View Poll Results: What causes exhaust system fluid failure
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Exhaust fluid system failure
Thread Starter
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Freshman User
Joined: May 2018
Posts: 29
Likes: 0
Exhaust fluid system failure
So I was driving and I had exhaust system fluid failure warning come on. I have a 2015 f-250. What causes this and how to fix it. Says I have 50 miles till it will only go 50mph.
Cargo Master
Joined: Feb 2015
Posts: 2,338
Likes: 255
From: Livermore Ca.
Is the DEF full? If so when did you fill it? I had this happen to me but the error went away all; by itself. There is no way for you to clear the code. I don't think a code reader can do it ether. I would however if it gets close to limp mode take it to the dealer. Most of the time folks just do to much stop and go driving and don't let the regen finish. These trucks are made to work . They love to tow heavy loads. They are not much for getting the beer unless you buy lots of beer at a time. They don't like to be babied at all. Diesels are made to be driven. I don't hammer my 15 but I get it up to speed rather quickly. 80 seems to be the speed we drive here in Ca. Hope the truck fixes itself on it's own
Lead Driver
Joined: Jan 2010
Posts: 6,600
Likes: 84
Is the DEF full? If so when did you fill it? I had this happen to me but the error went away all; by itself. There is no way for you to clear the code. I don't think a code reader can do it ether. I would however if it gets close to limp mode take it to the dealer. Most of the time folks just do to much stop and go driving and don't let the regen finish. These trucks are made to work . They love to tow heavy loads. They are not much for getting the beer unless you buy lots of beer at a time. They don't like to be babied at all. Diesels are made to be driven. I don't hammer my 15 but I get it up to speed rather quickly. 80 seems to be the speed we drive here in Ca. Hope the truck fixes itself on it's own
Fleet Mechanic
Joined: May 2018
Posts: 1,765
Likes: 502
Is the DEF full? If so when did you fill it? I had this happen to me but the error went away all; by itself. There is no way for you to clear the code. I don't think a code reader can do it ether. I would however if it gets close to limp mode take it to the dealer. Most of the time folks just do to much stop and go driving and don't let the regen finish. These trucks are made to work . They love to tow heavy loads. They are not much for getting the beer unless you buy lots of beer at a time. They don't like to be babied at all. Diesels are made to be driven. I don't hammer my 15 but I get it up to speed rather quickly. 80 seems to be the speed we drive here in Ca. Hope the truck fixes itself on it's own
Cargo Master
Joined: Feb 2015
Posts: 2,338
Likes: 255
From: Livermore Ca.
I don't know about cars and suv's . I do know that trucks must be different because if you don't let the regen process complete enough the DPF will clog and then it's big money to fix. I have never visited the car diesel forum to know anything about them. After the Volkswagen debacle things may have changed for cars. I don't even know if cars use DEF. I do know our trucks and if you don't take care of the DPF it will cause you to push your truck a shop for repairs. Just saying. Those of you who have deleted your truck to avoid this you may just open a Pandora's box of other things that could go wrong with your truck.
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Tuned
Joined: May 2019
Posts: 279
Likes: 14
From: Brookings, SD
Like KPER said, get a scan tool and read the code. Otherwise, you'll just be guessing.
There will be a code of some sort indicating what triggered the def fault. Things like a failing SCR system, bad def injector, failed def pump can all lead to poor NOx conversion, which will trigger a Def fault. It could even be as simple as bad wiring. That happened to me when I replaced my def heater. The failed def heater istelf won't cause a def fault, unless its also below 12 F outside which will result in Poor NOx conversion, and then a DEF fault. But in my case, bad DEF tank heater, as I'm replacing the heater, I cycled the key on with the harness disconnected, and after about 20 seconds of the DEF tank harness being disconnected, I got a DEF fault for some circuit being out of range. This triggered the distance till 50MPH limp mode that I had to have cleared with the appropriate drive cycle once everything was fixed and reconnected.
