This Cummins fault code 239 document is a diagnostic troubleshooting manual for the Sensor Supply 3 Circuit on ISB, ISC, and ISL engines. It explains the code reason, ECM response, connector inspection, circuit response checks, and fault-code clearing steps using INSITE™ electronic service tool.
Official Cummins fault code 239 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL; file group: ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; Sensor Supply 3 Circuit – Voltage Above Normal or Shorted to High Source |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 7 |
| 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
- 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 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB, ISC, and ISL engines, with the library group identifying ISB6.7 CM2150 (2007-09) DTC coverage. The document states that sensor supply 3 is located in the ECM and that the supply voltage is spliced in the engine harness to each supported sensor, including the primary engine speed/position sensor. For official engine and service information, visit Cummins official website.
Who needs this Cummins fault code 239 manual
Workshop technicians need this Cummins fault code 239 manual when an amber CHECK ENGINE light is active and INSITE™ reports PID S232, SPN 3511, FMI 3/3. It is also useful for fleet repair managers checking whether the cause is a connector fault, short to battery voltage, engine harness issue, or damaged ECM.
The diagnostic sequence starts with checking whether Fault Code 239 is active, then inspecting the ECM and engine harness connector pins for loose connectors, corrosion, bent or broken pins, pushed-back or expanded pins, moisture, damaged seals, debris, insulation damage, a broken connector shell, or a damaged locking tab. The circuit response check requires the engine harness to be disconnected from the ECM connector, the keyswitch turned ON, and INSITE™ used to read fault codes after 30 seconds. If the code remains active, the procedure directs authorization to replace the ECM; if it becomes inactive, the document points to a short circuit to a voltage source in the engine harness sensor supply 3 wire. The final guided step reconnects components, idles the engine for 1 minute, verifies the code is inactive, and clears inactive fault codes.
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