This 7-page PDF is the official Cummins ISB6.7 Fault 3725 troubleshooting procedure for the aftertreatment intake NOx sensor reporting an abnormal rate of change. The document provides circuit descriptions, diagnostic conditions, step-by-step guided fault isolation, and ECM calibration verification for CM2250-controlled engines. It applies to multiple Cummins engine platforms sharing the CM2250 control module.
Official Cummins ISB6.7 Fault 3725 document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250 |
| System / Group | Aftertreatment Intake NOx Sensor Circuit — Diagnostic Trouble Codes (DTCs) |
| Publication no. | Not specified (Bulletin references: 4022254, 4022257, 4022250, 2883445, 4022256, 4022255) |
| Year / Revision | Last modified 01-Dec-2010 (overview) / 30-Nov-2010 (troubleshooting) |
| Pages | 7 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3725 Summary — PID P102, SPN 3216, FMI 10, Amber Lamp
- Conditions for Running the Diagnostics (exhaust temperature above 150 °C / 302 °F)
- Conditions for Setting and Clearing the Fault Code
- Shop Talk — Related Fault Codes 1885, 3232, 3681
- Associated Procedures Table (Procedure 019-032 ECM Calibration Code, Procedure 019-463 Aftertreatment Intake NOx Sensor)
- Step 1 — Check Fault Codes (Steps 1A and 1B)
- Step 2 — Check ECM Calibration and Clear Fault Codes (Steps 2A and 2B)
Applicable truck models
Fault Code 3725 applies to any vehicle or machine equipped with a Cummins CM2250 electronic control module across these engine families: ISB6.7, ISC8.3, ISL9, ISX15, ISX11.9, QSL9, and QSB6.7. The ISB6.7 CM2250 variant (2010–2012 production) is the primary focus. These engines are found in medium- and heavy-duty trucks, buses, and industrial equipment. The aftertreatment intake NOx sensor is mounted near the turbocharger turbine outlet. For official parts lookup and service network information, visit Cummins official website.
Who needs this Cummins ISB6.7 Fault 3725 manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE lamp tied to SPN 3216 / FMI 10 need this procedure. It walks through verifying related fault codes (1885, 3232, 3682), confirming ECM calibration revisions via INSITE™, and determining whether the NOx sensor assembly requires replacement.
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