BCU 002386.00 – E27 Beacon Light, Current Overload Protection Active. John Deere System Advisory.

BCU 002386.00 (BCU 2386.00)

Code: 002386.00

Shortcode: 2386.00


Error code BCU 002386.00 is triggered when the Power Module (High Frequency) PC6 in a John Deere vehicle measures a total amperage exceeding 40 amps at outputs A1, C1, and D1, which affects multiple functions including the E27 beacon light. This excessive current typically indicates a short to ground or a defective component within the circuits connected to these outputs. The overload condition prompts the system to activate current overload protection to prevent damage to the electrical system and associated components.


Upon detecting this overload, the system activates protection measures which may disable the affected outputs including the beacon light, compressor clutch, and specific worklights on the cab frame to mitigate the risk of overheating, potential electrical fires, or further damage to the power module.


  • Inspect Wiring and Connections: Examine the wiring associated with the E27 beacon light, compressor clutch (M02), and worklights (E20/R, E20/L, E36R, E36L) for any signs of damage, wear, or corrosion that could lead to a short to ground.
  • Measure Current Draw: Use a multimeter or a clamp meter to measure the current draw at the specified outputs 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 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 all affected functions operate 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 disabled functions. 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 all affected functions 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 and other electrical components, maintaining operational efficiency and preventing potential hazards.