For the past year, I’ve been having this strange check engine light: two amber check engines and one constant flashing DEF light right above the DEF level gauge. Interestingly, a regen clears this problem every single time. This happens once every 1 or 2 months, and it’s usually associated with SPN 3364 FMI 2 or FMI 1, although I think I’ve had this happen with a different SPN. The regen takes 41-44 minutes to complete.
This is on a 2014 Freightliner Cascadia DD15.
DD15 Check Engine/DEF light that Clears with a Regen?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by PE_T, Aug 19, 2019.
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Their is also a DEF filter by the DEF tank that is supposed to be change. Like every 2 year or something,
PE_T Thanks this.
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