ATC 000923.12 – Fan Motor Off, Current Present. John Deere System Advisory.

ATC 000923.12 (ATC 923.12)

Code: 000923.12

Shortcode: 923.12


The error code, ATC 000923.12, is triggered when the power module (HF) PC6 detects current in excess of 1 amp at one or both fan motor outputs (lead 2043 and/or lead 2047) while the fan motors (M07 and M10) are switched off. This condition typically indicates a short in the circuit or an internal fault within the power module itself. It is important to note that this diagnostic trouble code may appear in conjunction with ATC 000923.01, which relates to a problem with the voltage supply for the fan motor outputs; ATC 000923.01 should be addressed first.


The presence of current when the fan motors are off can lead to unintended operation or damage to the fan motors due to overheating, potentially affecting the cooling efficiency and leading to higher risks of overheating other components.


  • Address ATC 000923.01 First: Ensure that the voltage supply issues indicated by ATC 000923.01 are resolved before addressing the current issue.
  • Inspect Wiring and Circuitry: Examine the wiring and circuitry associated with leads 2043 and 2047 for any signs of damage, wear, or shorts to ground.
  • Measure Current Flow: Use a clamp meter to measure the current flow through the affected leads when the fan motors are supposed to be off. Verify if the current exceeds the normal range.
  • Check Power Module: Assess the power module (HF) PC6 for any internal faults or damage that could be causing the unwanted current.
  • Replace or Repair Faulty Components: If any specific components, wiring, or the power module itself are found to be faulty, replace or repair them to restore proper operation and safety.
  • Test System After Repairs: Once repairs are made, test the system to ensure that no current is present when the fan motors are off and that the system functions correctly under normal operational conditions.


Regular maintenance and monitoring of the electrical systems controlling fan motors are crucial to prevent issues like unintended current flow. Addressing electrical faults promptly helps maintain the reliability and performance of cooling systems, which are vital for preventing overheating and ensuring the longevity of machinery components.