Cummins fault code 3545 is the official Cummins ISX11.9 CM2250 troubleshooting document for the aftertreatment outlet nox sensor circuit, reported as SPN 3226, FMI 10 (“Abnormal Rate of Change”) and lights the amber warning lamp. This 6-page PDF covers the circuit description, the conditions that set the code, and the guided troubleshooting sequence run with INSITE electronic service tool.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250 (2010-12), also ISX12 CM2250 (2010-12) |
| System / group | Aftertreatment Outlet NOx Sensor — DTC diagnostics |
| Fault code | 3545 (SPN 3226, FMI 10) |
| Publication no. | 4022254, 4022257, 4022250, 2883445 |
| Year / revision | Last modified 30-Nov-2010 |
| Pages | 6 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 3545 means
The aftertreatment outlet NOx (nitrogen oxides) sensor is a smart device and communicates with the engine electronic control module (ECM) via the J1939 data link. When the abnormal rate of change condition is detected, SPN 3226 / FMI 10 is logged. The document explains the component location, when the diagnostic runs, and how the code is validated and cleared after a repair.
Document table of contents
- 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 troubleshooting steps with INSITE electronic service tool
Applicable truck models and engines
This procedure applies to Cummins ISX11.9 CM2250 (2010-12) engines and the related ISX12 CM2250 build, with equivalent aftertreatment procedures across the CM2250 family (ISB6.7, ISC8.3, ISL9, ISX15). The Associated Procedures table cites publication 2883445 for the ISX11.9 CM2250 application. Confirm the ECM calibration revision before condemning a part; see Cummins official engine support for calibration details.
Who needs this Cummins fault code 3545 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators use this document to diagnose SCR and diesel exhaust fluid faults on ISX11.9 CM2250 trucks without guessing. It turns the dashboard warning into a clear, step-by-step repair path.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download.
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