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.