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Old 04-04-2019, 07:56 PM   #1 (permalink)
2500HDKartRacer
Diesel Fanatic
 
Join Date: Aug 2006
Posts: 119

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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2016 GMC Sierra 2500HD SLT CC/SB LML
  • Drop Shackle @ 1" drop
  • B&W Gooseneck Hitch
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