Problems · NHTSA complaints
2021 Toyota Prius Prime problems
Owners filed 10 complaints about the 2021 Toyota Prius Prime with NHTSA between May 2021 and Mar 2026. The most-cited component is electrical system (4).
Complaints
10
Filed with NHTSA
Crashes
4
Reported by owners
Fires
0
Reported by owners
Injuries
2
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Electrical system4
- Service brakes2
- Fuel/propulsion system2
- Power train2
- Back over prevention1
- Forward collision avoidance1
- Service brakes, hydraulic1
- Vehicle speed control1
- Air bags1
- Engine1
- Visibility/wiper1
- Other / unknown1
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 11, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
1
2
1
2
3
1
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2021 | 1 |
| 2022 | 2 |
| 2023 | 1 |
| 2024 | 2 |
| 2025 | 3 |
| 2026 | 1 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Electrical system
4 reports1 crash
“Odometer Fraud. The contact purchased a 2021 Toyota Prius Prime. The contact discovered that there was a mileage discrepancy after the purchase. The vehicle was a private sale. At the time of the purchase, the vehicle mileage was 73,000. It was later discovered upon checking the vehicle history report with a Local dealer, the contact was informed that the mileage was 274,000.”
Service brakes
2 reports2 crashes
“I was slowly entering a handicapped parking place right in front of a business. The distance from the front of the parking space to the building wall was about 15 feet, one car length. I approached the place to stop in the parking spot when in a split second the car violently surged forward and would have crashed into the cinderblock wall had there not been a supporting post on the building and a metal frame with equipment which stopped the forward movement. The surge was explosive, almost like the acceleration of an airplane taking off. The whole incident took a second or two. There was no opportunity for any driver response to the surge. Had we not been using seatbelts, the front seat passenger & myself would have gone into the windshield and perhaps been killed or very seriously injured. Had I not been driving toward the building when the violent episode occurred, I likely would have hit someone in the parking area and killed or seriously injured people or crashed into park cars. Our injuries were relatively minor due to the seatbelts. The passenger will need therapy on her neck and back. A week later we are still emotionally stressed. There were no…”
Fuel/propulsion system
2 reports1 crash
“Rodents accessed and damaged the car because there essentials components are not protected.”
Power train
2 reports
“The contact owns a 2021 Toyota Prius Prime. The contact stated that after the vehicle was shifted into park, the key was removed and the contact stepped away from the vehicle, when the vehicle inadvertently started to roll away. As a result, the vehicle rolled into the neighbor’s driveway and grazed another vehicle then stopped. Additionally, the contact stated that while the vehicle was on the charger port, the vehicle failed to start. The dealer was notified of the failure and the contact was advised to take the vehicle in to be diagnosed. The vehicle was not diagnosed or repaired. The manufacture was notified of the failure and the contact was provided a case number. The failure mileage was approximately 80,000.”
Back over prevention
1 report
“The contact owns a 2021 Toyota Prius Prime. The contact stated that while shifted into reverse(R), the rearview camera intermittently went black. No warning light was illuminated. In addition, the contact stated that while driving at various speeds, the rearview camera intermittently went black. The local dealer was contacted. The vehicle was not diagnosed or repaired. Upon further investigation, the contact related the failure to an unknown NHTSA Campaign; however, the VIN was not under recall. The manufacturer was made aware of the failure. The failure mileage was approximately 27,696.”
Forward collision avoidance
1 report1 crash
“My vehicle is equipped with Toyota Safety Sense, which includes Full-Speed Range Dynamic Radar Cruise Control (DRCC) and a Pre-Collision System. Today, while driving with DRCC engaged, my vehicle followed a leading car and appropriately slowed down to 2 mph as we approached a signalized intersection. However, when the leading vehicle changed lanes, a gap was created between me and a new lead vehicle, which was fully stopped. Despite this, the DRCC system accelerated to 5mph and collided with the stopped vehicle.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 11, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.