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Old 05-26-2014, 07:33 PM   #21
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DPF is under the truck.

https://www.google.com/search?q=dura...w=1366&bih=712
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Old 05-26-2014, 07:33 PM   #22
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2007.5 is when the started the new body style.Lmm is name for your motor.
Lb7.lly.lbz lmm.lml are all gm.diesel engines
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Old 05-26-2014, 07:34 PM   #23
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No separate section.
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Old 05-26-2014, 07:40 PM   #24
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Without checking any codes DPF sounds like a high probability. I will have to take it in to the shop tomorrow and get it looked at. thanks for everyones help.
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Old 05-26-2014, 07:40 PM   #25
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I believe it is back by the tail cone.
There should be a diesel fuel line going to it.


2010 Duramax LMM Turbo Diesel DPF Diesel Particulate Filter Exhaust GM | eBay

I know that was for the 2010, but it looks kinda like that.

http://www.ehow.com/how_8561954_clea...l-duramax.html
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Old 05-26-2014, 08:05 PM   #26
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If it is an 08 it absolutley has a DPF and if there was an issue with the DPF the dashboard display would state "Clean exhaust filter" if it were a clogged DPF due to non completion of regen cycles. I would change the fuel filter as suggested and then if that does not work get the code checked. As stated earlier your shooting blind otherwise.
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Old 05-26-2014, 08:08 PM   #27
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could be a multitude of issues, take the truck to a auto parts store and pull the code, or codes. could be the DPF,low rail pressure , MAF, trans,.ect...the list can go on and on that all cause reduced power. But with out the code everyone is just speculating..
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Old 05-26-2014, 09:19 PM   #28
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I'm comparing apples to oranges here, but my gas 2011 Silverado had a similar issue. Was the throttle position sensor.

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Old 05-26-2014, 10:22 PM   #29
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Just sayin'

Mine is an 08 Duramax.

Had the exact same error.

Codes showed clogged EGR valve and intake air restriction confirmed by diagnostic run by OnStar.

Solution by GMC dealer was to drop the camper in his yard; drive it back onto the highway to the next exit and back.

By the time I got back it was running great; hooked back up and continued to Florida for 2 months of trouble free driving. Total cost out of pocket - zero.
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Old 05-26-2014, 11:06 PM   #30
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Herk that sure sounds to me like a remedy for a DPF issue and not the EGR. When the DPF does not complete a regen cycle to clean itself of accumulated soot the prescription is to drive it on the highway. Regen is put on hold under 35 mph in these trucks hence the highway driving needed. After a few failed attempts the "Clean exhaust filter" message can appear.
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