Cummins ISB CM850 (2003-06) Fault Code: 957 PID: 27 SPN: 27 FMI: 2 EGR Valve Position - Data erratic, intermittent, or incorrect. Intermittent EGR position information is being received by the electronic control module (ECM).

This fault code is caused by an internal failure of the EGR valve position sensor. This failure causes erratic readings of EGR valve position. The troubleshooting information for fault code 957 is the same as fault code 1228. Refer to fault code 1228 for the fault code troubleshooting information.

Possible repairs:

1)Replace the EGR position sensor.

Cummins ISB CM850 (2003-06) Fault Code: 951 PID: 166 SPN: 166 FMI: 2 Cylinder power imbalance between cylinders. A power imbalance between cylinders was detected by the ECM.

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Cummins ISB CM850 (2003-06) Fault Code: 779 PID: SID 51 SPN: 703 FMI: 11 Auxiliary Equipment Sensor Input #3 (OEM Switch) - Root Cause Not Known.

Cummins ISB CM850 (2003-06) Fault Code: 778 PID: SID 64 SPN: 723 FMI: 2 Engine Speed Sensor (Camshaft) Error - Data Erratic, Intermittent, or Incorrect. The ECM has detected an error in the camshaft position sensor signal.

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