CM850 Electronic Control System – FAULT CODE 2346 (ISB/QSB Automotive or Industrial Application)

Exhaust Gas Temperature – Data Above Normal


Fault Code: 2346
SPN: 2789
FMI: 1/15
LAMP: Amber

Exhaust gas temperature – data above normal. High exhaust temperature has been calculated by the electronic control system.

Derate in power output of the engine in attempt to decrease the calculated exhaust gas temperature value.


Circuit Description

Exhaust temperature is a calculated value that the electronic control module (ECM) derives based on engine operating conditions, such as intake manifold temperature and pressure, engine speed, fuel flow, and exhaust gas recirculation (EGR) valve pressure.

Component Location

There is not a physical exhaust gas temperature sensor on the engine. The exhaust gas temperature is a calculation of the exhaust gas temperature before entering the turbocharger and is also known as the turbine inlet temperature.

Shop Talk

The most common cause of this fault code is low boost. Low boost can be caused by several factors:

  • Leaking charge air cooler
  • Damaged charge air piping or hose
  • Loose charge air cooler clamps
  • Failed intake manifold pressure sensor
  • Failed variable geometry turbocharger.

NOTE: This fault code will most likely not become active under conditions of the engine being unloaded and in the shop. The engine must be loaded to trip this fault code and to verify if the failure has been fixed.

Refer to Troubleshooting Fault Code t05-2346

Last Modified:  08-Jul-2010