This code 2637 DTCs document is a troubleshooting PDF for catalyst face plugging on ISB, ISC, and ISL aftertreatment systems. It explains how the ECM detects soot plugging at the inlet face of the aftertreatment diesel oxidation catalyst and what repair checks are required. The file is useful when active diesel particulate filter regeneration is disabled and the root cause is not yet known.
Official code 2637 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; file listing identifies ISB6.7 CM2150 (2007-09) |
| System/Group | Aftertreatment System / DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 10-Jan-2011; overview page Last Modified: 20-Jul-2010 |
| Pages | 11 |
| 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 for fault codes.
- Guided Step 2 – Check the turbocharger outlet.
- Guided Step 3 – Check the exhaust system for leaks.
- Guided Step 4 – Check for excessive smoke.
- Guided Step 5 – Inspect the aftertreatment diesel oxidation catalyst.
- Guided Step 6 – Check ECM calibration and clear fault codes.
Applicable truck models
This PDF applies to Cummins ISB, ISC, and ISL engines with an aftertreatment diesel oxidation catalyst, including the ISB6.7 CM2150 coverage identified for 2007-09 in the file listing. The extract also references ISB CM2100 and CM2150 Service Manual, Bulletin 4021578, and ISC and ISL CM2150 Service Manual, Bulletin 4021569, for related inspection and service procedures. Catalyst location can vary by original equipment manufacturer, so the OEM service manual is still required for vehicle-specific exhaust layout. Official manufacturer information is available from Cummins.
Who needs this code 2637 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this code 2637 DTCs manual when diagnosing a logged SPN 3050 FMI 11/11 condition, DOC soot accumulation, exhaust leaks, excessive black smoke, or EGR and VGT related fault codes. It also supports INSITE electronic service tool checks, ECM calibration review, and the Diesel Oxidation Catalyst Maintenance Reset procedure.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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