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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 02-22-2015, 01:15 PM   #11 (permalink)
alboy
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Just curious are these failures more prevalent on the 2011/13 trucks or has it been across the board.

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Old 02-22-2015, 01:29 PM   #12 (permalink)
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Im not 100% sure. But i think it has only been on 2011 and newer due it being the new CP4. But mainly the 11's and 12's. There hasn't been many just a few. I haven't heard of a pin pointed out reason as to why these few have failed. Other then defective. Maybe bad Fuel, Not using proper additive, or because of abusing the CP4 to well over its capabilities.

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Old 02-22-2015, 01:38 PM   #13 (permalink)
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The thing about Modding a truck or any vehicle for that matter is every part of the engine has its limits. With doing upgrade to these trucks. Deleting the emission, adding a tuner that increases the fuel % to the injectors can over-work a CP4. Since there is no fuel pump that pump is working overtime to suck the fuel from the tank. Adding a lift pump simply aids the CP4. Depending on the end goal of your truck will determine whether or not the factory CP4 should be upgraded or converted to the Cp3.
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Old 02-22-2015, 02:20 PM   #14 (permalink)
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My end goal for the truck is to have a reliable vehicle to keep for a long time. I'll pull my 5er and that's about it. Mostly a DD
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Old 02-22-2015, 02:56 PM   #15 (permalink)
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Thats my end goal! I will hopefully within a few years have a nice camper to haul around. But Id say since you got the OK from the wife. Pull that trigger. I think am going to go with the FASS150. Just because i am tuned and do plan on doing some more mods in the future. and this way i am already covered for those future upgrades
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Old 02-22-2015, 02:58 PM   #16 (permalink)
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I'm also looking at the air dog ii 165. I really like the no drill install of the titanium though, and that will (as dumb as it sounds) probably be the deciding factor
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Old 02-22-2015, 03:01 PM   #17 (permalink)
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Yea i do like the Air Dog. Especially since they have the quick disconnect for the duramax. Definitely makes the job easier. I was unaware of the no drill install from the titanium. Ill have to check that out again.
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Old 02-22-2015, 03:02 PM   #18 (permalink)
Doodle
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Quote:
Originally Posted by rob1 View Post
At my dealer we have only had 2 fail requiring fuel system replacements and another one that wouldn't build pressure - just a bad pump no major failure. We sell and service lots of diesels so I don't think it's as common as what the Internet makes it look like.

What is interesting is that I have read where Canadian blended fuel has more additives and a lower SCAR rating compared to American blended fuel, hence failures have been less common up north. Don't know if there is any truth to that or not.

One thing I can't seem to nail down is that supposedly the 2015 pickups have an "updated" CP4 but I haven't been able to determine what the update is or whether the update is even true? In addition I can't remember where I saw this but I thought I read that someone with a new 2015 has had a failure. However, most of the failures I have read about have been the 2011-2012 models. That would tend to make more sense as those theoretically should have more miles.
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Old 02-22-2015, 03:19 PM   #19 (permalink)
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That is interesting Doodle! I'll have to research for this "updated CP4". I'd be interested in knowing what the update is and it if it something that could be available for the 2011-2014 models. You would think after 4-5 years of these new CP4 pumps being in the newer trucks they would have some clue or idea of what exactly is causing the rare few to fail.
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2003 Silverado Z71--SOLD
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Old 02-22-2015, 05:07 PM   #20 (permalink)
Doodle
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I'm not expert, but I think the failures are primarily due to the higher pressures the Cp4 runs at and the the lower tolerance for any contamination (i.e. water) in the fuel. So if you get bad fuel and don't have good filtration, pump life could be comprimised. I read somewhere that Bosch only warranties the Cp4 for like 1000 hours. That is a bit misleading because some have tanken it like it has a service life of only 1000 hours. However, I would suspect that service life for the Cp4 won't be nearly as long as the more reliable Cp3. That is why there are some doing conversions. At the end of the day sometimes you just have to play the law of averages and figure with good maintainance you are unlikely to have issues with the Cp4 or convert it to the Cp3.

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