This Code 1881 document explains Fault Code 1881 diagnostics for the aftertreatment diesel particulate filter differential pressure sensor circuit. It covers the low-voltage or short-to-low-source fault condition, related ECM actions, guided electrical checks, and repair validation using INSITE™ electronic service tool.
Official Code 1881 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; also lists ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 in associated procedures |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Aftertreatment Differential Pressure |
| Publication no. | 4022254 for ISB6.7 CM2250 associated procedures |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting step revision shown as 19-Jan-2011 |
| Pages | 16 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 1881 – Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit – Voltage Below Normal or Shorted to Low Source
- 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 the aftertreatment diesel particulate filter differential pressure sensor and circuit
- Guided Step 3 – Check the ECM and OEM harness
- Guided Step 4B – Disable the fault code
Applicable truck models
This file is written around Cummins CM2250 engines and specifically identifies ISB6.7 CM2250 coverage for Bulletin Number 4022254. The associated procedures table also references ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250 applications, with ECM Calibration Code Procedure 019-032 and Aftertreatment Particulate Trap Differential Pressure Sensor Procedure 019-443. For engine family information, visit the official Cummins website.
Who needs this Code 1881 manual
Workshop technicians need this ISB6.7 fault code manual when diagnosing SPN 3251 FMI 4/4, PID S324, or an amber lamp caused by low aftertreatment diesel particulate filter differential pressure sensor signal voltage. The guided steps support connector inspection, 4.75 to 5.25-VDC supply checks, circuit response testing for Fault Code 1879, OEM harness resistance checks below 10 ohms, short checks above 100k ohms, ECM calibration verification, and final clearing of Fault Code 1881.
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