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Toyota Prius hybrid system may shut down while driving

NHTSA campaign 21V734000 · Reported 2021-09-22 · Toyota Motor Engineering & Manufacturing

high How serious is it? About this label

This is serious because power can disappear with no warning; the notice does not say to park the car, but get the update as soon as you can.

What's wrong, in plain English

The software in your Prius's engine computer can wrongly think something is broken. If that happens, it shuts down the hybrid system while you are driving, and the car loses power. You could slow down or stop without warning, which is dangerous in traffic or on the highway. There is no broken part to fix: a dealer loads corrected software into the engine computer at no cost to you.

What you should do

1. Look up your VIN at nhtsa.gov/recalls to confirm your car is affected.
2. Call your Toyota dealer or Toyota customer service at 1-800-331-4331 (recall 21TB07/21TA07) to book the software update.
3. Have the update installed — it is free.

Affected vehicles (2)

Who to contact

Toyota — official Toyota recall lookup

Customer service: 1-800-331-4331

Any franchised dealer for the brand can do the repair. Phone numbers are taken from manufacturer sites and recent NHTSA notices; if one has changed, the number in your own recall letter is the one to use.

The bigger picture

Official notice

Component
ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE
Summary
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.
Safety 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.

Verify your specific vehicle by VIN at nhtsa.gov. Recall repairs are free of charge by law.