Code 3364 and 3521 came on my truck out the blue

Discussion in 'Trucks [ Eighteen Wheelers ]' started by DAX_, Sep 26, 2021.

  1. gentleroger

    gentleroger Road Train Member

    Jun 1, 2010
    No, freightliner won't be able to do anything.

    My guess is the def was sloshing in the tank and got bubbly, which freaked the sensor out. A few years ago a mechanic advised that I top off the Def every time I fill up to help avoid these kind of issues.
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