This document is a fault code 239 DTCs troubleshooting procedure for the Sensor Supply 3 Circuit on CM2250 engines. It explains the voltage-above-normal fault, the ECM response, likely harness or connector causes, and INSITE™ service tool checks. The file is intended for diagnostic use when Fault Code 239, PID S232, SPN 3511, FMI 3/3 is active or stored.
Official fault code 239 DTCs document details
| Brand | Cummins |
| Model coverage | ISB6.7 CM2250; also references ISX11.9 CM2250, ISC8.3 and ISL9 CM2250, ISX15 CM2250, QSL9 CM2250, QSB6.7 CM2250, and related CM2220/CM2150 engines in the associated procedures table |
| System/Group | ISB6.7 CM2250 / DTCs / Sensor Supply 3 Circuit |
| Publication no. | 4022254 for ISB6.7 CM2250 in the associated procedures table |
| Year/Revision | Last Modified: 03-Jan-2011; summary section Last Modified: 11-Jun-2010 |
| Pages | 9 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- FAULT CODE 239 – Sensor Supply 3 Circuit – Voltage Above Normal or Shorted to High Source
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes
- Guided Step 2 – Check the ECM
- Guided Step 3 – Check ECM calibration and clear fault codes
Applicable truck models
The procedure applies to Cummins CM2250 engine diagnostics where the primary engine speed/position sensor receives its 5 volt supply from sensor supply 3. The extract specifically lists ISB6.7 CM2250 and also includes procedure references for ISC8.3 and ISL9 CM2250, ISX15 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, GX CM2250, plus several CM2220 and CM2150 engine families. For brand support and service information, visit the Cummins official website.
Who needs this fault code 239 DTCs manual
Workshop owners, diesel mechanics, and fleet technicians need this manual when diagnosing a high-voltage condition on the 5 volt sensor supply circuit to the engine speed sensor. It supports checks for active faults, ECM and engine harness connector condition, circuit response, calibration revision, and final fault clearing with INSITE™ electronic service tool.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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