ECU 000094.04 – Low-Pressure Fuel Signal Out of Range Low. John Deere Engine Control.

ECU 000094.04 (ECU 94.04)

Code: 000094.04

Shortcode: 94.04


The ECU 000094.04 (94.04) error code on John Deere equipment signals that the low-pressure fuel system signal is lower than expected, typically indicative of a short to ground. This condition could be caused by issues such as a grounding fault in the wiring, a damaged sensor, or faulty electrical connections. A low signal may result in incorrect fuel pressure readings, which can affect the engine’s fuel management system and lead to reduced engine performance or operational inefficiency.


In response to this fault, the engine control system might reduce the engine’s power output or initiate a fail-safe mode to prevent damage due to incorrect fuel delivery settings.


  • Inspect Fuel Sensor and Wiring: Carefully check the low-pressure fuel sensor and its associated wiring for any signs of wear, damage, or grounding issues.
  • Diagnose Electrical Connections: Ensure all electrical connections are secure and free from corrosion or loose contacts that could contribute to grounding faults.
  • Replace Faulty Components: If the sensor or wiring is found to be defective, replace these components with original John Deere parts to restore normal operation.
  • System Reset and Operational Testing: After completing repairs, reset the engine control unit to clear the error and perform a comprehensive test of the fuel system to ensure all components function correctly.


It’s crucial to regularly monitor and maintain the electrical integrity of the fuel system components on John Deere machinery. Preventive maintenance and routine checks can identify potential issues before they lead to significant problems, ensuring reliable and efficient operation. Additionally, maintaining clean and dry electrical connections is essential to prevent shorts and other electrical issues.

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