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Old 05-10-2016, 05:18 PM
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DEF gauge calibration?

Hi folks,

So I just recently filled the DEF tank for the second time ever, first time on my own. The first time the dealer filled it, the gauge showed that it was short of full (maybe ~90%?). I figured the dealer just shorted me some fluid.
But now that I've filled it on my own, the gauge again did not go to 100%, see attached photo. I've watched it for a few days now and it never lit up to 100%.

Is there some kind of calibration or other adjustment that can be done to make sure that my DEF gauge is accurate? Anybody else run into this issue?

-Chris
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File Type: jpg IMG_2773.jpg (517.3 KB, 12 views)

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Old 05-10-2016, 07:22 PM
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Quote:
Originally Posted by chris. View Post
Is there some kind of calibration or other adjustment that can be done to make sure that my DEF gauge is accurate?
Unlike the fuel gauge, the DEF gauge is based on a crappy ultrasonic sensor that cannot be precise. This is the reason one must add at *least* one gallon of DEF each time DEF is added; if not, the data averaging algorithms presume the DEF sensor is hitting the crack pipe again and ignore the change.

While I definitely understand how having the gauge not read "full" is annoying, I'm sure you're aware that a full tank of DEF will last you close to 10k miles. If it really bothers you I'm sure you can take it to the dealer.

Personally, I've switched to keeping only between 0.5 and 3.0 gallons of DEF in the tank. As the number of refills trends to infinity, the average age of DEF in the tank approaches the DEF refill interval as a limit. I simply pretend my tank has a 3 gallon capacity and thus my DEF never sits in the tank more than 6 months. Freshly squeezed DEF is happy DEF.
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Old 05-10-2016, 09:38 PM
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Re: DEF gauge calibration?

Quote:
Originally Posted by Roadkill View Post
Freshly squeezed DEF is happy DEF.
I like the saying!

Initially I was concerned about making sure the DEF tank was always full. But have read too much about bad/expired DEF causing issues. So now run my DEF in the "bottom half" of the tank. At least in my mind I keep fresher DEF in my tank by only filling it up 1/2 way and then letting the DEF get towards empty before adding more.
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Old 05-10-2016, 11:49 PM
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Re: DEF gauge calibration?

You can also buy DEF tester, to make sure you are putting in 32.5% urea from the start.
When my DEF gets into bottom range, I add 2.5 gallon box. Since I drive mostly freeway, I get over 4000 miles per box.
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Old 05-10-2016, 11:49 PM
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Re: DEF gauge calibration?

I had the dealer refill my DEF about 3 months ago.

The gauge read about 2/3rds full and I thought they had shorted me, but I wasn't going to complain because they also gave it to me free "this time" from their bulk tote in the service department (normally $2.99/gal).

After a few hours of driving, it was reading full.

Moral of the story: sometimes the averaging system they use for this gauge takes way longer to do its job than you think it should. Don't sweat it. Measure on the input, pay only for what you put in, and you'll be fine.
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Old 05-11-2016, 12:53 PM
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Re: DEF gauge calibration?

I also keep the DEF tank less than half full most of the time. Less fluid to heat in the cold North Dakota winters.
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Old 05-12-2016, 01:44 PM
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Re: DEF gauge calibration?

When the light comes on I put 2.5 gal in... I never fill it! Walmart or SAMs has always worked! This is on a 2014 August order... delivered November! One of the early builds with 33,000 miles and no issues. Not a daily driver...70 miles is a short run on this one.



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Old 05-15-2016, 11:15 PM
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Re: DEF gauge calibration?

In my 2014, I also keep my DEF level low as well, putting only 2 "boxes" in at a time, filling to perhaps 60% max. I have always bought BlueDEF from AutoZone and have never had an issue in 49,500 miles. I do take a picture of the lot numbers just in case. The empty DEF container makes a PERFECT catch basin for oil changes. With the fill intervals, I always have one available. It makes for an easy no-mess drain and quick drop at the recycling center.
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Old 05-17-2016, 08:43 PM
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Re: DEF gauge calibration?

It has a mind of its own. My Jeep came with 32% DEF and when it got 27%, I bought 5 gallons of Blue DEF from Mega Lo Mart. After putting all 5 gallons, the DEF gauge showed me 96%, then got 100% after couple of days. From there on, it was pretty consistent and went down to 88% in about three weeks of driving. Then, last week it came back up to 98%, and in a week has gone down to 91%.
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