This Cummins 1921 troubleshooting manual explains Fault Code 1921 for aftertreatment diesel particulate filter differential pressure on CM2250 engines. It covers the code reason, lamp response, derate effect, soot stages, INSITE™ checks, stationary regeneration, ECM calibration review, and fault clearing steps.
Official Cummins 1921 troubleshooting manual document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit |
| Publication no. | Associated bulletin numbers shown: 4022254, 4022257, 4022250, 2883445, 4022256, 4022255 |
| Year/Revision | Year unknown; Last Modified: 11-Jun-2010 and 19-Jan-2011 |
| Pages | 9 |
| 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
- Aftertreatment System Soot Stages
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the duty cycle of the application.
- Guided Step 3 – Perform the stationary regeneration procedure.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This document applies to Cummins CM2250 engine platforms listed in the extract, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The component location states that the aftertreatment diesel particulate filter is installed by the OEM in the exhaust system, so vehicle-specific mounting details must be checked in the OEM service manual. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1921 troubleshooting manual
Workshop owners, diesel technicians, and fleet mechanics use this file when an amber CHECK ENGINE lamp, flashing aftertreatment lamp, and engine protection derate are linked to Fault Code 1921. The procedure supports decisions on active fault checks, aftertreatment trip information, duty cycle correction, stationary regeneration, Snap Acceleration Test follow-up, and ECM Calibration Code review.
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