ECU 001639.01 – Proportional Solenoid Valve for Charge Air Cooler, Speed Not Available. John Deere System Advisory.

ECU 001639.01 (ECU 1639.01)

Code: 001639.01

Shortcode: 1639.01


Error code ECU 001639.01 is triggered when the ECU does not detect any rotational speed signal from the proportional solenoid valve for the charge air cooler. This issue may result from a malfunction in the sensor or related wiring.


The function of the proportional solenoid valve may be limited or disabled, potentially affecting the performance of the charge air cooler.


  • Inspect Solenoid Valve and Sensor: Check the proportional solenoid valve and its speed sensor for signs of damage or malfunction.
  • Verify Wiring and Connections: Examine the wiring and connectors associated with the solenoid valve and speed sensor for any signs of damage, corrosion, or loose connections.
  • Test Sensor and Solenoid Operation: Use diagnostic tools to test the solenoid operation and the accuracy of the speed sensor.
  • Replace Faulty Sensor or Solenoid: If either the sensor or solenoid is found to be defective, replace it to ensure proper operation.
  • Reset ECU and Verify Operation: After making the necessary repairs, reset the ECU to clear the error code and test the system to confirm that the proportional solenoid valve operates correctly and the speed signal is detected.


Ensuring the proper function of the proportional solenoid valve is crucial for maintaining optimal performance of the charge air cooling system. Regular inspections and timely repairs can help maintain system integrity.

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