ECU 003597.01 – Fuel Injector High Voltage Supply Extremely Low. John Deere System Advisory.

ECU 003597.01 (ECU 3597.01)

Code: 003597.01

Shortcode: 3597.01


This code indicates that the ECU has detected an extremely low high voltage supply to the fuel injectors, even though the unswitched battery voltage to the ECU is within the correct range. This issue can lead to improper fuel injection and engine performance problems.


The ECU may limit engine power or modify fuel injection strategies to prevent damage and maintain safe operation, potentially leading to reduced engine performance.


  • Inspect High Voltage Supply Circuit: Check the wiring and connections in the high voltage supply circuit to the fuel injectors for any signs of damage, wear, or loose connections.
  • Measure Voltage Supply: Use a multimeter to measure the voltage at the fuel injector supply to ensure it is within the specified range.
  • Test and Replace Components: If a component is found to be faulty, such as the injector driver module or associated wiring, replace it to restore proper voltage supply.
  • Reset ECU and Perform Tests: After repairs, reset the ECU to clear the fault code and perform comprehensive tests to verify that the fuel injectors receive the correct voltage and function properly.


Maintaining the correct voltage supply to fuel injectors is crucial for accurate fuel delivery and optimal engine performance. Regular inspections and timely repairs can prevent voltage-related issues.

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