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Powering the Toyota Prius Battery

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The Hybrid control computer (HV ECU) logic has been modified to reduce the possibility of these conditions.

| Photo Credit: Toyota

Some 2016-2019 Toyota Prius vehicles equipped with a NiMH HV battery may exhibit one or both the following conditions after repeated driving on long downhill slopes or while driving in high ambient temperatures, then turned off for approximately one to two hours and restarted:

  • When accelerating from a stop or from extremely low speeds, the vehicle may have a reduction of power;
  • The HV battery monitor on the multi-information display continually shows one bar, indicating that the battery state of charge is at its lowest level.

The Hybrid control computer (HV ECU) logic has been modified to reduce the possibility of these conditions. Confirm that the vehicle has a NiMH battery by inspecting the 5th digit or character of the VIN. If the fifth character is a “B” or a “9”, check for an authorized modifications label to see if the HV ECU calibration has been updated. If not already calibrated, flash reprogram the HV ECU with the latest calibration.

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