Cummins fault code 265 is documented on this DiagTechPro library page for Cummins ISM CM871 (2007-09) engines, where it flags a Engine Fuel Temperature Sensor 1 Circuit – Voltage Below Normal Or Shorted To Low Source condition (PID P174, SPN 174, FMI 4/4, Amber lamp). This 5-page PDF reproduces the manufacturer description, shop talk, component location and step-by-step troubleshooting so technicians can confirm and clear the code.
Cummins fault code 265 overview
Cummins defines this code as “ENGINE FUEL TEMPERATURE SENSOR 1 CIRCUIT – VOLTAGE BELOW NORMAL OR SHORTED TO LOW SOURCE” on the Engine Fuel Temperature Sensor 1 Circuit. The engine fuel temperature sensor is used by the electronic control module (ECM) to monitor the engine fuel temperature. Fuel temperature is used by the ECM to adjust fuel delivery to the injectors. The engine fuel temperature sensor is a thermistor and changes resistance based on the temperature being measured. The ECM provides a 5 VDC reference voltage to the sensor. The ECM monitors the change in signal voltage and converts this to a temperature value. Component location: The engine fuel temperature sensor is located on the lower rear of the integrated fuel system module (IFSM).
According to the shop talk notes, possible causes include:
- Signal shorted to ground in the harness.
- Signal shorted to return or ground in the sensor.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) |
| System / Group | Engine Fuel Temperature Sensor 1 Circuit — ISM CM871 fault codes |
| Fault code | 265 (SPN 174, FMI 4/4) |
| Source | TruckFaultCodes.com Cummins fault code reference (© 2017) |
| Pages | 5 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault code identification (PID, SPN, FMI, lamp)
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models and engines
This document applies to Cummins ISM CM871 (2007-09); Cummins ISX CM871 (2007-09) equipped diesel engines that log Fault Code 265. Always confirm engine calibration and use a Cummins diagnostic tool such as INSITE to read live data before starting repairs. Full specifications are published on the Cummins official website.
Who needs this Cummins fault code 265 manual
Heavy-duty truck technicians, fleet workshops and owner-operators diagnosing an electronic control module warning on ISM CM871 engines will use this sheet to verify the fault before parts are replaced.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download.
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