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2013+ General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING

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Old 05-08-2013, 08:57 PM   #25 (permalink)
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Just added DEF for the first time today. Gauge was on the last line before "E". Right around 1900 miles. The gauge, as I discovered, is quite misleading. As another member posted, adding a gallon brought it almost to halfway, and the second gallon to about the three quarter mark. I put two more in (only bought four) and its still not what I'd call topped off. The gauge is over the full line though. Might grab another gallon to see how much more it'll take tomorrow.

So, for those of you watching your needles, it's not linear at all! Lol
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Old 05-09-2013, 12:23 AM   #26 (permalink)
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Originally Posted by mtday View Post
Just added DEF for the first time today. Gauge was on the last line before "E". Right around 1900 miles. The gauge, as I discovered, is quite misleading. As another member posted, adding a gallon brought it almost to halfway, and the second gallon to about the three quarter mark. I put two more in (only bought four) and its still not what I'd call topped off. The gauge is over the full line though. Might grab another gallon to see how much more it'll take tomorrow.

So, for those of you watching your needles, it's not linear at all! Lol
The level sensor for the DEF tanks are like a RV holding tank level sensor and work in increments so not a linear system like fuel tank sending units.
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Old 05-10-2013, 08:21 PM   #27 (permalink)
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I'm at 1,300 miles and my screen says my DEF system needs service and to contact the dealer. Dealer told me just to drive it hard for a bit? Anyone had something similar?
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Old 05-10-2013, 10:36 PM   #28 (permalink)
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I'm at 1,300 miles and my screen says my DEF system needs service and to contact the dealer. Dealer told me just to drive it hard for a bit? Anyone had something similar?
Does it say DEF needs service or DPF need service.? Driving it hard will heat up DPF and burn soot, and help that situation, however driving hard has nothing to do with the DEF system operation. Either way with that kind of mileage you should be having zero issues with both systems, you havent driven enough to fill the DPF yet, unless it is not performing an active regen. Nor have you driven enough to contaminate the Nox sensors( in exhaust stream) to give false readings for the DEF (SCR) not scrubbing Nox emissions. I suspect a faulty Nox sensor if it is the DEF message or a faulty pressure sensor if it is a DPF message.

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Old 05-11-2013, 01:43 AM   #29 (permalink)
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1300 city miles is PLENTY to cause DPF full problems. 300 miles in the city will do it..........
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Old 05-11-2013, 07:45 AM   #30 (permalink)
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My truck did a short regen yesterday at 275 miles. It only lasted about ten miles.
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Old 05-11-2013, 08:00 AM   #31 (permalink)
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1300 city miles is PLENTY to cause DPF full problems. 300 miles in the city will do it..........
Most of mine is highway but I do idle a few hours a day while I'm on locations but I do turn on my high idle.
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Old 05-11-2013, 08:05 AM   #32 (permalink)
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Does it say DEF needs service or DPF need service.? Driving it hard will heat up DPF and burn soot, and help that situation, however driving hard has nothing to do with the DEF system operation. Either way with that kind of mileage you should be having zero issues with both systems, you havent driven enough to fill the DPF yet, unless it is not performing an active regen. Nor have you driven enough to contaminate the Nox sensors( in exhaust stream) to give false readings for the DEF (SCR) not scrubbing Nox emissions. I suspect a faulty Nox sensor if it is the DEF message or a faulty pressure sensor if it is a DPF message.
"Service DEF System, contact dealer"
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Old 05-11-2013, 11:33 AM   #33 (permalink)
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1300 city miles is PLENTY to cause DPF full problems. 300 miles in the city will do it..........
If the truck is not regening properly , yes , DPF can plug as it can accumulate over 46 grams of soot in that period, i am assuming the regen process would be working on a brand new truck. This why i stated it is unlikely a DPF problem already.

I see that it it indeed a DEF issue anyway, so DPF is most likely properly doing an active regen.
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Old 05-11-2013, 11:38 AM   #34 (permalink)
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My truck did a short regen yesterday at 275 miles. It only lasted about ten miles.
Odd, the DEF equipped trucks should at least double regen intervals, and regen should be every 500 miles on average. Based on the average regen being 200 -250 miles pre DEF equipment .

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"Service DEF System, contact dealer"
Thanks for clarification. Do not let this message go unattended, as your truck will be limited to speed and power after a predetermined amount of miles driven without DEF working properly, and thank the EPA while your at it.
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Old 05-11-2013, 09:45 PM   #35 (permalink)
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I pulled a light load today (7k) for about 4 hours, message has gone away and all seems well.
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Old 05-11-2013, 11:39 PM   #36 (permalink)
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I pulled a light load today (7k) for about 4 hours, message has gone away and all seems well.
This is a good thing ,as long as the message or CEL is out it won't derate. It will keep a stored fault in mode 6 for further perusal if needed.
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