Cummins ISB CM850 (2003-06) Fault Code: 2556 PID: SID 70 SPN: 729 FMI: 4 Intake Air Heater #1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the intake air heater signal circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2556 PID: SID 70 SPN: 729 FMI: 4 Intake Air Heater #1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the intake air heater signal circuit.

Possible causes:

1)A shorted intake air heater relay
2)Intake air heater relay supply wire shorted to ground.

Possible repairs:

1)Replace the damaged intake air heater relay.
2)Repair or replace the OEM harness.
3)The removal and installation of the connector may correct the fault.
4)Replace the ECM.

Categories Cumminz, ISB CM850 (2003-06) Tags 06, 1, 2003, 2556, 4, 70, 729, Air, at, Below, Circuit, Circuit., CM850, Code, Cummins, Detected, Fault, FMI, Heater, Intake, ISB, Low, Normal, or, PID, Shorted, SID, signal, Source, SPN, the, to, Voltage

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