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Cummins ISX 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.
The ECM monitors the voltage level on this circuit. When the ECM commands the fan signal low, it expects the voltage level to be approximately 0 volts. If it detects a higher voltage, this fault is recorded. This usually indicates an open circuit or short circuit to a voltage source in the harness.
Once the fault code becomes active, the fan must be cycled to clear the code. This can be done by cycling the manual fan switch, if equipped, or by operating the engine and satisfying the fan engagement requirements.
If Fault Code 2377 is still active after completing the following troubleshooting steps, consult the OEM service literature for procedures to check the fan clutch device for an open circuit or short circuit to ground.
Possible repairs:
1)Replace the fan control solenoid.2)Repair or replace the OEM harness.3)Replace the ECM.
Cummins ISX 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.
Cummins ISX CM870 (2003-06) Fault Code: 2375 PID: P412 SPN: 412 FMI: 3/3 Exhaust Gas Recirculation Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at EGR temperature circuit.
Cummins ISX CM870 (2003-06) Fault Code: 2374 PID: P95 SPN: 1029 FMI: 4/4 Exhaust Gas Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the exhaust gas pressure circuit.
Cummins ISX CM870 (2003-06) Fault Code: 2373 PID: P95 SPN: 1209 FMI: 3/3 Exhaust Gas Pressure Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the exhaust gas pressure circuit.
Cummins ISX CM870 (2003-06) Fault Code: 2372 PID: P95 SPN: 95 FMI: 0/16 Fuel filter restriction moderately high – warning. Fuel filter is plugged or fuel inlet restriction is high.
Cummins ISX CM870 (2003-06) Fault Code: 2368 PID: S82 SPN: 1112 FMI: 3/3 Engine Brake Actuator Circuit Number 3 – shorted high. Open circuit or high voltage detected at the engine brake solenoid Number 3 signal circuit.