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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Battery System (PHEV) - Diagnostic Codes (4 Of 4) & Circuit Tests >> HYBRID BATTERY SYSTEM (for PHEV Model) >> DTC P31B4-00: Extreme Hybrid/EV Battery Charging Current [03/2023 - ] >> Procedure

DTC P31B4-00: Extreme Hybrid/EV Battery Charging Current [03/2023 - ]: Procedure

  1. CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) 

    Pre-procedure1

    • None
    • Check for DTCs.

      Powertrain > HV Battery > Trouble Codes 

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      "P31B4-00" only is output. A
      DTCs except "P31B4-00" of hybrid battery system are output. B
      DTCs except "P31B4-00" of hybrid control system are output. C

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    A 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [03/2023 - ]

    Result: 

    B 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer To  DIAGNOSTIC TROUBLE CODE CHART [03/2023 - ] 

    Result: 

    C 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [03/2023 - 01/2025] , or refer to DIAGNOSTIC TROUBLE CODE CHART [01/2025 - ]