Vehicle recall 21V734000 · September 22, 2021
Toyota Prius and Prius Prime
The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.
Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.
- 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.
- 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.
- 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.
Recall details
- NHTSA campaign
- 21V734000
- Reported to NHTSA
- September 22, 2021
- Filed by
- Toyota Motor Engineering & Manufacturing
- Manufacturer campaign
- 21TB07 / 21TA07
- Owner notification
- November 18, 2021
- Vehicles potentially affected
- 8,411
- Initiated by
- the manufacturer
- Components
- Engine and engine cooling › Engine › Engine control module (ECU/ECM) › Software; Hybrid propulsion system
Vehicles covered
As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.
- Toyota Prius (2022): 2022
- Toyota Prius Prime (2022): 2022
Has your Toyota been repaired?
Recalls here come from NHTSA’s records for the model and year. Not every vehicle of a model is included in every recall, and this site can’t see whether a repair has been done. Only a VIN lookup can tell you that.
NHTSA’s VIN search doesn’t show recalls that were already repaired, recalls more than 15 years old, or some small manufacturers’ recalls. Recall repairs are free.