Error code BCU 523691.01 is triggered when the Power Module (High Frequency) PC6 in a John Deere vehicle measures less than 3 volts at the supply voltage for the lower worklights on the cab frame (E20 or E36), when these lights are activated. This diagnostic trouble code indicates a potential issue with the power supply…

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Error code BCU 523691.00 is activated when the Power Module (High Frequency) PC6 in a John Deere vehicle detects a total amperage exceeding 40 amps at the A1, C1, and D1 outputs, which are associated with several critical functions. This diagnostic trouble code is indicative of a short to ground or a defective component within…

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Error code BCU 523690.02 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects unrealistic values from the switches used for remote control of the rockshaft on the right and left sides. This diagnostic trouble code suggests a potential issue with the switch mechanisms or their electrical connections, which may lead…

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Error code BCU 523689.31 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects an engage signal from the differential lock switch that persists for more than 15 seconds. This diagnostic trouble code suggests a potential issue with the switch itself, such as a stuck button or a fault in the…

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Error code BCU 523652.02 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects an erroneous signal during the initialization phase of the control unit—specifically during the boot sequence after the ignition is turned on. This diagnostic trouble code indicates that the controller is potentially connected to an incorrect wiring harness…

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Error code BCU 523438.02 is issued when the Basic Control Unit (BCU) of a John Deere vehicle detects a fault within its internal module, specifically the Electrically Erasable Programmable Read-Only Memory (EEPROM). This diagnostic trouble code suggests that there may be an issue related to data storage or retrieval processes within the EEPROM, affecting the…

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Error code BCU 522507.31 is generated when the Basic Control Unit (BCU) of a John Deere vehicle has not been calibrated, is incorrectly calibrated, or if the calibration has not been completed. This diagnostic trouble code may also occur erroneously during the calibration of the hitch, indicating a potential issue with the calibration process. The…

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Error code BCU 522451.14 is issued when the Basic Control Unit (BCU) of a John Deere vehicle detects an open circuit in response to an activation command for a function that does not exist within the system’s configuration at address BCU071. This diagnostic trouble code signifies that there is a misconfiguration or error within the…

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Error code BCU 522451.04 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects an open circuit at the moment a nonexistent function is activated in address BCU071. This diagnostic trouble code suggests a miscommunication or programming error within the vehicle’s control system, where a command is issued for a function…

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Error code BCU 522451.03 is triggered when the Basic Control Unit (BCU) of a John Deere vehicle detects an open circuit at the time a nonexistent function is activated in address BCU071. This diagnostic trouble code indicates that there has been an attempt to activate a function that does not exist within the system’s configuration,…

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Error code BCU 303057.04 occurs when the Basic Control Unit (BCU) of a John Deere vehicle measures a voltage below 0.25 V at the signal input of the B27 rate of drop potentiometer during the calibration of the hitch control. This low voltage reading can indicate issues such as poor connections, broken wiring, or a…

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