Cummins ISB CM850 (2003-06) Fault Code: 2385 (ISC) PID: SID 27 SPN: 641 FMI: 3 VGT Actuator – Voltage Above Normal or Shorted to High Source. Open circuit or high voltage detected at turbocharger control valve circuit.

Posted by PerDiezel Solutions on January 18, 2026

Turbocharger control valve command can be monitored with the INSITE? electronic service tool. This parameter represents the ECM command to the turbocharger control valve, which in turn controls the variable geometry actuator position.

Possible causes:

1)Open circuit in the engine harness or connectors
2)Open circuit in the turbocharger control valve
3)Signal circuit short to voltage source in the engine harness.

Possible repairs:

1)Replace the turbocharger control valve.
2)The removal and installation of the connector may correct the fault.
3)Replace the ECM.
4)Repair or replace the engine harness.

Cummins ISB CM850 (2003-06) Fault Code: 2385 (ISB) PID: SID 27 SPN: 641 FMI: 3 VGT actuator driver circuit – voltage above normal or shorted to high source.

Cummins ISB CM850 (2003-06) Fault Code: 2384 (ISC) PID: SID 27 SPN: 641 FMI: 4 VGT Actuator – Voltage Below Normal or Shorted to Low Source. Low voltage detected at turbocharger control valve circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2384 (ISB) PID: SID 27 SPN: 641 FMI: 4 VGT actuator driver circuit – voltage below normal, or shorted to low source.

Cummins ISB CM850 (2003-06) Fault Code: 2383 PID: SID 27 SPN: 641 FMI: 5 Variable Geometry Turbocharger actuator circuit – current below normal, or open circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2382 PID: SPN: 2795 FMI: 4 Turbocharger position sensor circuit – shorted low. Low signal voltage detected at the turbocharger position sensor circuit.

Cummins ISB CM850 (2003-06) Fault Code: 2381 PID: SPN: 2795 FMI: 4 Turbocharger position sensor circuit – shorted high. High signal voltage detected at the turbocharger position sensor circuit.

WARNING!