Cummins ISB 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.

Possible causes:

1)Malfunctioned turbocharger position sensor, and mechanical or electrical malfuction.
2)Turbocharger actuator motor assembly malfunction, requiring a high current to operate the turbocharger, such as a stuck or sticking turbocharger.

Inspect the turbocharger vanes for residue, and clean the vanes, if required. Find the source of the residue and repair.

Possible repairs:

1)Repair or replace the engine harness.
2)Replace the ECM.
3)Repair or replace the turbocharger.

Cummins ISB CM850 (2003-06) Fault Code: 2386 PID: SPN: 2975 FMI: 6 Turbocharger actuator motor circuit - current is above normal. Excessive current detected at the turbocharger actuator motor circuit.

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.

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.

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