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    GTT's Pilot in Command (PIC) farmgirl19's Avatar
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    Def

    So as to not hijack another thread, I started this one, because the other one got me wondering.......(Not a good thing!)

    Since my diesel truck and tractor are old, can someone tell me...

    What happens if you run out of DEF and decide to go without it? Would it be sort of like removing a catalytic converter, and only show up at inspection time? Or will some silly little ole computer shut the machine down?

    Might need some computer geek work arounds, if the latter is the case.
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    Hmmm... I found this in a FAQ elsewhere:

    What will happen if my truck runs out of Diesel Exhaust Fluid (DEF)?

    The U.S. Environmental Protection Agency requires vehicle manufacturers to put measures in place to ensure that vehicles cannot run without Diesel Exhaust Fluid (DEF). Before a truck's DEF tank runs empty the driver is given a series of alerts on their dashboard displays (much the same way as if they were running low on diesel). Generally speaking, when the DEF tank level drops below 10% an amber warning lamp will come on, at 5% this lamp starts flashing and below 2.5% a solid amber warning light is displayed.

    If the truck is allowed to run out of DEF the engine's power is reduced, a solid red warning will be displayed and the vehicle speed will be limited to 5 mph until the DEF tank is refilled.
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    Captain Hook Kennyd's Avatar
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    On my new (unmodified) truck, if you ignore the low DEF warnings the truck will go into limp mode and only go 5mph till the tank is refilled.
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    Quote Originally Posted by Kennyd View Post
    On my new (unmodified) truck, if you ignore the low DEF warnings the truck will go into limp mode and only go 5mph till the tank is refilled.
    Meh, fill it with water and see what happens
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    GTT's Pilot in Command (PIC) farmgirl19's Avatar
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    I'm going to kiss both my F-250 and my 1050 today, and hope they run forever!!

    However, just as "smart phones" can be unlocked, there has got to be a "bypass the system" in the works for the DEF stuff.

    Thanks for the info!
    grnspot110 and Levi like this.
    If man had enough horse sense to treat his wife like a Thoroughbred, she'd never grow into an old nag.

    If you climb in the saddle, be ready for the ride!

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    GTT's Pilot in Command (PIC) farmgirl19's Avatar
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    Quote Originally Posted by johnH123 View Post
    Meh, fill it with water and see what happens
    You first!
    If man had enough horse sense to treat his wife like a Thoroughbred, she'd never grow into an old nag.

    If you climb in the saddle, be ready for the ride!

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    johnH123's Avatar
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    Quote Originally Posted by farmgirl19 View Post
    I'm going to kiss both my F-250 and my 1050 today, and hope they run forever!!

    However, just as "smart phones" can be unlocked, there has got to be a "bypass the system" in the works for the DEF stuff.

    Thanks for the info!
    Read post no. 4, follow the instructions, and see what happens!!!

    This does raise a question, though. What happens when you deere runs out of this stuff? What is it and what does it do, anyway?
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    johnH123's Avatar
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    Quote Originally Posted by farmgirl19 View Post
    You first!
    Beat me to it!
    farmgirl19 likes this.
    - 2002 John Deere 4510 TLB PR,
    -Woods BB60X 60" rotary cutter
    -Countyline box blade,
    -Allis Chalmers sickle mower,
    -RED windrow rake,
    -titan 48" 3000 pound forks/bale spear
    - Farm Star rear bale spear

    Yamaha Rhino 700, Yamaha Rhino 660,
    Murray 624 mower/38" deck

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    Def

    Quote Originally Posted by johnH123 View Post
    Read post no. 4, follow the instructions, and see what happens!!!

    This does raise a question, though. What happens when you deere runs out of this stuff? What is it and what does it do, anyway?
    DEF is usually an urea compound designed to reduce emissions. The longer answer is that it's about $15.00 for 2.5 gallons and causes thousands of dollars in additional engine design cost but makes the EPA happy.

    A happy EPA isn't high on my list of priorities but that's what we all live with right now.

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    Quote Originally Posted by johnH123 View Post
    Meh, fill it with water and see what happens

    They actually have sensors that test what is in the tank. By looking for a specific chemical composition, the senors can tell if you try to substitute with water (or anything else) and will leave you in limp mode.
    D160 Mower/Bagger.
    2014 2032R tractor/H130 FEL w/Bolt-On Hooks/54" Snow Plow/iMatch Quick-Hitch/County Line 5' Scraper blade/County Line Carry-All/Artillian 42" Forks & QH Adapter/JD Ballast Box/Frontier SB1164 3PH Blower/Leinbach PHD/Wallenstien BX42 Chipper

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