Cummins ISB4.5 CM2150 Fault Code: 2387 PID: SID 27 SPN: 641 FMI: 7 VGT Actuator Driver Circuit (Motor) – Mechanical System Not Responding or Out of Adjustment.

Circuit Description
The VGT is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine control module (ECM). The VGT actuator performs its own diagnostics and reports errors back to the primary engine ECM with the J1939 data link.

Component Location
The VGT actuator is located on the turbocharger bearing housing.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes
This fault code will set when the actual VGT actuator position can not meet the commanded position for more than 10 seconds.

Action Taken When the Fault Code is Active
-The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
-The VGT actuator continuously attempts to meet commanded position, even when the CHECK ENGINE lamp is ON.

Conditions for Clearing the Fault Code
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes at initial key ON.

Shop Talk
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 symptom tree, if applicable. Progressive damage to the aftertreatment system may have occurred.

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