OBDII Code List

P3030 TOYOTA - Disconnection Between Battery And ECU

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
Comments  |  Add Comment

Possible causes

  • Junction block assembly (busbar module)
  • Faulty Battery ECU
  • Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • P3030 Toyota Description

    The battery Electronic Control Unit (ECU) monitors a voltage of the battery blocks to detect an open malfunction in internal battery voltage sensor circuits of the battery ECU and the wire harness between each battery block and battery ECU. If a voltage at one of the battery blocks is below a standard level or of all the battery blocks is within a specified range, the battery ECU judges that there is an open in the internal sensor circuit(s) or wire harness. The battery ECU then illuminates the Malfunction Indicator Lamp (MIL) and sets a Diagnostic Trouble Code (DTC).
    OBDII Code P3030 Toyota - Disconnection Between Battery And ECU -

    Need more help?

    Get the P3030 Toyota code diagnosed by a professional: Find a repair shop in you area

    Related Information

    P3030 TOYOTA Comments

    Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P3030 Toyota code? Have you replaced any parts?
    Any information is appreciated. Thanks
    Top ⇧