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Old 08-06-2016, 04:21 PM   #1
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Thinking about going back to gas

I am thinking about a new truck because I am having trouble with the DEF on my 2011 Chevy Duramax. It has 60900 miles and has been in the shop every 75 - 125 miles 6 times. Every time the shop says they can't find anything wrong even with the check engine or def light are still on in the dash. I tried 2 Chevy dealers. One did a re-gen even thou he said it did not need it. Another re-programmed the computer. On a different note the transmission shift module went out as we were leaving for a month long trip lucky for us we were 17 miles from home. All the trouble has been with in 5 weeks. still no trip!!!! Has anyone else had this problem? If so what did the shop do to fix it? Is this a Chevy problem or does Ford and Ram have the same trouble?
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Old 08-06-2016, 04:37 PM   #2
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While I can't speak to your particular issue,There is no doubt that the emissions systems on the new trucks are sometimes problematic, it is well documented. I really think people are having some issues across all truck brands, (big rigs included) when it comes to the new environmental regulations.

If you don't need the torque of a diesel engine I think that the newer gas engines are a good choice. I used to have an F250 with a 6.2 gas engine and found it to be a strong workhorse and no DEF required.

Kind of a choice you need to make. DEF and emission control systems aren't going to be going away anytime soon.
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Old 08-06-2016, 05:00 PM   #3
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I have had zero issues with the DEF systems on 2 trucks so far. There are some things about the sensors you may not know that might help you out. For example if you add a gallon of DEF fluid to an almost empty tank the computer most likely will not reset and a countdown to shut down will continue. The only way to add to the tank is to fill it up all the way to the top and then drive it until it gets the full signal. I have owned 2 of these truck now and both of them had this quirk in the system, it's not a real problem once you understand it.

If I had your truck I would keep it. You will never pull anything like a diesel pulls it.
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Old 08-06-2016, 06:10 PM   #4
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Like stated above it is a problem no matter the brand. One little sensor misfire and the whole system goes bat excrement crazy. I have had 0 issues on two Sprinters 85k miles but other Sprinter users have. Some wait till the countdown timer shows before they re-fill which seems to lead to problems. One theory is the fluid gets below the first sensor and dries and crusts up over time sending an error back to the computer. I fill mine after the first warning. DEF also has a shelf life. Buy from stores with high turnover. In ground systems like at truck stops seem to be reliable but to me too many things could go wrong so I stay away from them if possible. MB suggests evacuate and refill DEF tank every year or every 2 years. Excess idling can cause the system to clog up from what I read but who knows.
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Old 08-06-2016, 09:44 PM   #5
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[QUOTE=eldermike For example if you add a gallon of DEF fluid to an almost empty tank the computer most likely will not reset and a countdown to shut down will continue. The only way to add to the tank is to fill it up all the way to the top and then drive it until it gets the full signal.

My VW Touareg TDI is the same way and if you add DEF at exactly every 10K you'll have no problems. I burn 2.5 gal. Every 10 K.
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Old 08-06-2016, 10:57 PM   #6
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I have not had any issues with the DEF fluid, but I have had issues with the DPF/regen. I have had two occurrences where my truck said the DPF was saturated/overlimit. The first time, it happened between Roswell and Albuquerque, when the truck had 6000miles. Truck went into "limp mode" and I had to drive 40 miles at 20mph with my trailer attached.
Second time was about two weeks ago on highway 50 in Nevada. Between I80 and Ely. Luckily the second time the truck did not go into limp mode. I was able to get it to perform the regen by dropping down into 3rd/4th gear and driving with the engine at 2500-3000rpms for about an hour.
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Old 08-07-2016, 04:03 AM   #7
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I've been seriously thinking of going diesel for two years, but stayed with gas....., decided to keep my future towables within the capabilities of a gasser.

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Old 08-07-2016, 06:37 AM   #8
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I switched from diesel (2010 RAM 2500 CTD) to a gasser (2011 RAM 1500 5.7 Hemi). Towing my 26BH I get the same MPGs with the Hemi as the Cummins, and unloaded the Hemi beats the CTD quite a bit. Maintenance costs for my gasser are quite a bit less than the diesel, not to mention the high potential repair costs of the diesel. Even though I miss the big truck stability of the CTD, the Hemi pulls my TT just fine. I'm glad I switched.
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Old 08-07-2016, 07:11 AM   #9
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Post your issue on the Duramax Forum. Lots of help there. Sounds like it could be as simple as a NOX sensor, easy inexpensive fix.
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Old 08-07-2016, 07:52 AM   #10
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My main problem is a "poor def quality" then check engine light comes on. Came on again yesterday for 50 or so miles then went off. I keep my def tank full sometime only added a quart at a time. I now only buy def from the GM dealer $8 a gallon because they started saying Blue Def was bad. I asked the dealer about the senors being bad they said if it don't throw a senor code they won't change the senors.
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