels.


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Duramax Diesels 2007 and newer have a problem. The three bolts holding the muffler to the catalytic converter break due to the extreme heat when the exhaust system heats up to burn off pollutants in the converter. One person on the Duramax Forum on the internet had his go at 38k miles.

Just here in one campground I know of three trucks with the problem and we personally know of 4 others. Local GM in FT Mead, Florida;GM in Ellicott City; and National GM Customer Service all claim to no NUTHING. There are no bulletins or recalls but seven of us here can't be odd men out so check your muffler bolts.

When the bolts all fail--if you are lucky-- the muffler drops about halfway to the ground and leans over on the drive shaft which is not pleasant. Bolts and gasket cost about $50. The bolts have spleens on the heads and are tough to remove. You'll need heat. Propane helped but we had to drill them out. Acetylene may do better. There is some talk of using harder bolts. Also of using regular bolts without the spleen. That would make them easier to remove the next time they fail after the next 40k or so.
Problems can also be reported at http://www.nhtsa.gov/
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Old 02-28-2014, 11:21 PM   #2
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I saw that also, thanks for pulling it over here.
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Old 03-31-2014, 05:04 PM   #3
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Between this and several other recent, BIG recalls...I am losing faith in my GM products...

Maybe I should look at the 2004 Chevy 2500 I saw...older can be better, right?
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Old 03-31-2014, 05:36 PM   #4
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I put nearly 400,000 miles on my old duramax my newer one made it about 5k before it got lemoned.
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Old 03-31-2014, 06:54 PM   #5
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I searched the Duramax Forum and couldn't find it. I also searched NHTSA and couldn't find anything about it there either. The 2006 and early 2007 was the LBZ Duramax. Late 2007 - 2010 was the LMM Duramax. The current LML began in 2011. The exhaust is different on each one.
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Old 03-31-2014, 06:59 PM   #6
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I had a 2011 and a 2013 with no problem ...what gives?
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Old 04-06-2014, 07:42 AM   #7
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I been working for a Chev dealer for 18yrs and haven't seen this.
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Old 04-06-2014, 05:57 PM   #8
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I will be crawling under mine tomorrow..
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Old 04-06-2014, 08:12 PM   #9
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ewbldavis, I am hoping older is better!! I'm getting there quick!! SleepyT, I work with a 2011 Duramax 6.6. The owner had the exhaust assy replaced last October from catalytic to tail resonator due to a "falling out". Good luck.
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Old 04-06-2014, 08:25 PM   #10
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SleepyT. This is what could happen when you buy an off brand truck like a Chevy or Dodge.
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