Detroit DD15 EPA07 (2007-09) Fault Code: SPN 3609 FMI 20 (MCM) Diesel Particulate Filter (DPF) Inlet Pressure Sensor Connector Fault

PROBABLE CAUSES:
1. Check all connections upstream to the MCM (ATD 10-pin connector, vehicle interface module 31-pin connector, MCM 120-pin connector).
2. Defeat device installed on vehicle.
3. DPF inlet pressure hose assy.
4. Forced regen.