The Cummins ISX code 3718 manual is a 8-page PDF that documents fault code 3718, the aftertreatment intake NOx sensor out of calibration fault. It explains that the aftertreatment intake 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 | 3718 (SPN 3216, FMI 13) |
| Warning lamp | Amber |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code 3718 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 intake NOx sensor is mounted on the engine near the turbocharger turbine outlet, and the sensor and NOx control module are serviced only as a single component. The reported cause is a calibration mismatch between the intake NOx sensor and the ECM; there is no direct effect on performance. For engine data and authorised service, visit the Cummins official website.
Who needs this Cummins ISX code 3718 manual
Heavy-duty diesel technicians, fleet workshops and owner-operators reach for this manual when fault code 3718 is logged and the amber warning lamp is on. It helps an emissions technician confirm the correct sensor calibration and decide when the combined sensor and control module must be replaced.
Download the ISX code 3718 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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