The Cummins ISX code 3717 manual is a 8-page PDF that documents fault code 3717, the aftertreatment outlet NOx sensor out of calibration fault. It explains that the aftertreatment outlet NOx sensor is a smart device on the J1939 data link, and that this code is set when a calibration mismatch is detected between the sensor and the ECM. 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 | 3717 (SPN 3226, FMI 13) |
| Warning lamp | Amber |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code 3717 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 aftertreatment outlet NOx sensor is usually located at the outlet of the SCR catalyst and is serviced only with its NOx control module. The reported cause is a calibration mismatch between the outlet NOx sensor and the ECM, with no direct effect on performance. For engine data and authorised service, visit the Cummins official website.
Who needs this Cummins ISX code 3717 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators reach for this manual when fault code 3717 is logged and the amber warning lamp is on. It helps an emissions technician confirm outlet sensor calibration and decide when the combined sensor and control module need replacing.
Download the ISX code 3717 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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