ECU 000647.05 – Proportional Solenoid Valve Current Too Low (Charge Air Cooler Hydraulic Motor). John Deere System Advisory.

ECU 000647.05 (ECU 647.05)

Code: 000647.05

Shortcode: 647.05


This error code, ECU 000647.05, is generated when the ECU detects that the current at the proportional solenoid valve for the charge air cooler hydraulic motor is too low, indicating an open circuit. This affects the fan speed increase circuit.


The ECU may limit or disable the park lock function to prevent damage or malfunction due to the faulty circuit.


  • Inspect Solenoid Valve Wiring: Check the wiring and connectors for the proportional solenoid valve for any signs of damage, corrosion, or disconnection that could cause an open circuit.
  • Measure Circuit Current: Use diagnostic tools to measure the current in the circuit and identify any points of failure.
  • Repair or Replace Faulty Wiring: Fix any identified issues by repairing or replacing damaged wires or connectors.
  • Verify Solenoid Valve Functionality: Ensure the solenoid valve operates correctly after repairs to confirm that the current is within the specified range.
  • Reset ECU and Test System: After addressing the issue, reset the ECU and perform system tests to ensure the solenoid valve functions correctly and no further errors are detected.


Maintaining the integrity of the solenoid valve wiring and ensuring correct current flow is essential for proper operation of the charge air cooler hydraulic motor.

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