The Cummins ISX code 3724 manual is a 7-page PDF that documents fault code 3724, the battery 1 voltage fault reported as data valid but below normal operating range at the least severe level. It explains that the EGR valve device driver inside the ECM powers the EGR valve motor, and that this code is set when the ECM detects low voltage at that device driver. The procedure is credited to TruckFaultCodes.com and covers the circuit description, component location and full troubleshooting steps.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISX11.9 CM2250 and ISX12 CM2250 (2010-12) engines |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 3724 (PID P168, SPN 168, FMI 17) |
| Warning lamp | Amber |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code 3724 description
- Circuit description and ECM operation
- Component location
- Shop talk and possible causes
- Step-by-step troubleshooting flow
Applicable truck models
This diagnostic applies to Cummins ISX11.9 CM2250 and ISX12 CM2250 (2010-12) engines. The EGR valve device driver is internal to the ECM and cannot be serviced separately. While active, EGR valve actuation is disabled and the EGR valve defaults to the closed position. For engine data and authorised service, visit the Cummins official website.
Who needs this Cummins ISX code 3724 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators reach for this manual when fault code 3724 is logged and the amber warning lamp is on. It helps a technician trace low supply voltage to the EGR driver, checking batteries, cables and grounds before suspecting the ECM.
Download the ISX code 3724 PDF
The complete procedure, wiring detail and step tables are available in the DiagTechPro manuals library; a free account is required to download the PDF. Keep it alongside the related ISX11.9 CM2250 fault-code sheets listed below.
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