This Fault Code 441 DTCs document is a troubleshooting manual for Battery 1 Voltage below normal on CM2150 engines. It explains the ECM unswitched battery supply circuit, fault conditions, battery and fuse checks, OEM power harness testing, and clearing the inactive code with INSITE™.
Official Fault Code 441 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Unswitched Battery Supply |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 13 |
| File size | 0.4 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 battery.
- Guided Step 2 – Check the fuse.
- Guided Step 3 – Check the OEM power harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group and the extract also names ISB, ISC, and ISL with CM2150 for the unswitched battery supply fault. The document is organized around ECM supply voltage below 6-VDC, the 30-ampere fuse, battery terminal condition, battery voltage during normal and cranking conditions, and resistance checks at ECM battery SUPPLY pins in the OEM power harness. For official manufacturer information, visit Cummins official website.
Who needs this Fault Code 441 DTCs manual
Workshop owners, fleet mechanics, and diagnostic technicians need this Code 441 DTCs manual when an amber fault reports Battery 1 Voltage – Data Valid but Below Normal Operational Range – Moderately Severe Level. It is useful when the engine may stop running, is difficult to start, or logs a low ECM supply voltage fault during keyswitch ON or engine running conditions.
The guided tests cover battery connections, battery voltage, correct 30-ampere fuse installation, blown fuse inspection, connector pin condition, open circuits below 10 ohms, and short circuit checks requiring greater than 100k ohms. The repair paths refer to OEM troubleshooting information, OEM Wiring Harness procedure 019-071, Fuse, Harness In-Line procedure 019-198, Component Connector and Pin Inspection procedure 019-361, and Resistance Measurements Using a Multimeter procedure 019-360. Full PDF available in the DiagTechPro manuals library, free account required to download.
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