SPN 5394 FMI 5 - ISX15 CM2250 Volvo

[Timur4593]

Hello everyone
I have a dpf issue which keeps throwing a code SPN 5394 FMI 5. That code states that the power going to the Doser has an open circuit or low voltage.

Now the things ive tried was to replace the Doser with a new one and replaced the DEF fluid filter, the little one thats behind the def tank. I had a computer guy check all connections all things checked out fine.

I am able to clear the code and it wont come on if drive the truck lightly, once ill start pushing it on hills or give high rpms it will throw out the same code and derate. thank you all in advance