PACCAR PX-9 CM2350 (2013-17) Fault Code:3376 PID: SPN:5319 FMI:31 Aftertreatment Diesel Particulate Filter Incomplete Regeneration – Condition Exists

Reason:
Aftertreatment Diesel Particulate Filter Incomplete Regeneration – Condition Exists. The system has detected that the aftertreatment diesel particulate filter differential pressure is too high following an active regeneration.

Effect:
Possible frequent need for aftertreatment regeneration.

Circuit Description:
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter. Under normal operating conditions, the aftertreatment diesel particulate filter is self-cleaning, where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment diesel particulate filter. The soot load in the aftertreatment diesel particulate filter is estimated, using the aftertreatment differential pressure sensor and the calculated soot output of the engine.

Component Location:
The aftertreatment diesel particulate filter differential pressure sensor is mounted on the diesel particulate filter. It is a combination sensor that detects both diesel particulate filter differential pressure and outlet pressure. Refer to the original equipment manufacturer (OEM) service manual.

Conditions for Running the Diagnostics:
This diagnostic only runs after successful completion of an active regeneration of the aftertreatment diesel particulate filter.

Conditions for Setting the Fault Codes:
The estimated soot load in the aftertreatment diesel particulate filter was higher than a calibratible value.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL) after the diagnostic fails on two consecutive trips.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and perform the INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
N/A

Possible Causes:
1) A malfunctioning aftertreatment fuel injector
2) Malfunctioning aftertreatment temperature sensors
3) A malfunctioning aftertreatment diesel oxidation catalyst
4) A malfunctioning or stuck in-range aftertreatment diesel particulate filter differential pressure sensor
5) An engine malfunction resulting in high engine out smoke
6) A damaged or malfunctioning OEM wiring harness to the differential pressure sensor