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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 107 (Hybrid Control System (2WD) - Diagnostic Codes (4 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P0C30-00: Hybrid/EV Battery State of Charge High [12/2019 - 11/2023] >> Procedure

DTC P0C30-00: Hybrid/EV Battery State of Charge High [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HYBRID CONTROL) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0C30-00 only is output. A
      DTCs except P0C30-00 are output. B
    2. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 09/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]

    Result: 

    A 

    See step  2

  2. CHECK BATTERY VOLTAGE SENSOR (IGCT VOLTAGE) 

    Refer to PROCEDURE - Step 2

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY VOLTAGE SENSOR POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - HV BATTERY JUNCTION BLOCK ASSEMBLY) 

    See step  3

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HYBRID BATTERY THERMISTOR 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  4

  4. CHECK BATTERY VOLTAGE SENSOR (VIB VOLTAGE) 

    See step  4

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK BATTERY VOLTAGE SENSOR (GIB - GND) 

    See step  5

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    OK 

    See step  6

  6. CHECK HYBRID VEHICLE CONTROL ECU (HYBRID BATTERY CURRENT) 
    1. Turn the ignition switch to ON.
      NOTE:

      During the inspection, make sure to only turn the ignition switch to ON. Do not turn the ignition switch to ON (READY).

    2. With the ignition switch to ON, monitor Data List item "Hybrid Battery Current" and "Hybrid Battery Current for Hybrid Battery Control" for 1 minute.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Hybrid Battery Current
      Hybrid Battery Current for Hybrid Battery Control

      Result

      Result  Proceed to
      The value of Data List item "Hybrid Battery Current" and "Hybrid Battery Current for Hybrid Battery Control" is -0.5 A or less or 0.5 A or more. A
      Other than above B
    3. Turn the ignition switch off.

    Result: 

    A 

    REPLACE BATTERY VOLTAGE SENSOR 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

  7. CHECK BATTERY VOLTAGE SENSOR (VIB VOLTAGE) 

    See step  9

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    NG 

    REPLACE BATTERY VOLTAGE SENSOR 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

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