DEF Advisory Message
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Junior User
Joined: Oct 2004
Posts: 57
Likes: 0
From: Santa Clarita, CA
DEF Advisory Message
At 3993 miles, I got the "Exhaust Fluid Range, 799 Miles" message.
At 4274, I added 2 1/2 gals of DEF. At the next start-up, I got, "Exhaust Fluid Range 800 Miles". I'd hope 2 1/2 gals. of DEF would be worth more than 800 miles.
The system recognized additional fluid, but didn't give me credit for 2 1/2 gals.
Currently, the system says I have 492 miles remaining (this from the 800 it gave me after adding 2 1/2 gals). So..If no more fluid is added, will the system shut down at the end of the 492 miles, even though there is 1 1/2 +/- gals left?
Just wondering....
At 4274, I added 2 1/2 gals of DEF. At the next start-up, I got, "Exhaust Fluid Range 800 Miles". I'd hope 2 1/2 gals. of DEF would be worth more than 800 miles.
The system recognized additional fluid, but didn't give me credit for 2 1/2 gals.
Currently, the system says I have 492 miles remaining (this from the 800 it gave me after adding 2 1/2 gals). So..If no more fluid is added, will the system shut down at the end of the 492 miles, even though there is 1 1/2 +/- gals left?
Just wondering....
Junior User
Joined: Dec 2006
Posts: 70
Likes: 0
From: nj
yes your truck will go into limp mode if you do not add more def. you need to fill the tank more then half for it to reset. read abound their are a bunch of threads about this. also its best to use fords filler spout as it will not let you over fill the tank
Freshman User
Joined: Sep 2010
Posts: 44
Likes: 0
From: Mont Belvieu, TX
DEF
How much is the ford DEF for 2 1/2 gallons?
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
Diesel tech at my local dealer is having the exact same issue. He had a 6.7 in his bay doing the exact same thing, customer added 2.5 gal to a DEF tank that was showing less than 500 miles to E. System did not reset itself and the countdown to E is still running even though there is at least 3 gal in the tank.
My Tech friend called me Fri afternoon to ask if I had seen any other issues like this, I told him no, but now on Mon I can call him and say yes!. He plans on first filling the tank all the way, then troubleshoot the system. Progress will be made in this issue.
My Tech friend called me Fri afternoon to ask if I had seen any other issues like this, I told him no, but now on Mon I can call him and say yes!. He plans on first filling the tank all the way, then troubleshoot the system. Progress will be made in this issue.
Postmaster
Joined: Sep 2006
Posts: 2,598
Likes: 5
From: Maryland
It seems that you really need to fill the tank 100% once you get the 800 mile message in order to reset the system. In my opinion it's a poor design, but is it really going to kill us to just fill the darned thing up if that's what it takes to make it work properly?
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
Ya, I know. I would never leave the tank partially empty, I always fill it with as much as it will take. It's probably the trick but eliminating a possible bad sending unit is important because it will shut the truck down eventually. At least, that's the way dealer mechanics have to work.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 738
From: Isanti, MN
I am planning on partial fill ups!
I figure it's a 5-gallon tank, and I don't want to spill the stuff everywhere. I'm thinking that once it gets to the "below half way" point I'll add 2.5 gallons and call it good until it shows under half again.
This time is the exception because the first one is free. Planning on running down to ~10 miles to empty!
I figure it's a 5-gallon tank, and I don't want to spill the stuff everywhere. I'm thinking that once it gets to the "below half way" point I'll add 2.5 gallons and call it good until it shows under half again.
This time is the exception because the first one is free. Planning on running down to ~10 miles to empty!
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Postmaster
Joined: Apr 2009
Posts: 3,839
Likes: 2
I refill mine at the earliest convenient opportunity after I see it is under 1/2 full. I have used the Blue DEF from O'Reillys twice and their spout works fine. I have refilled at the Pilot I go by when I travel to Indy. There dispenser DEF was $ 2.79 a gallon. I took a fuel can with me and bought 3 gallons for the road. I have never seen the 800 mile warning, doubt I will.
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Senior User
Joined: Sep 2010
Posts: 421
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From: League City, TX
I am planning on partial fill ups!
I figure it's a 5-gallon tank, and I don't want to spill the stuff everywhere. I'm thinking that once it gets to the "below half way" point I'll add 2.5 gallons and call it good until it shows under half again.
This time is the exception because the first one is free. Planning on running down to ~10 miles to empty!
I figure it's a 5-gallon tank, and I don't want to spill the stuff everywhere. I'm thinking that once it gets to the "below half way" point I'll add 2.5 gallons and call it good until it shows under half again.
This time is the exception because the first one is free. Planning on running down to ~10 miles to empty!
But I noticed that if any of the fluid remains in the nozzle or any place it can dry out -- it crystalizes. So, next time I am probably going to wait an extra 500 miles before refilling. Or I guess I could just rinse everything off real well, but I didn't like the fluid coming out of the fill tube.
Fleet Mechanic
Joined: Feb 2010
Posts: 1,446
Likes: 28
From: Hot Springs
I think I read where this issue is corrected in the latest update.
"The diesel exhaust fluid (DEF) warning messages won't reset after refilling DEF tank with key on engine running (KOER), malfunction indicator light (MIL) on with diagnostic trouble code (DTC) P2459, P2463 and/or P246C for diesel particulate filter (DPF) restrictions"
"The diesel exhaust fluid (DEF) warning messages won't reset after refilling DEF tank with key on engine running (KOER), malfunction indicator light (MIL) on with diagnostic trouble code (DTC) P2459, P2463 and/or P246C for diesel particulate filter (DPF) restrictions"
Postmaster
Joined: Apr 2009
Posts: 3,839
Likes: 2
No readout as to injection activities nor is one really needed. It is a computer controlled event and how often and how much depends on several operating conditions. Heavy loads and hard use sucks up more DEF. I get about 1200 miles out of a gallon of DEF. That appears to be about average consumption. It is not the same as the DPF system which does let you know when it begins a regeneration cycle.
Regards
Regards
Post Fiend
Joined: Jan 2009
Posts: 6,521
Likes: 11
From: Greenwood, SC
I just got off the phone with the diesel tech I know, he spoke with a Ford engineer and here is the solution:
When the DEF tank is depleted enough to display the "800 miles to E" message and begin the countdown, it is mandatory to add a minimum of 3.5 gallons to the tank for the warning system to reset.
When the DEF tank is depleted enough to display the "800 miles to E" message and begin the countdown, it is mandatory to add a minimum of 3.5 gallons to the tank for the warning system to reset.