Weird DEF Issue
Senior User
Joined: May 2012
Posts: 391
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From: Frisco, TX
how do you get it to show mileage? Mine only has OK and the inevitable 500 miles to empty, granted only twice. Oh and the pump failed so they had to replace it.
Lead Driver
Joined: Jan 2005
Posts: 7,782
Likes: 221
From: Huntington Indiana
It showed miles on startup.
Freshman User
Joined: Mar 2019
Posts: 37
Likes: 0
I own a 2019 F350 that suddenly showed the DEF was full when I knew it had only a half tank the day before. Took her in under warranty and she spent a week at the dealership trying to diagnose the problem. They tried multiple things like changing the level sensor, etc. When that did not work, Ford was contacted and the dealer did several checks on the system, including wiring. They ended up changing out the entire tank and the system supposedly worked, but here I am three weeks after this fix, about 1200 miles, and the DEF level still shows full. Coincidentally, or not, the real reason I brought the truck in was that my EGT temp sens No. 1 had a fault. They found that a rat had chewed through the wire, but emphatically said there was no wire damage to the DEF tank level wiring. Wondering if anyone else has experienced this reading of full when not, or have any ideas?
Hotshot
Joined: Oct 2015
Posts: 19,711
Likes: 12,852
From: Wyoming
The DEF level has a tendency to be a bit slow to report changes. Then again, A full tank of DEF should last an average of 5,000 miles on a 2017-2019 truck. I would give it more miles before raising a red flag.
Freshman User
Joined: Mar 2019
Posts: 37
Likes: 0
Thanks for the insight!
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