BCU 002392.31 – H67 Backup Alarm Malfunction. John Deere System Advisory.

BCU 002392.31 (BCU 2392.31)

Code: 002392.31

Shortcode: 2392.31


Error code BCU 002392.31 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects a malfunction in the circuit of the backup alarm (lead 2077) after the reverse drive lever has been moved to the reverse position. This diagnostic trouble code indicates that the circuit is open, which could be due to a disconnection, break in the wiring, or a fault in the alarm device itself, preventing the backup alarm from functioning as intended.


The system may fail to activate the backup alarm when the vehicle is put in reverse, posing a safety risk by not alerting nearby personnel or vehicles of the machine’s movements.


  • Inspect Backup Alarm and Wiring: Check the backup alarm and its associated wiring for any signs of disconnection, damage, or wear that could result in an open circuit.
  • Test Alarm Functionality: Use a multimeter to test the continuity and voltage at lead 2077 to confirm the presence of an open circuit.
  • Check Connections: Ensure that all connectors, including those at the backup alarm and control unit, are secure and free from corrosion or damage.
  • Repair or Replace Faulty Components: If a break or disconnection is identified, repair the wiring or replace the faulty components to restore proper function to the backup alarm.
  • Reset the BCU and Clear Diagnostic Codes: After repairs are made, reset the BCU to clear any diagnostic trouble codes and retest the system to ensure the backup alarm operates correctly without further issues.
  • Monitor System Operation: Continuously monitor the functionality of the backup alarm after repair to ensure no further issues of circuit failure arise and that the alarm activates correctly in reverse gear.


Regular checks and maintenance of safety features like backup alarms are critical to ensure they function efficiently and reliably. Addressing issues promptly can prevent accidents and ensure ongoing safety for both the operator and surrounding personnel. Maintaining the integrity of electrical connections and ensuring that circuits are not open or shorted is vital for the safe operation of heavy machinery.