This Cummins 3717 NOx sensor troubleshooting document provides the complete diagnostic procedure for Fault Code 3717 — Aftertreatment Outlet NOx Sensor Out of Calibration — on CM2250-equipped engines. It covers circuit description, fault conditions, guided troubleshooting steps, and ECM calibration verification across multiple engine platforms.
Official Cummins 3717 NOx sensor document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX11.9 CM2250, ISX15 CM2250, ISF2.8 CM2220, ISF3.8 CM2220, QSB6.7 CM2250, QSL9 CM2250, GX CM2250 |
| System / Group | Aftertreatment — Diagnostic Trouble Codes (DTCs) |
| Publication no. | Bulletin 4022254 (ISB6.7 CM2250) |
| Year / Revision | Last modified 19-Jan-2011 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3717 — Code Reason, Effect, SPN 3226, FMI 13
- 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 — Possible Causes
- Associated Procedures Table (Procedure 019-032, Procedure 019-451)
- Guided Step 1 — Check the Fault Codes (Step 1A: Check for Active Fault Code 3681)
- Guided Step 2 — Check the Aftertreatment Outlet NOx Sensor Circuit (Steps 2A–2C)
- Guided Step 3 — Check ECM Calibration and Clear Fault Codes (Steps 3A–3B)
Applicable truck models
Fault Code 3717 applies to Cummins engines using the CM2250 electronic control module, including the ISB6.7, ISC8.3, ISL9, ISX11.9, ISX15, and GX CM2250 platforms. The CM2220 variants — ISF2.8 and ISF3.8 — are also referenced in the associated procedures table. The aftertreatment outlet NOx sensor is available in 12-volt and 24-volt versions; correct voltage must match the engine CPL. Workshop owners should verify part compatibility using INSITE™ electronic service tool before replacing the sensor. For additional engine specifications and service network information, visit Cummins official website.
Who needs this Cummins 3717 NOx sensor manual
Diesel technicians and workshop owners diagnosing an amber CHECK ENGINE lamp caused by SPN 3226 / FMI 13 on CM2250-controlled trucks need this guide. It walks through calibration mismatch verification, electrical system voltage parameter checks, sensor replacement references (Procedure 019-451), and ECM calibration updates (Procedure 019-032) — all required steps before contacting a Cummins Authorized Repair Location.
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