DEF use
Thread Starter
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
DEF use
I am 600 miles from home and noticed that my display says my DEF is below half full. Would I be able to make it home before I have to fill it up or should I just find an AutoZone and do it. I'm not pulling anything so I'm not using extra. I truck came with a 5 year maintenance plan which includes filling up the DEF tank so I was hoping to get to the dealer before having to fill it. Will it go into limp mode if it runs out? This is my first truck with DEF and I've only had it for a few weeks so this is new territory for me. What do you guys think?
Senior User
Joined: Aug 2015
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I wouldn't worry too much about it. I think it will give you another warning before you get close to limp mode. Does your trip home not take you near any major stores like auto zone, wal mart etc where you could get some if needed? Any idea how long its been below half. DEF is cheap.
Thread Starter
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
I wouldn't worry too much about it. I think it will give you another warning before you get close to limp mode. Does your trip home not take you near any major stores like auto zone, wal mart etc where you could get some if needed? Any idea how long its been below half. DEF is cheap.
Senior User
Joined: Jul 2013
Posts: 302
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From: California
It will give additional warnings. I know that it will give a 500 mile warning on the 'productivity screen' that you need to clear.
It will also give more warnings as it gets closer to zero but I don't know what the mileage triggers are.
If you look in your diesel supplement, it will tell you the info.
I wouldn't be worried about it. You can buy DEF pretty much anywhere these days.
It will also give more warnings as it gets closer to zero but I don't know what the mileage triggers are.
If you look in your diesel supplement, it will tell you the info.
I wouldn't be worried about it. You can buy DEF pretty much anywhere these days.
Senior User
Joined: Aug 2015
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You will get a 500 mile warning. Then a 200 mile. At some point when you get closer to empty it will begin a countdown. So, you have plenty of warning giving you lots of time to get DEF. On mine the display simply tells me "below half full".
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Super Moderator
Joined: Aug 2008
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From: Frederick, MD
don't bother, drive it home. you have along time before it will need to be filled.
Too many warnings to even begin to worry about running out.
Only way you even knew it was below half was because you will checking.
Too many warnings to even begin to worry about running out.
Only way you even knew it was below half was because you will checking.
Lead Driver
Joined: Dec 2013
Posts: 9,762
Likes: 115
I got that on my way down from Alaska... At the next hotel I dumped my 2.5 gal jug in and then it went back up to DEF level Full. I topped off about 1,000 miles later when I happened to stop at a fuel station that sold DEF at the pump and refilled my 2.5 gal jug. Granted, I still have another potential 10k miles to drive before I make it back home...
I get wanting to take advantage of the maintenance plan you bought too... So I'd probably try to make it back unless I missed it and you have 3k miles to get home.
I get wanting to take advantage of the maintenance plan you bought too... So I'd probably try to make it back unless I missed it and you have 3k miles to get home.
Thread Starter
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Cargo Master
Joined: Feb 2008
Posts: 2,862
Likes: 44
From: Tooele, UT
thanks for all the help guys
Lead Driver
Joined: Dec 2013
Posts: 9,762
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2 things, try filling it again after a drive and make sure you are filling on level ground.
second, sometimes it takes a few drive cycles to reset.
If After that you are still in the countdown to walking, you may have to get the system reset by the dealer, uunless we now have a way to do it with forscan that I'm unaware of.
second, sometimes it takes a few drive cycles to reset.
If After that you are still in the countdown to walking, you may have to get the system reset by the dealer, uunless we now have a way to do it with forscan that I'm unaware of.