Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
Possible causes:
1)An open return circuit in the engine harness, connectors, or sensor
2)A signal wire shorted to sensor supply or battery voltage
3)A damaged EGR differential pressure sensor.
Possible repairs:
1)Replace the EGR valve delta pressure sensor.
2)Repair or replace the engine harness.
3)Replace the ECM.
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