Message showing low DEF when it's full
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3rd Gear
Joined: May 2018
Posts: 3
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Message showing low DEF when it's full
Hello,
I have a 2014 F250 6.7. I got the standard message that I had 500 miles to fill the DEF tank or I would be limited to 50 MPH. I was on a trip and didn't refill it until I got home. It was showing about 100 miles then. After refilling I drove it around but it didn't reset. It's now showing 10 miles until I will be restricted to 50 mph. Any ideas what might be the problem and how I can fix it. Thanks
I have a 2014 F250 6.7. I got the standard message that I had 500 miles to fill the DEF tank or I would be limited to 50 MPH. I was on a trip and didn't refill it until I got home. It was showing about 100 miles then. After refilling I drove it around but it didn't reset. It's now showing 10 miles until I will be restricted to 50 mph. Any ideas what might be the problem and how I can fix it. Thanks
Mountain Pass
Joined: Dec 2024
Posts: 147
Likes: 86
There was a warranty extension for faulty DEF sending units. But I suspect your truck is too old to qualify at this point. Try a google search just to be sure.
I had that happen to mine once; it gave me the 500 mile warning, but took less than 2 gallons to refill. Luckily mine did reset after a refill and a couple of restarts. I searched online and found some forum threads that suggested this could happen if you top off your def tank when it isn't nearly empty. Apparently it confuses the sending unit. Supposedly you're supposed to wait until you get the warning before you fill it. Not knowing this at the time, I had topped mine off when it was still more than half full. I haven't done that since. So far, so good.
If it hasn't reset after a couple of restarts, you're probably going to have to take it to a dealer or a good independent diesel mechanic. Or maybe try replacing the sending unit yourself.
I had that happen to mine once; it gave me the 500 mile warning, but took less than 2 gallons to refill. Luckily mine did reset after a refill and a couple of restarts. I searched online and found some forum threads that suggested this could happen if you top off your def tank when it isn't nearly empty. Apparently it confuses the sending unit. Supposedly you're supposed to wait until you get the warning before you fill it. Not knowing this at the time, I had topped mine off when it was still more than half full. I haven't done that since. So far, so good.
If it hasn't reset after a couple of restarts, you're probably going to have to take it to a dealer or a good independent diesel mechanic. Or maybe try replacing the sending unit yourself.
Last edited by Wellibe; Feb 26, 2026 at 07:38 PM.
Senior User
Joined: Nov 2014
Posts: 1,776
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From: France
I have a 2015 and I’ve had that as well once, other times it was ok. I filled up when the warning showed up and it didn’t reset. In the end I disconnected the batteries and waited for a while and IIRC it reset itself shortly afterwards. I then dumped a bottle of DEF cleaner into the tank and I’m waiting for the next warning.
5th Wheeling
Joined: Dec 2018
Posts: 42
Likes: 8
Originally Posted by Euroman;[url=tel:21776544
21776544[/url]]I have a 2015 and I’ve had that as well once, other times it was ok. I filled up when the warning showed up and it didn’t reset. In the end I disconnected the batteries and waited for a while and IIRC it reset itself shortly afterwards. I then dumped a bottle of DEF cleaner into the tank and I’m waiting for the next warning.
FTE Legend
Joined: Mar 2017
Posts: 31,859
Likes: 9,166
From: Western NY
Hello,
I have a 2014 F250 6.7. I got the standard message that I had 500 miles to fill the DEF tank or I would be limited to 50 MPH. I was on a trip and didn't refill it until I got home. It was showing about 100 miles then. After refilling I drove it around but it didn't reset. It's now showing 10 miles until I will be restricted to 50 mph. Any ideas what might be the problem and how I can fix it. Thanks
I have a 2014 F250 6.7. I got the standard message that I had 500 miles to fill the DEF tank or I would be limited to 50 MPH. I was on a trip and didn't refill it until I got home. It was showing about 100 miles then. After refilling I drove it around but it didn't reset. It's now showing 10 miles until I will be restricted to 50 mph. Any ideas what might be the problem and how I can fix it. Thanks
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