This Cummins 2777 fault document is a troubleshooting PDF for Fault Code 2777, Particulate Trap Active Regeneration Inhibited Due to Inhibit Switch. It explains why active regeneration of the diesel particulate filter can be prevented by a permit switch or by an inhibit message sent over the J1939 data link. The file also lists the INSITE checks, clearing conditions, and associated Cummins procedures referenced by the diagnostic.
Official Cummins 2777 fault document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedure tables. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment System |
| Publication no. | Not stated in the file extract; associated bulletin numbers include 4022254, 4022257, 4022250, 2883345, 4022256, and 4022255. |
| Year/Revision | Year unknown; last modified dates shown as 11-Jun-2010 and 30-Dec-2010. |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Fault Code 2777 – Particulate Trap Active Regeneration Inhibited Due to Inhibit Switch – Condition Exists
- 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.
- Guided Step 2 – Check ECM calibration and clear fault codes.
- Guided Step 2B – Disable the fault code.
Applicable truck models
This document applies to Cummins CM2250 engines and aftertreatment diagnostics identified in the extract, including ISB6.7 CM2250 and associated procedure coverage for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The aftertreatment diesel particulate filter location and the permit switch installation depend on the OEM truck manufacturer, so the document directs technicians to the OEM service manual when the inhibit switch is a dash switch or a J1939 message. For manufacturer information, visit Cummins official website.
Who needs this Cummins 2777 fault manual
This Cummins 2777 fault manual is for diesel mechanics, fleet technicians, and workshop owners diagnosing active or logged high soot load events where mobile regeneration was inhibited. It is useful when checking INSITE fault status, ECM calibration revision, aftertreatment testing, exhaust system diagnostics, and permit switch setup.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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