DEF warning
More Turbo
Joined: Jan 2010
Posts: 642
Likes: 14
Mine did the same thing recently, and started doing the countdown. It still showed it being 94% full on my edge CtS. I went and added almost 2.5gallons of DEF and it went to 98% full and the count down went away.
I think sometimes these trucks get confused since they are trying to infer the current DEF level based on when it was last filled and how many miles have elapsed. I think the previous time I over filled it, as it was parked in the driveway with the front facing upslope.
Try adding DEF until it is actually full and the message will go away.
I think sometimes these trucks get confused since they are trying to infer the current DEF level based on when it was last filled and how many miles have elapsed. I think the previous time I over filled it, as it was parked in the driveway with the front facing upslope.
Try adding DEF until it is actually full and the message will go away.
Post Fiend
Joined: Nov 2001
Posts: 6,748
Likes: 118
From: Tallassee, ALabama
Mine did the same thing recently, and started doing the countdown. It still showed it being 94% full on my edge CtS. I went and added almost 2.5gallons of DEF and it went to 98% full and the count down went away.
I think sometimes these trucks get confused since they are trying to infer the current DEF level based on when it was last filled and how many miles have elapsed. I think the previous time I over filled it, as it was parked in the driveway with the front facing upslope.
Try adding DEF until it is actually full and the message will go away.
I think sometimes these trucks get confused since they are trying to infer the current DEF level based on when it was last filled and how many miles have elapsed. I think the previous time I over filled it, as it was parked in the driveway with the front facing upslope.
Try adding DEF until it is actually full and the message will go away.
If you look at the DEF sensor, you will see 4 rods/anodes/conductors. One rod is a common conductor for the other 3 rods/anodes/conductors. They measure the DEF level so the PCM can compute the level, full, ok, under half full and when to give the 500 mile count down.
jbsfarms - Many people run the DEF level in the tank down til the count down starts before they add DEF.
Cargo Master
Joined: Feb 2015
Posts: 2,338
Likes: 255
From: Livermore Ca.
I had this happen to my truck and I added DEf and the countdown wouldnt go away. i unhooked the battery and that made no difference. I thought I would have to go to the dealer but it went away with about 100 miles till limp mode. Never had any problem since. ZJust keep driving and it should go away on it's own. If you get below 100 miles than take it in.
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