What does SPN 3226 FMI 0 mean on a Freightliner Cascadia?

DPF differential pressure is higher than expected. The filter may be loaded, the pressure tubes may be restricted, or the sensor may be misreporting the pressure difference.

Can I keep driving with SPN 3226 FMI 0?

Treat this as a service-soon condition. Schedule a proper inspection and do not ignore a warning that returns, worsens, or adds a derate.

What should I have ready before checking SPN 3226 FMI 0?

Park outdoors or in an approved ventilated area away from people and combustible material. Do not start a regeneration or dosing test unless the OEM safe conditions are met. Allow the exhaust and aftertreatment to cool before inspecting sensors or lines.

SPN 3226 FMI 0: DPF differential pressure is higher than expected