DEF excessive consumption - Dodge Cummins Diesel Forum
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post #1 of 54 (permalink) Old 07-02-2019, 09:09 AM Thread Starter
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DEF excessive consumption

Has anyone noticed the ungodly amount of DEF the new 3500s burn through? My 2016 2500 would last forever. I'm not happy with how fast this thing goes through DEF so far. I'm at 5k and have used 10 gallons so far.

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post #2 of 54 (permalink) Old 07-02-2019, 09:23 AM
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Are you towing/loaded most of the time? I've got 9k on my 2018 2500 and have been through 4 gallons, 2 of them when I towed the camper 1000 miles a few weeks ago.

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post #3 of 54 (permalink) Old 07-02-2019, 10:31 AM
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I've read that there is an ecm update that fixes the high def usage. Post #28

https://www.cumminsforum.com/forum/2...2502429?page=3

'14 3500 SLT CCLB SRW 68RFE 3.42
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post #4 of 54 (permalink) Old 07-03-2019, 02:16 AM
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I'm at 1600 miles on my 2019 Ram 3500 Mega with the HO / Aisin. I've pulled my toy hauler for about 400 of those miles and already had to refill the DEF tank today. This isn't going to be acceptable at all. The truck I traded in went 10k on a tank of DEF with the same toy hauler behind it.

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post #5 of 54 (permalink) Old 07-05-2019, 03:59 PM
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I like the fact she drinks it

90% of the DEF problems are because itís old, corroded and no longer performs to spec. If I have to have a DEF system I would rather cycle it quickly than let it sit and turn to garbage


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post #6 of 54 (permalink) Old 07-14-2019, 09:33 AM
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I've noticed mine uses more than my 2500s ever did. I was thinking that it might improve after some more miles. I currently have 3000 miles on it. About 2000 of those are towing. I have used 1.5 tanks of DEF

2019 Ram 3500 Dually Mega 6.7 4x4

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post #7 of 54 (permalink) Old 07-14-2019, 11:09 AM
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you should compare it to fuel gallons used...not miles. I was towing my 12,000 lbs. high profile 5th wheel up I 70 with a 20 mph headwind...fuel consumption with 6.7 MPG and is was using a bunch of DEF. The DEF usage should follow the fuel used...for the most part. The lower the MPG the more DEF used.

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post #8 of 54 (permalink) Old 07-14-2019, 12:31 PM
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I've been getting 300 - 350 mpg to go with the low mileage on my '17 3500, but both seems to be improving.

Maybe if we start telling people that the brain is an app, they will start using it?

'14 1500 V6, '17 3500 C&C, plus a '19 3500 6.4 in the household.
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post #9 of 54 (permalink) Old 07-14-2019, 07:23 PM
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Quote:
Originally Posted by Jimmy N. View Post
I've been getting 300 - 350 mpg to go with the low mileage on my '17 3500, but both seems to be improving.
Are you sure on your numbers?

That is entirely low.....for a 3500 riding on 17’s.

From TDR...
https://www.turbodieselregister.com/...3#post-2595271

Some updated DEF stats from my 2018 RAM 4500.....
142,891.2 miles logged
331.841 gallons of DEF purchased
$928.12 dollars
430.602 avg mpg DEF
10.33 avg mpg over lifetime of truck
$0.00649529 per mile in DEF costs
Or.....easier to understand...$6.49 per 1,000 miles driven in DEF costs
100% of DEF has been bulk at the pump
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post #10 of 54 (permalink) Old 07-14-2019, 07:54 PM
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Quote:
Originally Posted by gsbrockman View Post
Are you sure on your numbers?

That is entirely low.....for a 3500 riding on 17ís.
Not perfectly sure, no. On the latest trip it used about a third of what I had expected, and I haven't filled the tank up to be able to get good numbers since.

So, I posted the most recent numbers I had. Which would be low even for a 5500 on 44s, I think.

Maybe if we start telling people that the brain is an app, they will start using it?

'14 1500 V6, '17 3500 C&C, plus a '19 3500 6.4 in the household.
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post #11 of 54 (permalink) Old 07-14-2019, 10:28 PM
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Mine used practically nothing until I started towing 15k dump trailer a bunch. Then it started using quite a bit. I've got about 4k on it so far (2k miles with the loaded dump on it) and my I think I've gone though almost 2 tankfuls of DEF. What's in a tank. 5 gallons? Or 8?

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post #12 of 54 (permalink) Old 07-14-2019, 10:31 PM
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Quote:
Originally Posted by esminbritt View Post
What's in a tank. 5 gallons? Or 8?
A C&C is nine, a pickup is five, I think.

Maybe if we start telling people that the brain is an app, they will start using it?

'14 1500 V6, '17 3500 C&C, plus a '19 3500 6.4 in the household.
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