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Cummins ISC CM2150 (2007-09) Fault Code: 2646 PID: 110 SPN: 110 FMI: 31 Engine Coolant Temperature – Condition Exists. The EGR valve was closed to reduce engine coolant temperature.

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.

When the engine coolant temperature nears the engine protection limits, the EGR valve will be closed to reduce the coolant temperature. This fault code is used as an information fault code, only indicating that the EGR valve has closed. No failure has occurred to cause this fault code. Other engine protection fault codes will be active if the engine coolant temperature has exceeded the engine protection limits.

No repair is necessary.

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