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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Can Communication System (HEV) - Circuit Tests (1 Of 3) & Diagnostic Codes) >> CAN COMMUNICATION SYSTEM (for HEV Model) >> DTC B1020-04: Central Gateway ECU System Internal Failure [12/2022 - ] >> Procedure

DTC B1020-04: Central Gateway ECU System Internal Failure [12/2022 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  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 [12/2022 - ] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2022 - ] 

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