This Cummins 442 troubleshooting manual explains Fault Code 442 for ECM battery supply voltage above the normal operating range. It covers the unswitched battery supply circuit, battery voltage checks, alternator checks, ECM calibration review, and clearing the fault with INSITE™ electronic service tool.
Official Cummins 442 troubleshooting document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated table also lists ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and other CM2150/CM2220 applications |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Unswitched Battery Supply Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 18-Jan-2011 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 442
- 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 equipment battery system.
- Guided Step 2A – Check the battery voltage.
- Guided Step 2B – Check the alternator.
- Guided Step 3 – Check ECM calibration and clear fault codes.
- Guided Step 3B – Disable the fault code.
Applicable truck models
This document applies to Cummins ISB6.7 CM2250 fault code diagnostics for Battery 1 Voltage – Data Valid But Above Normal Operational Range – Moderately Severe Level. The associated procedures table also references ECM Calibration Code procedure 019-032 for ISF2.8 CM2220, ISF3.8 CM2220, ISB4.5, ISB6.7, ISD4.5, ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISM11 CM876 SN, ISC8.3 and ISL9 CM2250, ISX15 CM2250, GX CM2250, ISZ13 CM2150, ISX11.9 CM2250, QSL9 CM2250, and QSB6.7 CM2250. The procedure identifies an ECM supply voltage above +36-VDC, with possible causes including a faulty alternator or regulator, batteries connected in series instead of parallel, or incorrect jump-starting procedure. See the official manufacturer site at Cummins.
Who needs this Cummins 442 troubleshooting manual
Workshop owners, diesel technicians, and electrical diagnostic specialists need this file when an amber CHECK ENGINE lamp is logged for SPN 168, PID P168, FMI 0/16. It is useful when verifying battery supply voltage at the OEM power harness ECM connector, checking alternator charging against OEM specifications, and confirming whether an ECM calibration update is available.
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