This document is a code 598 DTCs troubleshooting manual for the ISB6.7 CM2150 ECM power supply circuit. It explains the red STOP ENGINE light condition caused by very low battery voltage and gives guided checks for batteries, alternator output, OEM harness wiring, and inactive fault clearing with INSITE™.
Official code 598 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; ECM Power Supply Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 11 |
| File size | 0.3 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 equipment battery system.
- Guided Step 2 – Check the alternator and OEM harness.
- Guided Step 3 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 engines from the 2007-09 coverage group, with supporting text that also names ISB, ISC, and ISL with CM2150. The procedure is for Fault Code: 598, PID: P167, SPN: 167, FMI: 1/1, where the ECM detects battery voltage less than 8 VDC and immediately illuminates the red STOP ENGINE light while the diagnostic runs and fails. For official manufacturer information, visit Cummins official website.
Who needs this code 598 DTCs manual
Workshop owners, diesel technicians, and fleet mechanics need this 598 DTCs manual when diagnosing undercharged batteries, alternator or regulator faults, unswitched battery supply circuit problems, or OEM power harness shorts. It is useful when checking battery cable corrosion, alternator charging rate, connector pin damage, open circuits under 10 ohms, pin-to-pin shorts over 100k ohms, and add-on wiring at the positive battery terminal.
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