Cummins ISB CM850 (2003-06) Fault Code: 2558 PID: SID 57 SPN: 697 FMI: 4 Auxiliary PWM Driver #1 – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the analog torque circuit.
Possible causes:
1)A faulty transmission shift modulator
2)An short circuit to ground on the output device driver line
3)A short pin to pin in the output device driver line.
Possible repairs:
1)Replace the transmission shift modulator.
2)Repair or replace the OEM harness.
3)The removal and installation of the connector may correct the fault.
4)Replace the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 2557 PID: SID 57 SPN: 697 FMI: 3 Auxiliary PWM Driver #1 – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the analog torque 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.
Cummins ISB CM850 (2003-06) Fault Code: 2555 PID: SID 70 SPN: 729 FMI: 3 Intake Air Heater #1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the intake air heater signal circuit.
Cummins ISB CM850 (2003-06) Fault Code: 2554 PID: 95 SPN: 1209 FMI: 2 Exhaust pressure sensor circuit – data erratic, intermittent, or incorrect. An error in the exhaust pressure sensor signal was detected by the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 2448 PID: SPN: 111 FMI: 17 Coolant Level – Data Valid But Below Normal Operational Range – Least Severe Level. Low engine coolant level detected.
Cummins ISB CM850 (2003-06) Fault Code: 2388 PID: SID 269 SPN: 2795 FMI: 13 Variable Geometry Turbocharger actuator position failed automatic calibration procedure – out of calibration.
