2015 Toyota PRIUS PLUG-IN HYBRID - Ratings, Complaints and Recalls

"my brake booster is failing and has been confirmed with certified toyota master mechanics at toyota dealerships that it is failing. toyota has a csp called zjb to replace these once the brake booster fails. my car has been identified as one of the cars with a faulty brake booster and i’m terrified to continue to drive it as it has to throw a code and break before they will change the faulty part. i want them to fix it before it fails and someone gets hurt. what do i do? there are a lot of other complaints about this but toyota is not fixing them until they break. this is a huge safety issue."

"1. brake accumulator pump is running too often, indicating that there is a pressure leak in the braking system. 2. as designed the pump will run only on occasion to charge the booster fully. this pump runs a lot, whether the car is running, or not, whether the brakes are applied, or not, and regardless of braking rigorously or gently. 3. occasionally, on start up, brake pedal goes to the floor as the accumulator has lost all charge. 3. no brake warning lights on dash, yet. 4. no service codes known, yet. toyota had a customer support program to address this issue, extending warranty to 10 years or 150,000 miles. i am at 160,000, 8 years. the problem has been occurring for a while, but i was not aware as it was my wife's car and driven solely by her. i was told today by a toyota resolution specialist that no help would be forthcoming, and to hope that nhtsa issues a recall wherein my problem with the braking system would then be addressed. this seems problematic for many reasons, not the least of which is that it is regarding brakes, an integral part of the safety equipment to ensure our highways are without danger or have no known issues that have not been resolved by a car manufacturer. my toyota case number is 230426001055. this 'complaint' is to alert this agency that there is a problem with my vehicle, and others, known by toyota, as evidenced by past customer support program, and as substantiated today by service rep at family toyota of burleson, and there is no recompense available for the $3,000.00 repair required to ensure my vehicle safely travels our nations highways. while i understand that a car cannot be warrantied indefinitely, an eight year old car that has been meticulously maintained with a serious safety time bomb should not fall upon the owner entirely, nor should it be the responsibility of your agency to force the hand of the automaker. since that is there stance, i appeal to you to respond seriously and help me try to remedy."

"i bought this car brand new and have had it serviced regularly at a greensboro nc toyota dealership. it has 127,000 miles on it. i starting hearing a grinding whirring noice a lot lately and determined it is a brake actuator/brake booster. took it to the dealership and they confirmed it to be a brake booster going bad. engages at least 4 times a minute. there is a customer support program for this repair from toyota zjb and covers the part up to 10 years or 150,000 miles. i am in the covered period but it has to break first before they will cover it even though they confirmed it is going bad. it has to “throw a code” before toyota will pay. i reached out totoyota and they reached out to the dealership which is greensboro toyota in greensboro, nc and their regional office won’t fix it because it would come out of their pocket and toyota won’t fix until it breaks. my research confirms this could be a bad safety issue driving around waiting for this to break. there are no codes yet but the dealership has heard it and confirmed it’s going bad and i have video of the part going bad. i always service everything with my car or home when it needs to be done and to be told to drive around until it breaks is negligent. apparently it is a 2-3k fix. this is a serious safety issue that toyota is aware of. retha fisher 16 fawnwood ct greensboro, nc 27407 336-314-2000"

"the brake assist. driving and suddenly no brakes. happened 2x in this vehicle and had to get a tow each time, even after getting new brake pads the first time it happened at my mechanics. the dealer confirmed today that they would fix the problem at $2700. the lights for traction and abs went off with a warning sound. pulled over both times and called aaa for tow…..each a separate incident."

"the brake booster pump assembly has failed through no fault of my own. this is a major safety issue!"

"the contact owns a 2015 toyota prius. the contact stated that as he approached a stop light at 25 mph, the brake pedal was depressed and traveled to the floorboard as he attempted to stop the vehicle. the brakes failed to operate without warning as he hit the vehicle in front of him. the air bags did not deploy upon impact. a police report was filed and both the contact and the other driver were able to drive away from the scene. no injuries were reported. prior to this failure, the contact stated that the same failure occurred months prior while traveling at 20 mph in the rain. the contact stated that the brakes failed to operate without warning as he depressed the brake pedal to the floorboard; he hit an unknown object on the road due to the failure. the contact initially thought that the failure was related to slippery roadways; however, after the most recent failure, he related the prior incident with his most recent failure. the dealer nor the manufacturer had yet to be notified of the failure. the vehicle had yet to be serviced or diagnosed. the failure mileage was approximately 80,000."

"my 2015 prius gen 3 has a 118,000 miles since we bought it brand new in 2015. we periodically have it maintained with our own mechanic even after the warranty expired with the dealer. however, we experienced that the lights of brake system, abs and vsc went out the same time. we have it checked but there was no error code. the car is operational but the brake system does not engaged fully when you presses the brake pedal. the vehicle does not stop immediately if you need to immediately stop the vehicle. the problem strongly indicates failure in abs control modules which can costs us a big amount of money ranging from $3,500 minimum up to $6000 max. majority of the prius owners that shared their experiences to us regarding the same problems are unanimous in their opinion that it is indeed the brake control module. that such defect can only be pointed to the manufacturers' misdeeds."

"brakes failed to slow or stop vehicle at ?20 mph; driving on a side street. no warning lights were active that morning. crash into telephone phone resulted in "totaled" car. there was broken branches on road and some mud; car may have skidded. my wife says the car seemed to speed up before the crash"

"i purchased the vehicle new in 2025 and i have been experiencing brake failure issues every time i attempted to brake over either a pothole, a slick surface like a metal sheet at road construction or wet roads the brake would fail. all the red warning signs would come on in the dashboard and the brakes would make that loud horrible noise. i love my prius, i don't want to get rid of it. i was hoping toyota motors would have a fixed for the braking system by now as this is very unsafe specially inexperienced drivers. my goal is to pass this car to my teenage daughter when she goes to college in 2021, but this may not be possible if toyota doesn't to up with a solution to the problem."

"the brakes on my 2015 prius totally failed and i had to swerve to avoid crashing into the car stopped in front of me. i've been driving for more than 30 years and have never experienced anything like this. it was terrifying. to wit: i was driving about 20 m.p.h. on city streets in long beach, california, in april 2019. as i drove over a bridge, traffic was coming to a stop at a red light 200 yards in front of me. i drove over a narrow metal plate--there are several on the bridge--and hit the brakes, but my car didn't slow. a warning light flashed--a stability control light, i believe, due to the metal plate. i pressed the brakes to the floor as my car rolled downhill on pavement. my car did not slow at all. i looked in the driver side mirror and saw that the lane to my left was clear, so i swerved into it with my foot on the brakes. the car slowly came to a stop well beyond where i should have stopped had my brakes worked properly. the incident was so terrifying that i had to pull over to collect myself. my brakes worked properly after that. a few days later, i took my car to penske toyota in downey, california, where i bought the car, and told a service agent what happened. i asked him to fix the problem. after service technicians inspected the brakes that day, i was told the brakes appeared to be fine and, barring a recall, nothing could be done. i've been driving the car since then, but i've worried that the brakes could fail again. then i saw the jan. 3, 2020 article below. as a result, i've rented a car and have stopped driving my prius. this is a terrifying, life-threatening problem that needs to be addressed now. https://www.dailynews.com/2020/01/03/a-southern-california-toyota-dealer-wants-the-car-giant-to-fix-an-alleged-brake-defect-before-putting-lives-at-stake/ p.s. i'm not sure of the exact date this incident occurred. date below is my best estimate."