fault code 2387 DTCs is documented in this official Cummins ISX11.9 CM2250 diagnostic and troubleshooting manual. The 15-page PDF explains the VGT Actuator Driver Circuit (Motor) – Mechanical System Not Responding or Out of Adjustment condition on the VGT actuator driver circuit, including the SPN, FMI and PID identifiers a technician reads with the Cummins INSITE electronic service tool.
fault code 2387 DTCs document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System / group | VGT actuator driver circuit |
| Fault code | 2387 (PID S027) |
| SPN | SPN 641 |
| FMI | FMI 7/7 |
| Warning lamp | Amber |
| Pages | 15 |
| Revision | Last modified 07-Jan-2011 |
| Format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures table
- Guided troubleshooting steps
Common causes and symptoms
- Incorrect stop limits detected by the smart VGT controller
- A VGT that is unable to move to the closed position
- Large boost pressure leaks, after which the aftertreatment system must be inspected for damage
Applicable truck models and engines
This document applies to the ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 engine families running the CM2250 electronic control module. When SPN 641 / FMI 7/7 sets, variable geometry turbocharger travel may be limited. Coverage and part numbers should always be verified against current service data on the Cummins official support site before ordering components.
Who needs this fault code 2387 DTCs manual
Fleet technicians, mobile mechanics and workshop owners use this code 2387 DTCs reference to confirm the variable geometry turbocharger actuator diagnosis before replacing parts, and to follow the same clearing steps Cummins publishes for INSITE. Reading the live data and freeze-frame with INSITE before any parts replacement helps avoid unnecessary repairs and repeat shop visits. The revision date of 07-Jan-2011 and the SPN, FMI and PID values make it a reliable bench reference for ISX11.9 CM2250 diagnostics.
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