Cummins ISC CM2150 (2007-09) Fault Code: 2387 PID: SID 027 SPN: 641 FMI: 7 VGT Actuator Driver Circuit (Motor) - Mechanical System Not Responding Properly or Out of Adjustment. The smart VGT controller has detected incorrect stop limits, or the VGT is unable to move to the closed position.

Verify the ECM calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM.

1)This fault code is set when the actual VGT actuator position does not meet the commanded position for more than 10 seconds.
2)Large boost pressure leaks can also cause this fault code.

The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system can possibly have occurred. Perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter.

1)For ISB engines, reference the ISB CM2150 Service Manual, Bulletin 4021578. Refer to Procedure 014-013 in Section 14.
2)For ISC and ISL engines reference the ISC and ISL CM2150 Service Manual, Bulletin 4021569. Refer to Procedure 014-013 in Section 14.

Inspect the aftertreatment system for potential damage.

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 component causing the charge-air system leaks.
2)Inspect the grid heater for damage or plugging. If found damaged, replace the grid heater and inspect the air handling system for debris.
3) replace the EGR cooler.
4)Replace the variable geometry turbocharger actuator.
5)Replace the turbocharger assembly.
6)Replace the damaged aftertreatment system component(s).
7)If necessary, calibrate the ECM.