Updating Toyota Prius

Jan. 30, 2024
This bulletin applies to some 2016-2019 Toyota Prius vehicles with a NiMH HV battery.

Some 2016-2019 Toyota Prius vehicles equipped with a NiMH HV battery may exhibit one or both of the following conditions after repeated driving on long downhill slopes or while driving in high ambient temperatures, then turned off for about one or 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 (SOC) is at its lowest level.

The Hybrid Control Computer (HV ECU) logic has been modified to reduce the possibility of these conditions. Reprogram using software version 14.20.019 or later.

This bulletin applies to vehicles produced before the production change effective VINs shown below:

2016-2018.........Prius.............Tsutsumi...................JTDKBRFU#J3083928

2019..................Prius.............Tsutsumi....................JTDL9RFU#3013264

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