This Cummins 2639 DPF manual is a fault-code document for aftertreatment diesel particulate filter differential pressure on CM2250 engines. It explains why Fault Code 2639 is set, how soot loading affects lamps and derate strategy, and how INSITE™ is used for regeneration and clearing checks.
Official Cummins 2639 DPF manual 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 procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; aftertreatment diesel particulate filter differential pressure sensor circuit |
| Publication no. | Bulletin numbers referenced: 4022254, 4022257, 4022250, 2883445, 4022256, 4022255 |
| Year/Revision | Last modified 11-Jun-2010 and 30-Dec-2010; file year unknown |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Fault Code 2639
- 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
- Soot Level Stage table
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Perform the stationary regeneration procedure.
- Guided Step 3 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins CM2250 engine platforms listed in the document, including ISB6.7 CM2250 as the file group and associated procedure coverage for ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The aftertreatment diesel particulate filter is installed in the exhaust system by the original equipment manufacturer, so component location details depend on the OEM service manual. For official manufacturer information, visit Cummins official website.
Who needs this Cummins 2639 DPF manual
Workshop technicians, fleet mechanics, and service managers need this document when Fault Code 2639 is active and the aftertreatment diesel particulate filter lamp indicates the first stage of soot plugging. It is useful for deciding whether to check other active faults, run an INSITE™ aftertreatment diesel particulate filter regeneration test, review ECM calibration revision history, or refer the truck to a Cummins® Authorized Repair Location.
The file describes that the ECM detects soot load above recommended limits using aftertreatment differential pressure and calculated engine soot output. It also lists possible causes such as light-load operation that prevents exhaust temperature from reaching regeneration levels and engine damage that creates excessive black smoke. The soot-stage table separates level 1 and level 2 Fault Code 2639 conditions from level 3 Fault Code 1921 and level 4 Fault Code 1922, with lamp behavior and engine protection strategy shown for each stage.
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