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Car Safety DB

NHTSA Campaign Number

21V734000

ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

Reported to NHTSA: September 22, 2021

Key Takeaways

  • Recall 21V734000 currently maps to 2 tracked vehicle-year pages across 1 make.
  • This page summarizes the official defect description, safety consequence, and remedy text published by NHTSA for this campaign.
  • This is a campaign-level lookup, not a VIN-level clearance result. Use a VIN lookup before assuming your specific vehicle is still open.

Useful Next Steps

Check a VIN for an open recallRead what to do after a recall noticeBrowse more engine recallsOpen an affected vehicle page

Defect Description

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 Consequence

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.

What This Recall Page Shows

This page summarizes a single NHTSA recall campaign, including the defect description, safety consequence, and manufacturer's remedy. The affected vehicles listed below are the make/model/year combinations tracked in our database — this is not a VIN-specific result. To check whether your individual vehicle is covered by this recall, enter your 17-digit VIN at nhtsa.gov/recalls. Click any vehicle below to view its full safety profile.

VIN recall lookup guideWhat to do after a recallMore engine recalls

Affected Vehicles (2)

YearMakeModel
2022ToyotaPrius
2022ToyotaPrius Prime

Browse Affected Vehicles

Affected Models

Toyota PriusToyota Prius Prime

Affected Make + Year Views

2022 Toyota

Affected Years

2022

Related Engine Campaigns

These campaigns share the same broad recall component family, so they are useful if you want to compare how similar issue types appeared across other vehicles and time periods.

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This recall information is from NHTSA campaign 21V734000. This site is not affiliated with NHTSA. Contact your dealer or call NHTSA's Vehicle Safety Hotline at 1-888-327-4236 for more information.

Data synced from NHTSA on May 4, 2026