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Toyota engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.

NHTSA campaign 21V-734 · Reported September 22, 2021 · 8,411 vehicles affected

AFFECTED MODELS
Toyota Prius
VEHICLES AFFECTED
8,411
REMEDY
Dealers will update the ECU software, free of charge.
COST
Free

The short version

Toyota Motor Engineering & Manufacturing reported a problem with the engine control module (ecu/ecm) software. Here is what owners need to know.

WHAT

The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.

WHY IT MATTERS

A loss of drive power increases the risk of a crash.

WHAT TO DO

Take it to a dealer — they will update the ECU software, free of charge.

Affected vehicles

These model years are included in NHTSA campaign 21V-734.

YEAR RANGEMODEL
2022Toyota Prius

What changed

Newest first. The record shows both when the recall began and what has changed since.

  1. Recall reported to NHTSA. LATEST

Drive one of these? Check your VIN to see if your specific vehicle is affected.

Check your VIN

What this record means

Data from the NHTSA recall database. A clean VIN check means no open federal recalls for that vehicle — not that it never had one.

Not affiliated

MyAutoRecalls is not affiliated with Toyota Motor Engineering & Manufacturing or the National Highway Traffic Safety Administration.