Tcall Posted April 3 Share Posted April 3 I have a 2024 6.7HO pulling a large trailer, DEF warning comes on show 498 you need to fill, but the %gauge is at 71% so I add DEF and it won't even take 2.5gals ! They is an on going issue. I'm unhooked and driving without trailer and DEF is say 423 fill and my % is at 68 left in tank. Anyone have an idea? PS. My 2021 6.7 was spot on DEF gauge also show correctly when towing. Quote Link to comment Share on other sites More sharing options...
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