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Old 08-07-2016, 08:35 AM   #11
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Last month on I-90 a little over 150 miles East of Ellensburg, WA we had the "Poor DEF Quality" followed by the"Check Engine" light messages. We made it into Ellensburg before it went into total limp mode. The Chevy dealer tried numerous "regens". When that didn't work they replaced the NOX sensor and another part that I don't recall but they could not clear the code no matter what they tried. They then replaced the entire exhaust system. Took them six days to get the parts but that took care of it. They speculated that there was a bad sensor that never sent the engine into regen mode and eventually the exhaust system was so gunked up that it could not be cleaned enough to clear the code. We had purchased the truck in May and all repairs were covered under warranty. It had about 63,000 miles on it when this occurred.
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Old 08-08-2016, 06:15 AM   #12
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My brother in law had the same type of issues. My husband has an F-250 diesel. Our understanding is that it has to do with the location of where the DEF gets mixed into the fuel. GM mixes theirs up front and Ford has theirs mix near the exhaust. I think My BIL doesn't really tow anything so he switched to an F-150 gas truck. We haven't had any issues with our 2011 f-250.


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Old 08-08-2016, 06:31 AM   #13
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DEF is one of the reasons I looked for an '07 or older truck when I bought mine.
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Old 08-08-2016, 03:45 PM   #14
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This is why I stay with a gas truck. I understand diesel and have owned big diesels Not in pickups. We simply cannot afford to have these kinds of issues with a $60k truck. If money was no object I'd probably buy diesels and trade them before the warranty is up. Until then Ill just down shift and keeper' wound up.
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Old 08-08-2016, 04:32 PM   #15
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If you live in a state that doesn't emissions test, I highly recommend deleting. My 14 Ram with a Cummins went in the shop twice for SCR problems. Third time it did it, deleted the EGR and SCR, didn't look back and end of problems. My new truck will be getting deleted the first time it throws a CEL for SCR system.
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Old 08-08-2016, 05:40 PM   #16
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for me I haven't had ant problems with my 2011 f250 but I wont let the def tank get below half again as I found out it had to be filled completely and driven a bit for the sensor to pick up ... I drive it mostly in town and some expressway and when doing a lot of in town driving it does an exhaust regen about every 200 miles
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Old 08-08-2016, 06:18 PM   #17
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Nothing like the torque from a diesel.... But it's gonna cost you!

I could replace my engine for what it costs to do a repair on a diesel!

Schooner, how much would that exhaust cost if it wasn't covered under warranty?
Plus all the other "diagnostics" hours they had into it?

It seems the whole EGR system is a mistake to me. Sending soot filled exhaust back into an engine to burn is wrong and it will cause problems.

The only way I could afford to have one is if I replaced it often enough to always be under warranty.
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Old 08-08-2016, 06:50 PM   #18
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Quote:
Originally Posted by RockSmasher View Post
If you live in a state that doesn't emissions test, I highly recommend deleting. My 14 Ram with a Cummins went in the shop twice for SCR problems. Third time it did it, deleted the EGR and SCR, didn't look back and end of problems. My new truck will be getting deleted the first time it throws a CEL for SCR system.

I agree. I'd delete it if they cant fix it. One of the main reasons I bought my '07 was because it was the last year before they started the DPF and I believe 2011 was first year for DPF and DEF. The newer ones don't have as many issues from what I read. Yours being an early one, again I'd just delete it... Like mentioned, you may get more info going to a duramax specific site.
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Old 08-11-2016, 09:29 AM   #19
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Quote:
Originally Posted by Jhowemca View Post
...snip...
It seems the whole EGR system is a mistake to me. Sending soot filled exhaust back into an engine to burn is wrong and it will cause problems.
Just to enlighten most folks....

EGR has been with us since the early 1970's gasoline engines.

By recirculating a portion of the exhaust gasses, the flame front is slowed down and combustion temperatures are reduced. High temperature burning of hydrocarbons in a nitrogen/oxygen atmosphere (we are on Earth, aren't we?) produces 'oxides of nitrogen' (NOX) which are highly reactive once they are released back into the atmosphere.

So the EGR system was developed as a way to reduce NOX emissions. It has proven very effective in gasoline engines.

However, since Diesels don't have a throttle plate, getting the semi-pressurized exhaust gasses into the intake manifold that has been pressurized by the turbocharger...can be problematic. Ask VW about their FAIL at it!
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Old 08-18-2016, 03:18 PM   #20
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Back to the shop again more DEF quality problem dealer said I had been use cheap and bad DEF till I said I buy it from this dealer, then he said it had to much water in it, I said I bought it from this dealer last week offered to show receipt, they cleared code said it is ready, showed again code before I got home (35 miles). The good news NO CHARGE
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