DEF stuck at 25%
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Thread: DEF stuck at 25%

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    MP81 is offline [OP]
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    DEF stuck at 25%

    Anyone ever had this happen?

    DEF reading was somewhere below the "OK" amount, can't remember exactly, but it was enough for me to put another 2.5 gal jug in, back on April 1st.

    It never went back up to "OK" (usually takes a bit, but eventually will) - has stuck at reading "25%"...and still is stuck at 25%.

    I usually toss in a full 2.5 gallon jug roughly every three or four months, looking back at my log, so it's likely still above 25%, it's just odd it hasn't changed from 25% even when it should have changed to "OK".
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    Last edited by Blasirl; 06-11-2019 at 11:48 AM.
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    Yes I have had a similar issue on my Gen 1. It would not go up after I added DEF, just as you described. Then I did the DEF reset using the Bi-scan for GM Torque plug in app developed my Snipesy... Now it's perpetually 100%. I have to check level with a stick and add periodically.. otherwise no problems. It's odd.

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    No answer to your specific question, but I did just finally run mine until the system said I was empty out of curiosity. I was rather surprised when it said I was empty but had another 350 miles before it went to Max 65MPH limp mode. Hit the truck stop with 150 miles left and put in exactly 5 Gallons without overflowing. $15 at $3 a gallon and done in under 5 minutes. Never go back to those messy blue jugs mucking up my trunk
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    Quote Originally Posted by MRO1791 View Post
    Yes I have had a similar issue on my Gen 1. It would not go up after I added DEF, just as you described. Then I did the DEF reset using the Bi-scan for GM Torque plug in app developed my Snipesy... Now it's perpetually 100%. I have to check level with a stick and add periodically.. otherwise no problems.
    Wonderful. I just bought an obd Bluetooth scanner, Torque Pro and Bi-Scan after following recommendations in an earlier thread. Also, the local GM dealer wants $89 just to do an obd read. So I guess it is a break even situation. It irritates me to no end when software is buggy, especially from the likes of GM.

    I think perhaps that GM changed the software when they did the def heater recall. Maybe it took us all this long to use the tank and see the problem.

    Are you sure it is stuck at 100%? Checking the level with a stick isn’t the end of the world. Like dipping the tanks on a Cessna! The stick don’t lie!
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    Quote Originally Posted by dougc905 View Post
    Wonderful. I just bought an obd Bluetooth scanner, Torque Pro and Bi-Scan after following recommendations in an earlier thread. Also, the local GM dealer wants $89 just to do an obd read. So I guess it is a break even situation. It irritates me to no end when software is buggy, especially from the likes of GM.

    I think perhaps that GM changed the software when they did the def heater recall. Maybe it took us all this long to use the tank and see the problem.

    Are you sure it is stuck at 100%? Checking the level with a stick isn’t the end of the world. Like dipping the tanks on a Cessna! The stick don’t lie!
    Yes, pretty sure it's stuck at 100%. Hasn't changed in many, many miles and with stick level was probably less than 25% last fill. Took a full 2.5gal jug and still was not full. But no issue with driving or limp mode, and it's easy to check and add at each oil change.

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    MP81 is offline [OP]
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    Quote Originally Posted by dougc905 View Post
    I think perhaps that GM changed the software when they did the def heater recall. Maybe it took us all this long to use the tank and see the problem.
    I don't think that's the case - we had ours replaced at around 40k miles, and it's been fine up until this last fill.

    I'll just wait until it gives us a speed limitation and I'll put more in. I usually keep a couple jugs on hand.
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    I prefer a couple of jugs in hand
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    There was no DEF Heater recall. There is a special service bulletin that extends the warranty period for the DEF Heater when a specific CEL pops. Firmware was changed to adjust sensor upper/lower control limits (twice) and that was a Emissions recall (with a recall of the recall and then a reissue of the recall). That sucked! But my car hasn't popped a sensor CEL since.
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    Quote Originally Posted by MP81 View Post
    I don't think that's the case - we had ours replaced at around 40k miles, and it's been fine up until this last fill.
    I wonder if they are doing over-the-air updates as I haven’t had my car back to a GM dealer since the def tank was replaced about two years ago.
    Last edited by dougc905; 06-14-2019 at 06:13 AM.
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