Cummins ISX12 CM2250 (2010-12) Fault Code: 3138 PID: SPN: 5019 FMI: 2 Engine Exhaust Gas Recirculation Outlet Pressure- Data Erratic, Intermittent, or Incorrect

Circuit Description
The engine control module (ECM) provides a 5 volt supply to the EGR orifice pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The EGR orifice pressure sensor provides a signal to the ECM on the EGR orifice pressure sensor signal circuit. This sensor signal voltage changes based on the pressure at the EGR orifice pressure sensor.

Component Location
The EGR orifice pressure sensor is mounted on the EGR mass measurement assembly near the EGR differential pressure sensor.

Conditions for Running the Diagnostics
This is a two part diagnostic.

The first part of the diagnostic runs continuously while the keyswitch is in the ON position or the engine is operating.
The second part of the diagnostic runs at key OFF.
Conditions for Setting the Fault Codes
The ECM detects that the EGR orifice pressure sensor is not changing with engine conditions or is incorrect at key OFF.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
The EGR valve will be closed.
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
To validate the repair, start the engine and let it idle for 5 minutes. After 5 minutes, shut OFF the engine, perform a key cycle, and leave the key in the ON position for 1 minute.
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop-and-go city driving and steady state highway driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates acceleration and motoring events, steady state highway operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
For On-Board Diagnostics (OBD) engines, the ECM will turn off the MIL after three consecutive trips where the diagnostic runs and passes.
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
Possible causes of this fault code include:

A damaged EGR orifice pressure sensor
High resistance in the wiring harness on the SIGNAL or RETURN wire
Plugged or restricted EGR differential pressure sensor flow ports.

Possible Cause:
1) ECM calibration