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
01 —By component

Complaints by component

One complaint can cite several components
  1. Electrical system4
  2. Service brakes2
  3. Fuel/propulsion system2
  4. Power train2
  5. Back over prevention1
  6. Forward collision avoidance1
  7. Service brakes, hydraulic1
  8. Vehicle speed control1
  9. Air bags1
  10. Engine1
  11. Visibility/wiper1
  12. 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
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20211
20222
20231
20242
20253
20261

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.

03 —Owner reports

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.”
Owner complaint to NHTSAFiled Mar 9, 2026Electrical systemODI 11723068

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…”
Owner complaint to NHTSAFiled Oct 29, 2025Electrical system, Service brakes, Fuel/propulsion systemCrash reportedODI 11696251

Fuel/propulsion system

2 reports1 crash
“Rodents accessed and damaged the car because there essentials components are not protected.”
Owner complaint to NHTSAFiled Mar 30, 2025Power train, Electrical system, Fuel/propulsion systemODI 11651621

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.”
Owner complaint to NHTSAFiled Sep 20, 2023Power train, Electrical systemODI 11545583

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.”
Owner complaint to NHTSAFiled Sep 22, 2025Back over preventionODI 11688961

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.”
Owner complaint to NHTSAFiled Oct 20, 2024Forward collision avoidanceCrash reportedODI 11620914
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.