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Cummins ISX CM870 (2003-06) Fault Code: 1228 PID: P27 SPN: P27 FMI: 2/2 EGR valve position sensor circuit – data erratic, intermittent, or incorrect.

This fault code is caused by an internal failure of the EGR valve position sensor. This failure causes erratic readings of EGR valve position.

NOTE: Prior to running the INSITE? electronic service tool EGR Valve and EGR Valve/Turbocharger Operational Test, the ECM Calibration Software Phase could possibly need to be updated to the latest Software Phase. The ECM Calibration Phase Software can be checked in INSITE? electronic service tool, under ‘Features and Parameters’. Expand the selection for ‘System ID and Dataplate’ and go to ‘Calibration Information’. If the Software Phase is earlier than shown below, recalibrate the ECM using the January 2006 INCAL? CD-ROM, or later. Engines with the Software Phase listed below or later do not require a recalibration.

ISX engines with CM870 (engines built after January 2004) require Software Phase 06050302.

ISX engines with CM870 (engines built before January 2004) require no changes at this time.

This is a warrantable calibration change.

Possible repair:

1)Replace the EGR position sensor.

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