Cummins ISB CM850 (2003-06) Fault Code: 2375 PID: 412 SPN: 412 FMI: 3 EGR Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the EGR temperature sensor circuit.

This fault code is set active if the sensor signal voltage is above the normal operating range for the sensor and the ECM has commanded the EGR valve open. This fault code will not be set active if the ECM has commanded the EGR valve closed. However, once the fault code is set, it will remain active independent of whether the EGR valve is open or closed.

The EGR temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active. Before troubleshooting Fault Code 2375, check for multiple fault codes.

Possible causes:

1)Open return circuit in the harness, connectors, sensor, or ECM
2)Open signal circuit or shorted to a voltage source.

Possible repairs:

1)Replace the EGR temperature sensor.
2)Replace the ECM.
3)Repair or replace the engine harness.