Research checked 2026-10-24. Individual vehicle eligibility must be confirmed with the manufacturer or regulator.
The official action and its boundaries
On 2026-01-28, the responsible Japan record documented campaign Japan filing 5770 involving Prius. Its published coverage is 2022-25 production (Japan production years (not MY)). This is a dated summary of a specific official safety action, not a new mechanical diagnosis or a claim about the whole global nameplate.
The notice qualifies applicability as follows: Selected Japan Prius chassis/build period 2022-11 to 2025-11; note not all VINs within printed ranges included. The Japanese filing commonly uses production periods and chassis-frame numbers rather than U.S. model years. Toyota expressly cautions that a published chassis-number span can include vehicles outside the affected population.
The identified safety concern
The regulator or manufacturer describes this concern: Rear door opening switch circuit water entry may cause partial latch warning or unintended opening. It is an identified possibility within a defined campaign, not a prediction that an owner’s vehicle will fail. The population count, where supplied, means potentially involved vehicles, not that every vehicle in the list actually experienced the hazard or that a specified percentage failed.
A second notice touching the same general vehicle area does not automatically supersede or duplicate the 2024 campaign. Toyota identifies a different described failure pathway in 2026 and a relay-equipped wiring remedy. Both notice numbers should remain independently searchable rather than being merged into a generic “Prius door problem.”
Remedy recorded in the official notice
The source’s documented corrective approach is: Add relay-equipped wiring to both rear-door circuits free of charge. This is the notice/remedy evidence available in the source reviewed on 2026-10-24; it does not establish that work has been completed on any particular vehicle.
Safety campaign documents may be amended, expanded or replaced. Confirm the current instructions and open/closed status with the official brand network using the vehicle identity. Do not carry out unapproved repairs or deliberately recreate the alleged fault to see whether the car qualifies.
What an owner or used-car buyer should do
A seller should provide the frame number and records for both filing numbers when applicable. As Toyota itself explains, production date and purchase date differ, and a displayed frame range may contain nonaffected examples.
Retain the country, campaign ID Japan filing 5770, original notice date and dated repair confirmation in the vehicle history. If you experience hazardous steering, braking, sudden propulsion loss, smoke, fire or loss of visibility, follow the vehicle maker’s emergency instructions and obtain professional assistance. Related entry: Potential shared concern with Japan filing 5474; no asserted supersession.