Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 3168 PID: SPN: 3936 FMI: 16 Aftertreatment Diesel Particulate Filter System- Data Valid But Above Normal Operating Range- Moderately Severe Level

Circuit Description
The ECM calculates an aftertreatment diesel particulate filter flow resistance, using the aftertreatment diesel particulate filter differential pressure and calculated exhaust flow rate.

Component Location
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM). Refer to the 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 Engine Control Module (ECM) calculated the aftertreatment diesel particulate filter flow resistance was too low after successful regeneration of the aftertreatment diesel particulate filter.

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.

Exhaust Gas Recirculation (EGR) valve operation will be disabled.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
It is necessary to use the “Reset All Faults” command in INSITE™ electronic service tool to clear this fault and extinguish the amber CHECK ENGINE lamp and/or Malfunction Indicator Lamp (MIL).

Shop Talk
Possible causes of this fault code include:

A damaged aftertreatment diesel particulate filter differential pressure sensor
Missing or malfunctioning aftertreatment diesel particulate filter differential pressure sensor tubes
Malfunction aftertreatment diesel particulate filter.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

Possible Cause:
1) Aftertreatment DPF differential pressure sensor failure
2) Aftertreatment DPF differential pressure sensor tubes failure
3) ECM calibration