This code 1981 DTCs document is a troubleshooting manual for an aftertreatment diesel particulate filter system fault. It explains the circuit description, fault logic, service-tool checks, related sensor inspections, DPF ash maintenance, black smoke checks, ECM calibration review, and fault clearing steps for Code 1981.
Official code 1981 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250, ISX15 CM2250, GX CM2250; file listing also references ISB6.7 CM2250 (2010-12) |
| System/Group | Aftertreatment Diesel Particulate Filter System / DTCs |
| Publication no. (if present) | Not stated for the PDF; associated bulletin numbers shown include 4022250 and 2883445 |
| Year/Revision | Last modified 11-Jun-2010 and 27-Dec-2010 |
| Pages | 12 |
| 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 active fault codes
- Guided Step 2 – Inspect the aftertreatment DPF differential pressure sensor
- Guided Step 4 – Check the ash cleaning maintenance interval
- Guided Step 6 – Check ECM calibration and clear fault codes
Applicable truck models
This PDF applies to Cummins CM2250 engine applications identified in the extract, including ISX11.9 CM2250, ISX15 CM2250, and GX CM2250. The file information also lists ISB6.7 CM2250 (2010-12), but the extracted procedure pages repeatedly reference ISX11.9, ISX15, and GX associated procedures. The DPF itself is located in the exhaust system and is installed by the original equipment manufacturer, so the document directs the technician to the OEM service manual for component location details. For manufacturer information, visit the Cummins official website.
Who needs this code 1981 DTCs manual
Mechanics, fleet technicians, and workshop owners use this manual when an amber CHECK ENGINE lamp or MIL is linked to SPN 3936 FMI 15/15 and the ECM reports an aftertreatment DPF system value above the normal operating range. It supports checks with INSITE™ electronic service tool, including active fault code review, DPF differential pressure sensor accuracy at key-on engine-off, blocked sensor tubes, temperature sensor comparison, ash cleaning interval verification, and ECM calibration status.
The procedure also notes likely causes such as a plugged diesel particulate filter, incorrect aftertreatment wiring harness connections, wrong connector pin installation, light-load operation preventing regeneration, or an engine malfunction that increases smoke output. Full PDF available in the DiagTechPro manuals library, free account required to download.
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