CM2150 Electronic Control System – FAULT CODE 2375

Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source


Fault Code: 2375
PID: P412
SPN: 412
FMI: 3/3
LAMP: Amber

Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at EGR temperature circuit.

EGR valve actuation will be disabled.

ISB, ISC, and ISL – Exhaust Gas Recirculation Temperature Sensor Circuit

Circuit Description

The exhaust gas recirculation (EGR) temperature sensor is a variable resistor sensor and is used to measure the temperature of the EGR gas flow after it exits the EGR cooler. The ECM supplies 5 volts to the EGR temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the EGR flow temperature.

The EGR temperature value is used by the ECM for the engine protection system and engine emissions control.

Component Location

The EGR temperature sensor is located on the EGR connection tube between the EGR cooler and the air intake connection.Refer to Procedure 100-002 (Engine Diagrams) in Section E for a detailed component location view.

Conditions for Running the Diagnostics

This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes

The ECM detects that the EGR temperature signal voltage is greater than 5.1-VDC for more than 1 second.

Action Taken When the Fault Code is Active

  • The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs and fails.
  • A default value for the exhaust gas recirculation temperature reading is used.

Conditions for Clearing the Fault Code

The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

Shop Talk

Verify the 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. Refer to Procedure 019-032 (ECM Calibration Code) in Section 19 in the corresponding Troubleshooting and Repair Manual for the engine being serviced.

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.

Possible causes of this fault code include:

  • An open return circuit in the harness, connectors or sensor
  • An open signal circuit or shorted to a voltage source.

Temperature °C
Temperature [°F]
Resistance (ohms)
256k to 423k
99k to 154k
42k to 63k
5.5k to 7.1k
1.9k to 2.3k
520 to 580

Refer to Troubleshooting Fault Code t05-2375

Last Modified:  20-Jul-2010