The Cummins fault code 442 troubleshooting manual is the official Cummins diagnostic procedure for the battery 1 voltage supply circuit on the ISX11.9 CM2250 engine platform. The ECM receives constant unswitched battery voltage through fused wires connected directly to the positive battery post and monitors that supply voltage continuously. This 8-page PDF walks a technician from symptom to verified repair.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12) |
| System / Group | battery 1 voltage supply circuit, DTCs |
| Fault code reference | Fault Code 442 — SPN 168, FMI 0 |
| Warning lamp | an amber warning lamp |
| Revision (Last Modified) | 11-Jun-2010 |
| Pages | 8 |
| File size | 0.25 MB |
| Format | |
| Language | English |
Cummins fault code 442 document contents
- Overview and Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Code
- Action Taken When the Fault Code Is Active
- Conditions for Clearing the Fault Code
- Shop Talk and possible causes
- Associated Procedures table
- Guided troubleshooting steps
- Verify the repair
Applicable truck models covered
This procedure applies to Cummins engines that report Fault Code 442 (SPN 168, FMI 0), including the Cummins ISX11.9 CM2250 (2010-12), Cummins ISX12 CM2250 (2010-12). Always confirm the exact calibration and publication for your engine on the official Cummins engine support site before ordering parts.
Common causes and symptoms
This moderately severe fault is logged when the monitored battery voltage stays above the normal operational range, which points at a charging-system overvoltage condition. Shop Talk in the document lists the most likely causes:
- Charging-system overvoltage from the alternator or voltage regulator
- Incorrect battery or charging configuration
Who needs the Cummins fault code 442 manual
Diesel technicians and workshop owners diagnosing Fault Code 442 on ISX11.9 CM2250 trucks need this manual to follow the guided steps, use the correct connector pins and verify the repair with INSITE electronic service tool instead of guessing.
Downloading the complete procedure gives you the exact wiring diagrams, connector pin identification and INSITE service-tool checks referenced throughout the document. The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
Related manuals library
Sản phẩm liên quan cho hãng này
Cùng brand theo taxonomy hiện có trong catalog WooCommerce.
Cummins Calterm Version 5.16 – Advanced ECM Control and Precision Tuning for Cummins Engines
Cummins INSITE 9.3 – The Essential Diagnostic Tool for Cummins Engines
Cummins InCal CE – The Calibration and Configuration Tool for Cummins Engines
