Fault Code 4150
Cummins
Engine Speed Signal Loss
Controller displays Fault Code 4150 – Loss of Engine Speed Signal; generator shuts down
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed magnetic pickup speed sensor, Excessive gap between sensor and flywheel, Damaged speed sensor wiring, Controller input fault
How to Fix / Troubleshooting
Safety first: Disable automatic start and ensure the engine cannot crank while you are near the flywheel housing.
- Locate speed sensor: Find the magnetic pickup sensor at the flywheel housing. Remove and inspect the tip for metal shavings; clean gently.
- Check gap: If adjustable, set the sensor gap to the specification in the Cummins manual (typically around 0.5–1.0 mm). Do not allow contact with the flywheel teeth.
- Wiring: Inspect the harness from the sensor to the controller for cuts, abrasions, or loose connectors. Repair as needed.
- Replace sensor: If the sensor shows physical damage or no signal is detected during cranking, replace it with the correct Cummins speed sensor.
- Reset: Clear the fault and test start the generator, confirming stable speed indication.
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Repair Difficulty
Medium
3/5
Required Part
Engine Speed Sensor
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