Problems with 08 Duramax - TheDieselGarage.com
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post #1 of 13 (permalink) Old 02-03-2009, 01:59 AM Thread Starter
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Problems with 08 Duramax

Friend is looking to buy a 2008 GMC Duramax 2500 crew, 4x4 auto. Are there any problem areas that he should know about? Thank you for the input
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post #2 of 13 (permalink) Old 02-03-2009, 10:48 AM
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I have an 07.5 and not a single problem. I think as long as he drives it hard once in a while he will have no issues.

Life changes, so roll with it, not against it.
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post #3 of 13 (permalink) Old 02-03-2009, 07:12 PM
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I've officially had my 08 for a month now, have over 3500 problem free miles on it!

I will say i'm not a HUGE fan of the electronic 4x4...the shifter covers the light saying if you're in 2 or 4 it doesn't display that up on the dash like my dodge did.... there is also the fact that its a pain in the butt to change a fuel filter, so that's now my mechanic's job not mine anymore.

Those being the only 2 things but i'd buy one again in a heart beat!
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post #4 of 13 (permalink) Old 02-03-2009, 08:14 PM
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From what I've heard, the 08 Dmax is pretty damn good, aside from less fuel mileage than the LBZ, but that's to be expected with the emissions that all of the big 3 have to meet. I just can't bring myself to embrace the new body style. I really liked the 01-06 look a lot more, but I could drive the GMC, as long as it has the work truck interior package.

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post #5 of 13 (permalink) Old 02-05-2009, 01:56 AM
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08 with over 30,000 miles. Wouldn't buy any other truck!
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post #6 of 13 (permalink) Old 02-05-2009, 12:16 PM
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I have had mine 14 Months now and not a Single Issue, I Love it!

2007 Silverado 2500 HD Ext Cab SB - Black Ext/ Black Int / LMM Diesel
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post #7 of 13 (permalink) Old 03-13-2009, 02:59 PM
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so i guess nobody has heard or had any problems with the 08' LMM cutting out or "coughing" at low RPM in 4th, 5th, or 6th gear. it does it to me when i am pulling a trailer or when i lean into the peddle
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post #8 of 13 (permalink) Old 03-13-2009, 03:06 PM
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looking for any suggestions as what to look at. i run a PPE hot tunner and open exhaust, PPE told me sounded like i was running out of fuel so i installed an airdog 150 liftpump. It helped hardly at all
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post #9 of 13 (permalink) Old 03-16-2009, 12:27 AM
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try either turning your tuner down or unplugging it all together, it sounds like its running out of fuel but w/ a big lift pump then i'd lean towards the PPE being the cluprit.

although.....you might have already fried the injection pump (i'm a dodge boy, don't know much about these Chevy's yet, but if it was a dodge i'd say injection pump so you might want to look into that, too bad its not under waranty probably with the PPE installed)

let us know how things go
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post #10 of 13 (permalink) Old 03-16-2009, 04:25 AM
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though not covered by warranty i had the dealership check out the injection pump and they said it was ok... i have turned down the chip to the lowest stage and still had the problems with the DPF deleted i am nervous about running the truck for very long with out the chip installed as you know it is what shuts off the regeneration. i have talked to PPE and they said they would talk to their techs and get back too me but that was two weeks ago. unless there is a flaw in the particular batch of chip i got i have my doubts the it is PPE's fault beause though not as bad my brother has the exac same setup as i do and also the same problems, but not quite as bad.

I have read about lots of other people running the same equipment as me but dont seem to have the problems, are there some tranny mods that is sould do or something? I am at a loss
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