DEF warning will not go out
Thread Starter
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
DEF warning will not go out
OK so I have searched this problem and seen where some have vapor locked or whatever. Tried banging on the tank squeezing the hose etc. Last time warning came on I pulled in and tried to fill it up and it only took between 2 and 2.5 gallons. However the warning went away. This time same thing I know it has not been long enough for another fill maybe 2k miles. So I pulled in again and got just under two gallons in it. Warning did not go out came home got on here and learned about above mentioned problem and solutions so went to Wal Mart and got a bottle. Tried to force feed it while tapping on tank and squezzing hose but probably not even a half gallon and still have the warning. I drive alot so the 455 miles I have left wont last me long. I picked it up 10/23 with30 miles on it and I am right at 30k now. So am I stuck going to the stealership?
thank you everyone
thank you everyone
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
Mine sometimes takes two or three restarts before the warning goes out. Last time it did this it took over 100 miles and three restarts to go out.
It's stupid little crap like this that really ticks me off about my truck.
It's stupid little crap like this that really ticks me off about my truck.
Thread Starter
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
I have restarted it several times.
My issue is not only is it not going out but when it comes on I can only fit 2.5 gallons max in the tank. This has happened the last to times now.
Super Moderator
Joined: Aug 2008
Posts: 37,379
Likes: 1,863
From: Frederick, MD
you might try to get the ford fill spout. It will work with the blue def jugs as well.
It is made to seal properly and also to vent so the **** water will go into the tank.
When full the container level that you are holding will not move so you know that it is full.
It is made to seal properly and also to vent so the **** water will go into the tank.
When full the container level that you are holding will not move so you know that it is full.
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
The level sensor is part of the DEF temp sensor/heater assembly.
Been a lot of these go bad on these trucks, replaced mine not too long ago.
Thread Starter
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
thanks to all
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
My truck is also my "money maker" but I usually do about 675 miles a DAY when I'm working. 
The real kicker on it was when the EGT sensor went belly up and left me on the side of the road with a 37' 5th wheel hooked to it. Big tow bill and shop bill to diagnose and replace a $54 part.
The real kicker on it was when the EGT sensor went belly up and left me on the side of the road with a 37' 5th wheel hooked to it. Big tow bill and shop bill to diagnose and replace a $54 part.
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Posting Guru
Joined: Apr 2011
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All these useless things like DEF and exhaust temp sensor that malfunction and leave you stranded. You know how they said the 20th century is the American Century. Guess what, the 20th century is over and so is America. Cant build a pipeline and they say with all the regulations they couldn't build the Golden Gate Bridge today.
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Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
Likes: 4
From: Connecticut
What I also do is do it in my garage when its quiet to listen to the fluid getting closer up the fill neck.Just added some today but I couldnt fit the last 2 pints in!Full
Laughing Gas
Joined: Jul 2010
Posts: 1,155
Likes: 31
From: Idaho
Got to be a bad sensor
I refill when it hits have way and that just about 2.5 gallons and I have not seen a count down ever. You are filling it all the way. So one or more sensor are bad. I think they are the same crappy sensor I have in my trailer.
Senior User
Joined: Nov 2004
Posts: 183
Likes: 0
From: Denton, MD
I was just about to post the same thing!! Added a jug about 2 weeks ago after getting message. I only put about 2k miles on it then I get the message again wjhile towing my 5th wheel. Thinking that maybe it just sucked it down, I went to Walmart and got two new boxes and after the first one went in, it was full.....looks like I'll be headed into the dealer!! Only 21k on the clock, they'll be fixing it!!
Super Moderator
Joined: Aug 2008
Posts: 37,379
Likes: 1,863
From: Frederick, MD
The ford spout has the best seal. I rinse it and reuse.
Thread Starter
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Laughing Gas
Joined: Apr 2007
Posts: 1,238
Likes: 2
From: North Port, Florida
Well went by the dealer this morning and made arrangements to drop off in the morning. Warning was still on, but after I stopped and filed the diesel tank. The warning went out. Guess we wil see what happens.
Official Ford Rep
Joined: Oct 2010
Posts: 3,123
Likes: 6
Be sure to let us know how things go at your dealerships. Once you've had your truck inspected, I'll be able to check out ways to help, if needed.
Crystal