ATC 000923.01 – Fan Motor Power Supply Fault. John Deere System Advisory.

ATC 000923.01 (ATC 923.01)

Code: 000923.01

Shortcode: 923.01


The error code, ATC 000923.01, is generated when the power module (HF) PC6 measures less than 3 volts at the supply voltage for one or both fan motor outputs (lead 0752 and/or lead 0762) while fan motors (M07 and M10) are switched on. This low voltage condition indicates a problem with the power supply to the fan motors, which could stem from issues such as a poor connection, a faulty power module, or an insufficient power source.


The inadequate voltage supply may prevent the fan motors from operating correctly, leading to inadequate cooling of the engine and other critical systems. This can result in overheating, reduced efficiency, and potential damage to the equipment.


  • Inspect Connections and Wiring: Check all connections and wiring to the fan motors, especially at leads 0752 and 0762, for signs of corrosion, looseness, or damage.
  • Measure and Verify Voltage Levels: Use a multimeter to measure the voltage levels at the specified leads while the fan motors are active. Confirm whether the voltage drops below the required level.
  • Evaluate Power Module Functionality: Assess the condition and functionality of the power module (HF) PC6 to ensure it is capable of delivering adequate voltage to the fan motors.
  • Address Power Source Issues: If the power source itself is insufficient or unstable, take measures to correct this, which may involve system adjustments or replacements.
  • Test System After Repairs: Once any faulty components are repaired or replaced and connections are secured, test the system to ensure the fan motors receive proper voltage and operate effectively.


Maintaining proper voltage supply to critical components such as fan motors is essential for optimal machinery performance and longevity. Regular checks and maintenance of electrical systems help prevent failures that can lead to overheating and other related problems, thereby ensuring continuous and reliable operation of the equipment.