How to Troubleshoot DD15 DTC 4374 FMI 0 Under Pressurized Def System

Troubleshooting 2015 Detroit DD15
SPN 4374 FMI 0

This repair is for the electric DEF PUMP on a Freightliner Cascadia.
If you have the this code and you can see the pump is leaking then this repair can be made at home. There are no special tools required to replace the pump. The scan tool is not required to reset or test anything for the code to become inactive and the derate is removed. Start the truck and let it run for a minute or so . The ACM will see that it is now working and proper pressure and rpm is now correct and codes will become inactive. Following the troubleshooting steps may help with some creativity to make this fix.

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