ATC 000923.03 – Circulation Blower Motor Circuit High Voltage. John Deere System Advisory.

ATC 000923.03 (ATC 923.03)

Code: 000923.03

Shortcode: 923.03


The error code, ATC 000923.03, indicates that the voltage in the circuit between the circulation blower motor and the blower motor controller is excessively high. This abnormal voltage condition could be caused by issues such as a fault in the blower motor controller, incorrect wiring, or a malfunction within the power supply system, leading to potential risks of overheating and damage to the electrical components.


The high voltage condition could trigger safety protocols that may either limit or shut down the blower motor operation to prevent damage. This can affect cabin comfort, especially in terms of air circulation and temperature regulation.


  • Inspect Wiring and Connectors: Examine the wiring and connectors between the blower motor and its controller for signs of damage, corrosion, or improper connections that might contribute to high voltage.
  • Measure Voltage Levels: Use a multimeter to check the voltage levels in the circuit to verify if they exceed the normal operating range.
  • Check Blower Motor Controller: Evaluate the blower motor controller for any faults or damage that could be causing the voltage irregularity. Replace or repair as necessary.
  • Verify Power Supply Stability: Ensure that the power supply to the blower motor controller is stable and within specified limits to avoid voltage spikes.
  • Reset and Test the System: After addressing the potential issues, reset any fault indicators and test the blower motor operation to ensure the system functions correctly and safely under normal conditions.


Regular maintenance and careful monitoring of the HVAC system’s electrical components are crucial for safe and effective operation. Addressing high voltage issues promptly helps maintain system integrity and prevents further complications, ensuring that the vehicle’s cabin environment remains comfortable and safe for the operator.