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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 04-04-2019, 07:56 PM   #1 (permalink)
2500HDKartRacer
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DEF Level Stuck at 24%

My DEF level was at 17% so I added a 2.5gal jug of DEF. The level went to 24% and has not changed. I drove 750 miles and it is still at 24%. I added another 2.5gal jug of DEF and the level is still at 24%. I searched this forum and didn't find anything related to this. Has anybody experienced this? What is the fix?

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Old 04-04-2019, 07:58 PM   #2 (permalink)
wild1
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Ive had it happen in the winter. After a couple weeks it started to work normally. Id either give it a couple weeks or head into the dealer. Your choice.

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Old 04-05-2019, 01:37 AM   #3 (permalink)
Ron Nielson
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I think this may be of interest to you:


https://www.dieselplace.com/forum/63...fluid-low.html
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Old 04-06-2019, 01:25 PM   #4 (permalink)
dmax3500
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do you have a tech2 scanner ,or know somebody that has one?


fill the DEF tank to full [in the filler neck],the ''reset'' the DEF level to full,using the tech 2 scanner
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Old 04-10-2019, 04:16 PM   #5 (permalink)
goobs
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my truck has been to 3 different dealers for a total of 6x in 4yrs for this issue.
each time its "fixed" they guarantee it wont do it again. i know once or twice the def heater has been replaced, not sure what that has to do with it. and the rest they reset it manually with a tech 2. its very frustrating!
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