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Cummins ISL CM850 (2003-06) Fault Code: 2387 PID: SID 146 SPN: 2975 FMI: 7 Turbocharger actuator motor - the mechanical system is not responding properly or is out of adjustment. Turbocharger actuator is not responding or is slow to respond.

Cummins ISL 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.

Cummins ISL 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 ISL 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 ISL 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 ISL 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 ISL 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 ISL 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.

Cummins ISL CM850 (2003-06) Fault Code: 2559 PID: SPN: 1845 FMI: 4 Transmission ECU to ECM Communication Lost - Abnormal Update Rate. No communication or an invalid data transfer rate has been detected between the ECM and the transmission ECU.

Cummins ISL CM850 (2003-06) Fault Code: 2771 PID: SPN: 3234 FMI: 9 Aftertreatment Outlet NOx Sensor - Abnormal Update Rate. No communications or valid data transfer rate detected on the J1939 datalink between the ECM and the aftertreatment outlet NOx sensor.