This document is a Cummins 2387 fault code troubleshooting procedure for the VGT actuator driver circuit on CM2250 engines. It explains the circuit description, fault conditions, effects, clearing conditions, guided diagnostic steps, and related Cummins service procedures.
Official Cummins 2387 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, plus associated CM2250 engine models listed in the procedure table |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; VGT Actuator Driver Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250; other bulletin numbers are listed for related engine models |
| Year/Revision | Last Modified: 07-Jan-2011; troubleshooting procedure Last Modified: 21-Dec-2010 |
| Pages | 15 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes and previous service history
- Guided Step 2 – Check the variable geometry turbocharger actuator
- Guided Step 3 – Check aftertreatment system
- Guided Step 4 – Check ECM calibration and disable the fault code
Applicable truck models
The file applies to Cummins ISB6.7 CM2250 coverage and also lists associated procedures for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 engines. The diagnostic concerns Fault Code 2387, PID S027, SPN 641, FMI 7/7, where the smart VGT controller detects incorrect stop limits or the VGT cannot move to the closed position. It states that the VGT actuator is mounted on the turbocharger bearing housing and communicates with the primary engine ECM over the J1939 data link. See the manufacturer at Cummins official website.
Who needs this Cummins 2387 fault code manual
This manual is for diesel mechanics, fleet shops, and workshop owners diagnosing a VGT actuator driver circuit fault, limited VGT travel, disabled regeneration, closed EGR valve operation, or torque reduction related to this fault. It is useful when checking INSITE™ fault status, actuator installation position, EGR-related fault codes, boost pressure leaks, exhaust restriction, connector damage, turbocharger nozzle movement, aftertreatment damage, and ECM calibration revision.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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