This VGT actuator fault DTCs document is a diagnostic procedure for Fault Code 2635 on Cummins ISB, ISC, and ISL engines using a variable geometry turbocharger actuator. It explains the circuit description, fault conditions, ECM calibration checks, INSITE™ service tool steps, and clearing procedure for a red STOP ENGINE light event.
Official VGT actuator fault DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); ISB, ISC, and ISL references in the procedure |
| System/Group | DTCs; ISB, ISC, and ISL – VGT Actuator Circuit |
| Publication no. | Not shown; related service manual bulletin 4021569 is referenced |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 5 |
| 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 ECM calibration.
- Guided Step 2 – Clear the fault code.
Applicable truck models
This PDF applies to Cummins ISB6.7 CM2150 engines in the 2007-09 group and also references ISB, ISC, and ISL VGT actuator circuit diagnostics. The fault code is listed as 2635, PID S027, SPN 641, FMI 11/31, with a red lamp and VGT actuation disabled when active. The document states that the VGT actuator is mounted on the turbocharger bearing housing and communicates with the primary engine ECM over the J1939 datalink. For official product and service information, visit Cummins official website.
Who needs this actuator fault DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this manual when diagnosing a calibration mismatch, incorrect actuator voltage application, or wrong VGT actuator installed on the turbocharger. It is useful when INSITE™ electronic service tool checks are required to confirm the ECM code for the engine CPL, disable an inactive fault, or clear inactive fault codes after repair.
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