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Toyota Prius Recall 21V734: Hybrid System May Shut Down Without Warning, Losing Drive Power

NHTSA campaign 21V734, reported September 22, 2021, 8,411 vehicles potentially affected.

What this recall means for you

The engine control software in these vehicles can falsely detect a fault and shut down the hybrid system while driving. When that happens, the vehicle loses drive power.

Losing drive power raises the risk of a crash, particularly in traffic or at highway speeds. Owners should check whether their vehicle is included in this recall and, if it is, have it repaired as soon as possible. The software update is free at an authorized Toyota dealer. You can also check your VIN for open recalls and contact Toyota customer service at 1-800-331-4331 for more information.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 21V734Toyota Motor Engineering & Manufacturing
Component
ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE; HYBRID PROPULSION SYSTEM
Problem
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2022 Prius and Prius Prime vehicles. The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.
Risk
A loss of drive power increases the risk of a crash.
Remedy
Dealers will update the ECU software, free of charge. Owner notification letters were mailed November 18, 2021. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's number for this recall is 21TB07/21TA07.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

Affected vehicles

Toyota Prius2022
Toyota Prius Prime2022