2022 Toyota Prius · Transmission & drivetrain
Hybrid propulsion system may lose power
The Engine Control Unit (ECU) software may falsely detect an error and shut down the hybrid system, causing a loss of drive power.
What the reviewed source says
Start with the documented condition, not a parts guess.
NHTSA campaign 21V734000 includes certain 2022 Toyota Prius vehicles. 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. A loss of drive power increases the risk of a crash.
Words owners may use
Does this match the moment?
Symptoms in the pattern
- A hybrid-system warning, reduced propulsion or a no-start condition may occur
- An open campaign appears when the complete VIN is checked
- Some recalled vehicles may show no advance warning before the component fails
Vehicles and scope
- 2022 Toyota Prius
- NHTSA campaign 21V734000
- The manufacturer filing lists 8,411 potentially affected units across the complete campaign.
- VIN eligibility determines whether this recall applies to an individual vehicle
Manufacturer position
What the official procedure directs
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.
Safety recall eligibility is based on the VIN and campaign scope, not ordinary warranty mileage. Check the complete VIN even when the vehicle is outside its original warranty.
Original evidence
Open the documents behind this page.
Repair paths and safe checks
Separate the diagnosis from the action.
Use the official recall 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.
Do not buy parts from the campaign description alone. VIN scope, superseded remedies and parts availability can change.
What owners reported
Did this repair fix the same symptom on your car?
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Check the complete VIN before arranging work
Enter the 17-character VIN in NHTSA's recall lookup and ask the manufacturer or an authorised dealer to confirm whether the campaign is open for this vehicle.
A year, make and model match does not prove that every vehicle is included. The VIN result controls eligibility.
What owners reported
Did this repair fix the same symptom on your car?
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Useful before authorizing work
Read the method beside the problem
These guides explain the safety and evidence checks that apply to this problem file.
Check recalls by VIN
A VIN search checks the displayed NHTSA records for an unrepaired safety recall associated with one vehicle. A model search shows only the wider campaign population.
Read guide ↗When a car is unsafe
A warning light does not always mean the same thing, but weak brakes or smoke leave little room for experimentation. Damaged tires and certain recall instructions can do the same.
Read guide ↗Car shudders or vibrates
A useful diagnosis starts with when the vibration happens and where you feel it. The word shudder alone does not identify a transmission fault.
Read guide ↗More for this model
Other reviewed Toyota Prius conditions
2019 Toyota Prius · Brakes
Braking performance may be reduced
The brake booster pump may fail causing a deactivation of the Vehicle Stability Control system and a loss of braking assist.
2023 to 2026 Toyota Prius · Electrical & software
Electrical or software fault may disable vehicle functions
Water may enter the rear door switch and cause a short circuit, allowing an unlocked rear door to open unexpectedly.
2016 to 2018 Toyota Prius · Electrical & software
Electrical or software fault may disable vehicle functions
A portion of the engine wire harness connected to the hybrid Power Control Unit (PCU), could contact the cover at this connection and wear, causing an electrical short circuit.