The Cummins fault code 2635 troubleshooting document is a 2-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering VGT actuator driver circuit (SPN 641, FMI 11/31). This fault code is logged when the ECM detects that an incorrect variable geometry turbocharger (VGT) actuator has been installed. This page summarises what the manual contains so a technician can confirm it matches the code before downloading.
Official document details
| Brand | Cummins |
| Model coverage | ISM & ISX CM871 (2007-09) |
| System / group | ISM CM871 (2007-09) / DTCs |
| Circuit | ISX and ISM VGT Actuator Circuit |
| Fault identifiers | SPN 641 · Lamp RED · FMI 11/31 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Cummins fault code 2635 overview
This fault code is logged when the ECM detects that an incorrect variable geometry turbocharger (VGT) actuator has been installed. The VGT actuator is a smart device that receives commands over the J1939 data link, runs its own diagnostics, and reports errors back to the primary engine ECM. Verify the ECM calibration is correct for the engine CPL.
The document lists possible causes including:
- An incorrect VGT actuator installed on the turbocharger
- An ECM code calibration voltage incorrect for the application (a 24-volt calibration in a 12-volt system)
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models covered
This procedure applies to Cummins ISM and ISX engines built on the CM871 (2007-09) electronic control platform, as fitted by truck makers using this Cummins driveline. The VGT actuator is located on the turbocharger bearing housing. For wiring, connector, and CPL detail, refer to the Cummins official engine support site or the OEM service manual.
Who needs this Cummins fault code 2635 manual
Fleet technicians and workshop owners diagnosing an incorrect VGT actuator on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the variable geometry turbocharger circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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