*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Service brakes
The brake booster assembly failed, as many of these models had before. A bunch of codes went off as I was driving and the brakes did not function properly. Toyota had an extended warranty for this which they discontinued last year and they would extend no good will towards the $4,000 repair
Aug 28, 2026Service brakes
Emergency Brake, Traction and ABS warning came on and stayed on in addition to a five-second interval cycling on of a motor sound under the hood. O'Reilly Auto Parts and then Toyota dealership confirmed the same code that indicated brake booster assembly needs replacing (C1391) **This is a "known issue" but not yet a recall. Toyota did extend the part warranty to 10 years or 150,000 miles - my vehicle has only gone 85,500 and unfortunately is eight months into the 10th year and Toyota is refusing to cover any portion of the repair. I would like to be part of the effort to have this formally declared a recall because I got the quote today to replace the brake booster assembly and it's going…
Oct 5, 2025Service brakes
Brake light + ABS + traction light came on and the brake became harder to control. I was driving in the rain and briefly lost control. Fortunately, no accident.
Jul 5, 2025Service brakes
brake failure during operation due to bad brake booster pump and accumulator.
May 27, 2025Service brakes
Brakes failing while driving in the rain. I was unable to use my brakes in the rain and headlights turned off while driving too. Took it to the dealer and they won't do anything unless lights are on on dashboard to read the code.
Jan 30, 2025Engine
The contact owns a 2015 Toyota Prius V. The contact stated while driving at various speeds, there was an abnormal knocking sound coming from the engine compartment. The check engine warning light was illuminated. Additionally, the contact stated while driving at speeds under 65 MPH, the vehicle intermittently lost motive power. The vehicle was taken to an independent mechanic where it was diagnosed and DTC codes: P0300, P0302, P0303, and P0304 were retrieved. The contact was informed that several undisclosed parts needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 162,000.
Oct 25, 2024 · 162,000 milesService brakes
I started hearing the whirring sound from the brake booster that normally only comes on at startup almost constantly, about every 15 seconds. Along with this, a puffing sound and a pulsing from the brake pedal when stopped with the car on, such as at a traffic light. Also, when coming to a stop there would be a shudder from the brakes. After about a month I was driving when 3 separate warning lights lit up on the dashboard and the next time I braked the pedal felt very different than normal, very mushy, and the car seemed to not stop as well. I consulted a repair shop and they told me itâs a common problem with this model: brake booster/actuator failure resulting in a loss of the ABS…
Mar 13, 2024Fuel/propulsion system
My Prius V has slow acceleration and the RPMs seem to go unusually high on acceleration. This makes it dangerous to pull out from a stop sign, etc. in certain situations that would be fine in another car of the same make and model. And recently it has started to throttle up when taking my foot off the gas and even when pressing on the brake. This happens intermittently and randomly. Fortunately no accidents have occurred yet and I'm trying to get the problems resolved with Toyota, but the dealer says it will be hard for them to diagnose when the problem is not occurring and there are no warning lights. Less than 60,000 miles on it.
Oct 3, 2022
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.