This Cummins 3718 NOx sensor document is an 8-page troubleshooting guide for Fault Code 3718 — Aftertreatment Intake NOx Out of Calibration — on CM2250-controlled diesel engines. It provides circuit descriptions, diagnostic conditions, step-by-step guided repair procedures, and fault-clearing instructions for mechanics working with the aftertreatment intake NOx sensor system.
Official Cummins 3718 NOx sensor document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250, ISC8.3 CM2250, ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250 |
| System/Group | Aftertreatment / Diagnostic Trouble Codes (DTCs) |
| Publication no. | — |
| Year/Revision | Last modified 14-Jan-2011 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview — Circuit Description and Component Location
- Fault Code 3718 — Aftertreatment Intake NOx Out of Calibration (SPN 3216, FMI 13)
- Conditions for Running the Diagnostics
- Conditions for Setting and Clearing the Fault Code
- Shop Talk — Possible Causes
- Associated Procedures Table (Procedure 019-032 ECM Calibration Code, Procedure 019-463 Aftertreatment Intake NOx Sensor)
- Step 1 — Check Active Fault Codes via INSITE™
- Step 2A — Check Adjustable Parameter Settings (Electrical System Voltage)
- Step 2B — Verify Correct Aftertreatment Intake NOx Sensor (12V or 24V)
- Step 2C — Check Sensor Condition
- Step 3A — Check ECM Calibration Update Availability
- Step 3B — Disable and Clear the Fault Code
Applicable truck models
Fault Code 3718 applies to multiple Cummins engine platforms equipped with CM2250 electronic control modules. The guide explicitly references the ISB6.7 CM2250 (2010–2012), ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, and GX CM2250 engines. The aftertreatment intake NOx sensor is mounted near the turbocharger turbine outlet and is available in 12-volt or 24-volt versions depending on the engine CPL. Associated bulletin numbers include 4022254, 4022257, 4022250, 2883445, 4022256, and 4022255. For official parts lookup and service network information, visit Cummins Support.
Who needs this Cummins 3718 NOx sensor manual
Diesel mechanics and workshop owners diagnosing an amber CHECK ENGINE lamp triggered by Fault Code 3718 on CM2250 engines need this guide. It walks through each verification step — from confirming the fault with INSITE™ electronic service tool, through voltage parameter and sensor part-number checks, to ECM calibration revision comparison and fault code clearing.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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