This Cummins 1844 fault code document is a 16-page troubleshooting guide for the crankcase pressure circuit on CM2250 engines. It explains the low-voltage fault condition, sensor location, ECM response, INSITE™ checks, harness inspections, circuit voltage tests, ECM checks, calibration review, and fault clearing steps.
Official Cummins 1844 fault code document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, ISM11 CM876 SN |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; crankcase pressure sensor and circuit |
| Publication no. | Associated bulletin numbers shown include 4022254, 4022257, 4022196, 4022250, 2883445, 4022256, and 4022255 |
| Year/Revision | Year unknown; last modified 11-Jun-2010 and 21-Jan-2011 |
| Pages | 16 |
| 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 the fault codes.
- Guided Step 2 – Check the crankcase pressure sensor and circuit.
- Guided Step 3 – Check the ECM and engine harness.
- Guided Step 4B – Disable the fault code.
Applicable truck models
The procedures apply to Cummins CM2250 engine platforms listed in the document, including ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and GX CM2250, with ISM11 CM876 SN also listed in the associated procedures table. The fault is for the crankcase pressure sensor, which is located in the crankcase filter assembly and sends a pressure-based signal voltage to the ECM. For manufacturer information, visit Cummins official website.
Who needs this Cummins 1844 fault code manual
This manual is useful for diesel technicians, fleet maintenance teams, and workshop owners diagnosing SPN 101 FMI 4/4, amber CHECK ENGINE lamp complaints, or low crankcase pressure signal voltage. It supports structured testing with INSITE™ electronic service tool, connector inspection, 4.75 to 5.25-VDC supply checks, jumper-wire circuit response checks, ECM connector testing, and ECM calibration code review.
The document states that Fault Code 1844 sets when the ECM detects crankcase pressure signal voltage below 0.25-VDC for more than 10 seconds. It also notes that the crankcase pressure sensor shares supply and return wires with other sensors, so multiple active fault codes should be checked before troubleshooting. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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