Cummins Run-Then-Stop – Safety Interlock or Sensor Issue

Generator starts then stops after a few seconds with no specific code

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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

Faulty oil pressure switch not recognizing pressure, Defective coolant temperature sensor, Incorrect controller configuration for sensing, Loose safety circuit wiring

How to Fix / Troubleshooting

Safety first: Disable automatic start. Avoid repeated short start attempts that can drain the battery and flood the engine.

  • Check controller history: Review event logs for any brief fault messages that clear quickly.
  • Oil pressure switch: Verify wiring to the oil pressure switch/sensor. If the engine has good mechanical oil pressure but the controller does not see it, the switch may be faulty.
  • Coolant temp sensor: Inspect the sensor and harness for shorts that could falsely indicate overtemperature.
  • Safety loop continuity: Using the wiring diagram, check continuity of the safety shutdown loop (oil, temp, level switches). Repair any open circuits.
  • Test run: After repairs, perform a manual run and observe sensor readings on the controller.
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Repair Difficulty

Hard 4/5

Required Part

Oil Pressure Switch
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