Isx 3567 code and derate

[JM84]

Hello,

Got a truck with scr fault which is derating engine.

Code is 3567. Had the code pop up a few months ago but went inactive. Now it’s back. Most likely cause the doser valve? Metering unit?

I’m not going through any def fluid. Level is staying the same. I did a def fluid leak test and it pressures up fine.

[tree98]

It's saying the def doser isn't getting power. Look for a wiring problem or bad doser.