The Cummins fault code 2777 troubleshooting document is a 2-page factory diagnostic reference for the Cummins ISM and ISX CM871 (2007-09) engine platform, covering particulate trap regen inhibited (SPN 3703, FMI 11/31). This fault code informs the technician that the regeneration permit (inhibit) switch was disabled when Fault Code 1921, 1922, or 2639 was active. 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 Aftertreatment System |
| Fault identifiers | SPN 3703 · FMI 11/31 |
| Source | TruckFaultCodes.com (© 2017) |
| Pages | 2 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Cummins fault code 2777 overview
This fault code informs the technician that the regeneration permit (inhibit) switch was disabled when Fault Code 1921, 1922, or 2639 was active. The OEM may fit a dash permit switch or send an inhibit message over the J1939 data link to prevent mobile regenerations. Verify the ECM calibration is correct and consult the OEM if aftertreatment damage resulted.
The document lists possible causes including:
- The regeneration permit switch was disabled by the operator
- An OEM inhibit message sent over the J1939 data link
- A high aftertreatment soot load fault (1921, 1922, or 2639) left unresolved
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 aftertreatment diesel particulate filter is in the exhaust; the permit switch may be a dash switch or a J1939 message. 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 2777 manual
Fleet technicians and workshop owners diagnosing an inhibited particulate trap regeneration on ISM or ISX CM871 engines use this reference to follow the factory step order instead of guessing at the diesel particulate filter circuit. The full PDF is available in the DiagTechPro manuals library, and a free account is required to download.
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