Use cautionVehicle recall · NHTSA · Published September 22, 2021
Toyota 2022 Prius: Engine Software Issue May Cause Loss of Drive Power
Toyota is recalling 2022 Prius vehicles with faulty engine software that may cause loss of drive power, increasing crash risk. Owners must update ECU software free of charge.
“Toyota 2022 Prius: Engine Software Issue May Cause Loss of Drive Power.” GovInfoNow, updated August 18, 2026. https://govinfonow.com/recall/81135-toyota-2022-prius-engine-software-issue-may-cause-loss-of. Based on NHTSA recall #21V734000 (https://www.nhtsa.gov/recalls?nhtsaId=21V734000).
Toyota Motor Engineering & Manufacturing recalled certain 2022 Prius and Prius Prime vehicles due to a potential loss of drive power, according to the National Highway Traffic Safety Administration (NHTSA). The recall was announced on September 22, 2021. Dealers will update the ECU software free of charge.
How to tell if you have it
Toyota Prius, 2022
Toyota Prius Prime, 2022
What to do
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.
The hazard
The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power. A loss of drive power increases the risk of a crash.
Context
GovInfoNow's records show Toyota Motor Engineering & Manufacturing has 213 other recalls on record since 2011-01-06. Other recent recalls of similar products include 2024-2027 Toyota Land Cruiser Hybrid Fuel Leak Recall (2026-10-14) and 2026 Toyota RAV4 Plug-In Hybrid Recall: Powertrain Shutdown Risk (2026-10-07).
How to tell if you have this one
Check if your 2022 Prius has a recall notice mailed in November 2021. The recall number is 21TB07/21TA07.
Brand
Toyota
Category
Vehicle
Based on the official NHTSA remedy
What to do — step by step
Update ECU Software
Toyota dealers will provide a free software update to fix the engine control unit issue.
Contact Toyota Customer Service
Call 1-800-331-4331 to confirm your vehicle is affected and schedule the software update.
Official remedy
What NHTSA says to do
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.
How this recall unfolded
Recall timeline
Owners were mailed letters 57 days after NHTSA received the defect report.
1NHTSA received the defect report
2Owner letters mailed
Dates from the agency record only; steps without a date are left out.
Take action
Contact Toyota
We’ve drafted a message you can send Toyota to request your refund or repair — edit it as you like.
Subject: Recall 21V734000 — Toyota 2022 Prius: Engine Software Issue May Cause Loss of Drive Power
Hello,
I own a Toyota 2022 Prius: Engine Software Issue May Cause Loss of Drive Power that is covered by recall 21V734000 from Toyota.
The official recall notice states: 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.
I’m writing to arrange the remedy described in the recall (a refund, repair, or replacement as applicable). Could you please tell me the next steps to resolve this?
Thank you.
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
Plain-language summary written by qwen3:4b on August 18, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.