Cummins ISX12 CM2250 (2010-12) Fault Code: 1228 PID: 27 SPN: 27 FMI: 2 EGR Valve Position- Data Erratic, Intermittent, or Incorrect

Circuit Description
The EGR valve is controlled by a brushless motor located on top of the EGR valve. The EGR valve motor uses three different motor legs to move the valve through its range of motion. The engine control module (ECM) uses the EGR motor A, B, and C wires to command the EGR valve to the appropriate position in order to meet EGR flow targets.

The EGR valve motor contains three position sensors that detect the location of the EGR valve. These sensors report the position of the valve back to the ECM over the EGR valve position A, B, and C wires.

Component Location
The EGR valve position sensor is internal to the EGR valve assembly and can not be serviced separately.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is operating.

Conditions for Setting the Fault Codes
The EGR valve has been unable to reach its commanded position for more than 30 seconds.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
The EGR valve operation will be disabled, and the EGR valve will try to close.
Conditions for Clearing the Fault Code
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 Diagnostic (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:

Intermittent open or short in the wiring harness
Malfunctioning EGR valve position sensor
Malfunctioning ECM
Sticky or broken EGR valve.

Possible Cause:
1) ECM calibration