CM2150 Electronic Control System – FAULT CODE 2961

Exhaust Gas Recirculation Temperature – Data Valid But Above Normal Operational Range – Least Severe Level


Fault Code: 2961
PID: P412
SPN: 412
FMI: 0/15
LAMP: None

Exhaust Gas Recirculation Temperature – Data Valid But Above Normal Operational Range – Least Severe Level. EGR temperature has exceeded the engine protection limit.

Slight fueling derate to bring EGR temperature under the maximum limit.

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 electronic control module (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 coolant 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 valve and the air intake connection. Refer to Procedure 100-002 in Section E.

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 is greater than 210°C [410°F] (for ISB) or 237°C [460°F] (for ISC & ISL) for more than 5 seconds.

Action Taken When the Fault Code is Active

  • The engine torque will be derated up to 40 percent to limit the EGR temperature.

Conditions for Clearing the Fault Code

The fault will go inactive immediately after the EGR temperature drops below 210°C [410°F] or 237°C [460°F] (for ISC & ISL).

Shop Talk

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, calibrate the ECM. Refer to Procedure 019-032 in Section 19.

Possible causes of this fault code include:

  • Plugged or leaking EGR differential flow ports
  • A malfunctioning EGR valve
  • A stuck open turbocharger control valve
  • A low reading from the EGR differential pressure sensor
  • A low reading for the EGR valve position sensor
  • High exhaust temperatures
  • Low coolant level
  • High coolant temperature
  • An incorrect coolant/water mixture
  • A stuck closed variable geometry turbocharger
  • A fouled EGR cooler.

Note: This fault code will most likely not be active with no load in the shop. The engine must be loaded to trigger this fault code.

Refer to Troubleshooting Fault Code t05-2961

Last Modified:  14-Sep-2010