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Discussion Starter #1
At 800 miles the warning came on and was counting down normally.Then it took a sudden drop to 249 miles to empty and now it's back up to around 300.Anyone else have this happen.
 

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I don't really have an answer to your question but about how much does yours use def wise, mine has 5000 miles and took 4 gal. Does that sound right?

An idea though, maybe the def gauge is kinda like the instant mpg where it changes depending on how you drive? :dunno:
 

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Discussion Starter #3
I usually get around 5000 miles before the warning comes on.The last couple of months I have been hauling some heavy loads though and the warning came on sooner this time.
 

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Yeah, our f450 does all the towing too so it prolly uses more than normal. Well free bump for ya!
 

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Inever let mine get low enough to start the 800 mile count. I periodically check it and when it drops below 1/2 full, I add a 2.5 gals jug.
 

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Discussion Starter #6
I put 5 gallon of DEF in this evening and it could have held a little more.Mileage was back down to about 250 miles to empty.
 

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Go thru a few key cycles and drive the truck a few miles. If the message does not reset, get the software checked at your dealer.

Since you added 5 gallons, you were almost empty and should have gotten the message but it was weird how the countdown went?? I hope it resets itself for you.
 
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