This Cummins Fault 441 document is a troubleshooting manual for Battery 1 Voltage below normal operating range on CM2250 engines. It explains the ECM unswitched battery supply circuit, conditions for setting and clearing the code, and guided checks for battery, fuse, OEM power harness, connectors, calibration, and fault clearing.
Official Cummins Fault 441 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated procedures also list ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other Cummins engine families shown in the procedure table. |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Unswitched Battery Supply Circuit |
| Publication no. | Bulletin 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting procedure Last Modified: 04-Jan-2011 |
| Pages | 14 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 441 – Battery 1 Voltage – Data Valid But Below Normal Operating Range – Moderately Severe Level
- 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 battery.
- Guided Step 2 – Check the fuse.
- Guided Step 3 – Check the OEM power harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This PDF applies to Cummins CM2250 diagnostic work where Fault Code 441 / PID P168 / SPN 168 / FMI 1/18 is logged because ECM supply voltage is below the minimum system voltage level. The extract identifies ISB6.7 CM2250 as the listed model coverage and also references the same Battery 1 Voltage procedure across ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, and QSB6.7 CM2250 entries in the associated procedures table. Battery location and some harness routing depend on the original equipment manufacturer, so the procedure repeatedly points technicians to the OEM service manual for vehicle-specific information. See the manufacturer site at Cummins official website.
Who needs this Cummins Fault 441 manual
Workshop owners, diesel mechanics, and electrical diagnostic technicians need this manual when a Cummins CM2250 engine logs an amber CHECK ENGINE light for low ECM battery supply voltage. It supports step-by-step checks for loose or corroded battery terminals, cranking voltage, the 30-ampere fuse, open circuits, shorts to ground, pin-to-pin shorts, accessory wiring at the positive battery terminal, and INSITE™ fault clearing.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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