This Cummins fault code 261 document is a 3-page troubleshooting PDF for VP44 pump high fuel temperature and overheat fault diagnosis. It identifies PID P0168, SPN 174, FMI 0, and explains that the fuel temperature sensor is located inside the VP44 fuel pump. The procedure focuses on confirming whether the fault is active, comparing sensor data with a temperature probe, finding causes of excessive fuel temperature, and clearing inactive codes after repair.
Official Cummins fault code 261 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB CM550, 1990-94 |
| System/Group | DTCs; VP44 fuel pump high fuel temperature error/overheat error |
| Year/Revision | Unknown; document copywrite 2017 as shown in the file |
| Pages | 3 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 261
- PID: P0168
- SPN: 174
- FMI: 0
- VP44 Pump High Fuel Temperature Error/Overheat Error
- VP44 Fuel Pump
- Description
- Component Location
- Troubleshooting Steps
- Step 1A: Turn key switch ON and check to see if the fault code is active at engine start-up
- Step 2A: Verify the sensor accuracy with a thermocouple or similar temperature probe
- Step 3A: Check for the possible causes of high fuel temperature
- Step 4A: Disable the fault code, run the engine, and verify the fault is inactive
- Step 4B: Clear inactive fault codes using the diagnostic tool
Applicable truck models
This file applies to Cummins ISB CM550 engines from the 1990-94 group when diagnosing DTC information related to the VP44 fuel pump. The extract does not list specific truck makes or chassis models, so coverage should be matched by engine control system, fault code, and VP44 pump application rather than by vehicle badge. For brand information, see the official Cummins website.
Who needs this Cummins fault code 261 manual
Workshop technicians, diesel mechanics, and fleet repair staff need this manual when a diagnostic tool reports Fault Code 261, PID P0168, SPN 174, FMI 0 on an ISB CM550 engine. It is useful for checking whether the code is active at start-up, comparing diagnostic tool fuel temperature data with a thermocouple reading, and following the listed repair verification steps.
The troubleshooting flow states that the VP44 controller communicates the high fuel temperature condition to the engine ECM through the controller area network datalink when fuel inlet temperature exceeds the allowable threshold value of 93°C [199°F]. It also lists possible causes such as wrong fuel type or grade, low fuel tank level, high fuel supply or return restriction, incorrect fuel tank installation, incorrect fuel line routing, high ambient air temperature, and an engine coolant overheat condition. The full PDF is available in the DiagTechPro manuals library, free account required to download.
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