Cummins ISB CM850 (2003-06) Fault Code: 2352 PID: SID 146 SPN: 2791 FMI: 3 EGR Valve Control Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the EGR valve motor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2352 PID: SID 146 SPN: 2791 FMI: 3 EGR Valve Control Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the EGR valve motor circuit.

The ECM monitors the voltage level of the circuit and logs a fault code if the voltage level indicates a short to ground. This fault is always set inactive when the keyswitch is turned ON. If there is a failure of this circuit, the fault code will not be set active until the valve has been actuated. For these reasons this troubleshooting tree must be used for both active and inactive fault codes. This also means that the only sufficient way for making sure that the repair is effective is to run the INSITE? electronic service tool EGR Valve Test. Running the engine may not be enough to verify that the fix was effective.

Possible causes:

1)The EGR motor (+ or – ) leads could be shorted to a voltage source in the harness or ECM.

Possible repairs:

1)Repair or replace the engine harness.
2)Replace the ECM.
3)The removal and installation of the connector may correct the problem.