ECU 001639.18 – Proportional Solenoid Valve for Charge Air Cooler, Speed Low. John Deere System Advisory.

ECU 001639.18 (ECU 1639.18)

Code: 001639.18

Shortcode: 1639.18


This error code, ECU 001639.18, is set when the ECU detects that the rotational speed of the proportional solenoid valve for the charge air cooler is lower than expected, possibly due to a malfunction or obstruction in the valve.


The function of the proportional solenoid valve may be limited or disabled to prevent potential issues from inadequate speed control.


  • Inspect Solenoid Valve and Sensor: Check the proportional solenoid valve and its speed sensor for obstructions, damage, or signs of wear.
  • Verify Wiring and Electrical Connections: Ensure that all connections to the solenoid and sensor are secure and free from corrosion.
  • Test and Calibrate the Solenoid Valve: Use diagnostic tools to test the solenoid’s operation and calibrate it to correct the speed output.
  • Replace Faulty Components: If testing reveals that the solenoid or sensor is faulty, replace them to restore proper function.
  • Reset ECU and Conduct Performance Tests: Reset the ECU to clear the error code and perform tests to ensure the solenoid operates within the correct speed range.


Proper functioning of the proportional solenoid valve is vital for maintaining the efficiency of the charge air cooling system. Regular maintenance and prompt attention to faults are key to ensuring reliable operation.

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