Cummins ISM CM870 (2003-06) Fault Code: 2551 PID: P129 SPN: 1349 FMI: 0/16 Rear Fueling Actuator Pressure High - Warning. Unexpected high fueling detected on the rear bank.

The ECM estimates the amount of fuel injected into the front and rear banks of the engine by analyzing the acceleration of the crankshaft. This fault is set active when the estimate of fueling on the rear bank is higher than expected.

Possible repairs:

1)Replace the rear fueling actuator.
2)Return the front and rear fueling actuators to their original positions.
3)Replace the rear timing actuator.

Cummins ISM CM870 (2003-06) Fault Code: 2385 PID: S027 SPN: 641 FMI: 3 Variable geometry turbocharger actuator driver circuit - voltage above normal or shorted to high source. Open circuit or high voltage detected at turbocharger control valve circuit.

Cummins ISM CM870 (2003-06) Fault Code: 2384 PID: S027 SPN: 641 FMI: 4 Variable geometry turbocharger actuator driver circuit - voltage below normal or shorted to low source. Low voltage detected at turbocharger control valve circuit.

Cummins ISM CM870 (2003-06) Fault Code: 2377 PID: S33 SPN: 647 FMI: 3/3 Fan Control Circuit - Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at the fan control circuit.

Cummins ISM CM870 (2003-06) Fault Code: 2376 PID: P412 SPN: 412 FMI: 4/4 Recirculated Exhaust Gas Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at EGR temperature circuit.

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