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DTC B1020-04: Central Gateway ECU System Internal Failure [11/2023 - ]: Procedure

  1. RECONFIRM DTC OUTPUT 

    Body Electrical > Central Gateway > Trouble Codes 

    Result

    Result Proceed to
    B1020-04 is output A
    B1020-04 is not output B

    Result: 

    A 

    REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU). Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

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