So you CAN fix this yourself, if you have access to a scantool. An OBDII dongle and Forscan will suffice even, you just need to read the code so you know where to look.
There will be a code of some sort indicating what triggered the def fault. Things like a failing SCR system, bad def injector, failed def pump can all lead to poor NOx conversion, which will trigger a Def fault. It could even be as simple as bad wiring. That happened to me when I replaced my def heater. The failed def heater istelf won't cause a def fault, unless its also below 12 F outside which will result in Poor NOx conversion, and then a DEF fault. But in my case, bad DEF tank heater, as I'm replacing the heater, I cycled the key on with the harness disconnected, and after about 20 seconds of the DEF tank harness being disconnected, I got a DEF fault for some circuit being out of range. This triggered the distance till 50MPH limp mode that I had to have cleared with the appropriate drive cycle once everything was fixed and reconnected.
So you CAN fix this yourself, if you have access to a scantool. An OBDII dongle and Forscan will suffice even, you just need to read the code so you know where to look.
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Thread Starter
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Freshman User
Joined: May 2018
Posts: 29
Likes: 0
Just a quick update
I just want to say thanks to everyone that took the time and replied. Got a lot of good info. My code is gone. Let me just tell you a quick rundown of what happen. So I got the exhaust system fuel failed warning Friday driving home. Posted this Friday night.a few hours latter I tried just topping off the DEF tank. Which was very low. ( I never got the notice of CB 500 mile till empty which used ally happens) After topping off my DEF I posted this thread. Saturday called to get the truck in the shop. Couldn’t get it in till Tuesday morning. So I drove the truck till it went in limp mode and then continue to drive it for about 15-20 miles like that. And while driving the code cleared I was able to exceed the 50 mph. So thanks to everyone.
Tuned
Joined: May 2019
Posts: 279
Likes: 14
From: Brookings, SD
I just want to say thanks to everyone that took the time and replied. Got a lot of good info. My code is gone. Let me just tell you a quick rundown of what happen. So I got the exhaust system fuel failed warning Friday driving home. Posted this Friday night.a few hours latter I tried just topping off the DEF tank. Which was very low. ( I never got the notice of CB 500 mile till empty which used ally happens) After topping off my DEF I posted this thread. Saturday called to get the truck in the shop. Couldn’t get it in till Tuesday morning. So I drove the truck till it went in limp mode and then continue to drive it for about 15-20 miles like that. And while driving the code cleared I was able to exceed the 50 mph. So thanks to everyone.
Thread Starter
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Freshman User
Joined: May 2018
Posts: 29
Likes: 0
Exhaust system fluid failure
That’s a damn good idea. Cause I just a call back from the dealership. They are saying $1003 to replace the pump. I found the pump on line from a ford dealership in I think Oklahoma for $250 and it does look to hard to diy. Seeing how it seems to be on top of the tank. But still a good idea to find out what the code was.
Tuned
Joined: May 2019
Posts: 279
Likes: 14
From: Brookings, SD
That’s a damn good idea. Cause I just a call back from the dealership. They are saying $1003 to replace the pump. I found the pump on line from a ford dealership in I think Oklahoma for $250 and it does look to hard to diy. Seeing how it seems to be on top of the tank. But still a good idea to find out what the code was.
The hardest part is undoing the electrical and def fluid connectors before you lower it fully to the ground.
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
That’s a damn good idea. Cause I just a call back from the dealership. They are saying $1003 to replace the pump. I found the pump on line from a ford dealership in I think Oklahoma for $250 and it does look to hard to diy. Seeing how it seems to be on top of the tank. But still a good idea to find out what the code was.
Tuned
Joined: May 2019
Posts: 279
Likes: 14
From: Brookings, SD
If you have access to a lift, or 4 guys to help you pull off the bed, it MIGHT be easier to go that route. But really, dropping the def tank aint that bad. I did it myself and I consider myself intermediate at best when it comes to that type of work.