This Cummins fault code 598 PDF is the official Battery Voltage Monitor – Very Low Voltage troubleshooting chart for the Cummins ISM CM570 (1999-02) engine platform, covering PID P167, SPN 167, FMI 1/1 and the Red warning lamp. It is a step-by-step diagnostic flow, not a general manual, and it takes a technician from symptom to confirmed repair on this specific code.
Cummins fault code 598 explained
The ECM receives unswitched battery input through the OEM harness, protected by two in-line 15-amp fuses, and this code signals a very low supply voltage. The ECM is connected to the battery through the OEM harness; the battery location varies by OEM, so the OEM manual should be used to find it. Confirm the unswitched battery supply comes directly from the battery and not the starter; undercharged batteries caused by a faulty alternator or regulator are a common cause.
Official document details
| Brand | Cummins |
| Model coverage | ISM, ISX and Signature CM570 (1999-02) |
| System / Group | DTCs — Battery Voltage Monitor – Very Low Voltage |
| Fault identifiers | Fault Code 598, PID P167, SPN 167, FMI 1/1, Red lamp |
| Source / Revision | TruckFaultCodes.com, Copyright 2017 |
| Pages | 5 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit Description
- Component Location
- Shop Talk
- Troubleshooting Steps
- Fault code verification and clearing
Applicable truck models
This chart applies to on-highway trucks and equipment built on the Cummins ISM, ISX and Signature CM570 (1999-02) engines with the CM570 electronic control module. Because component and battery locations vary by chassis maker, the document repeatedly refers you to the OEM manual for exact positions. For engine specifications and dealer support, see the official Cummins engine site.
Who needs this Cummins fault code 598 manual
Heavy-duty diesel technicians and workshop owners servicing ISM, ISX or Signature CM570 engines need this chart to diagnose the Battery Voltage Monitor – Very Low Voltage correctly instead of guessing at parts. It pairs with a diagnostic scan tool and standard shop meters.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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