BCU 001893.07 – Front PTO Switch Fault. John Deere System Advisory.

BCU 001893.07 (BCU 1893.07)

Code: 001893.07

Shortcode: 1893.07


Error code BCU 001893.07 is activated when the Basic Control Unit (BCU) of a John Deere vehicle detects a fault in the front Power Take-Off (PTO) switch while the front PTO is activated as configured in address BCU027. This diagnostic trouble code suggests that the switch may be malfunctioning, providing erroneous signals or failing to provide any signal, which can lead to improper operation or non-operation of the front PTO system.


In response to this fault, the BCU may disable the front PTO to prevent unintended or unsafe operations, and a warning may be displayed to alert the operator of the issue.


  • Inspect Front PTO Switch: Examine the front PTO switch for any signs of physical damage, wear, or environmental impact such as moisture or corrosion that could affect its operation.
  • Test Switch Functionality: Use diagnostic tools to check the electrical functionality of the front PTO switch. Ensure it is operating within the manufacturer’s specified parameters and reacts correctly to engagement and disengagement commands.
  • Check Wiring and Connections: Inspect the wiring and connections leading to and from the front PTO switch. Look for loose connections, damaged wires, or signs of corrosion that might interfere with signal transmission.
  • Replace Faulty Switch: If the switch is found to be defective, replace it to ensure reliable operation of the front PTO system.
  • Reset the BCU and Clear Diagnostic Codes: After replacing the switch or repairing the wiring, reset the BCU to clear any stored fault codes. Perform a comprehensive system test to ensure the front PTO operates correctly and that no further fault codes are generated.


Maintaining the functionality of the front PTO switch is critical for the safe and effective operation of PTO-driven implements. Regular checks and timely maintenance of this component and related electrical systems can help prevent operational disruptions and ensure that your John Deere equipment remains productive and efficient. Proper diagnostics and maintenance of the switch are essential for reliable front PTO function, minimizing downtime and maximizing operational efficiency.