BCU 002386.04 – E27 Beacon Light On, Current Too High at Power Module PC6. John Deere System Advisory.

BCU 002386.04 (BCU 2386.04)

Code: 002386.04

Shortcode: 2386.04


Error code BCU 002386.04 is activated when the Power Module (High Frequency) PC6 in a John Deere vehicle detects a current exceeding 15 amps on lead 1004 for the E27 beacon light while it is switched on. This high current typically indicates a short to ground within the circuit, posing a risk of overheating, potential damage to electrical components, or even a fire hazard.


Upon detecting this excessive current, the system activates overload protection, which may disable the affected beacon light to prevent damage and ensure safety. This protective action helps mitigate the risk of electrical fires or component failures.


  • Inspect Beacon Light and Wiring: Examine the beacon light and its wiring for any signs of damage, wear, or corrosion. Focus on identifying potential causes of a short to ground, such as exposed wires or connections that could be contacting metal parts of the vehicle.
  • Measure Current Draw: Use a multimeter or a clamp meter to measure the current draw of the beacon light to verify if it indeed exceeds the normal operational range.
  • Identify and Repair Short to Ground: Locate any shorts to ground found during the inspection. This may involve tracing the wiring from the beacon light back to the power module, checking for any pinch points, worn insulation, or improper routing.
  • Replace Damaged Wiring or Components: Any damaged wiring, connectors, or components found during the inspection should be replaced to restore the integrity of the electrical system.
  • Test After Repairs: After repairs are made, test the circuit again to ensure the current draw is within acceptable limits and that the beacon light functions properly without triggering the high current condition.
  • Reset the Power Module and Clear Diagnostic Codes: Reset the power module PC6 to clear the diagnostic trouble codes and reactivate the beacon light. Ensure that the system is functioning correctly and that no further fault codes are displayed.
  • Monitor System Operation: Keep an eye on the operation of the beacon light to ensure there are no recurrences of the issue and that repairs have effectively resolved the problem.


Electrical safety in vehicle systems is paramount, particularly in circuits where high current can indicate serious faults. Regular maintenance checks, including inspections of electrical wiring and connections, are crucial to prevent issues such as shorts to ground. Addressing such problems promptly ensures the safety and functionality of the vehicle’s lighting systems, maintaining operational efficiency and preventing potential hazards.