ATC 001551.04 – Pressurizer Blower Motor Circuit Voltage Low. John Deere System Advisory.

ATC 001551.04 (ATC 1551.04)

Code: 001551.04

Shortcode: 1551.04


The error code, ATC 001551.04, indicates that the voltage in the A/C pressurizer blower motor circuit is too low. This condition can be caused by issues such as poor wiring connections, a depleted battery, a malfunctioning alternator, or faults within the voltage regulator or power supply system. Low voltage can prevent the blower motor from operating effectively, which may impair the air pressurization and ventilation system within the cabin.


The low voltage condition may cause the pressurizer blower motor to operate inefficiently or not at all, leading to inadequate cabin pressurization and potentially uncomfortable or unsafe conditions inside the cabin.


  • Inspect Electrical Wiring and Connections: Check the wiring and connections within the blower motor circuit for any signs of wear, damage, or loose connections that could be causing voltage drops.
  • Measure Voltage Levels: Use a multimeter to verify the voltage levels at the blower motor and throughout its circuit to identify any significant drops below the required levels.
  • Evaluate Battery and Charging System: Assess the condition of the battery and the performance of the charging system (including the alternator) to ensure they are providing sufficient power to the system.
  • Check Voltage Regulator and Power Supply: Inspect the voltage regulator and any associated power supply components for faults that could result in low voltage output. Replace or repair as necessary.
  • Reset and Test the System: After making necessary repairs and adjustments, reset the system controls, clear any fault codes, and test the blower motor to ensure it operates correctly and efficiently under normal voltage conditions.


Maintaining the electrical integrity of the HVAC system is vital for ensuring the comfort and safety of the vehicle’s occupants. Regular checks and maintenance of electrical components help prevent problems associated with voltage irregularities, ensuring reliable and efficient operation of the pressurizer blower motor and related systems.