2012 TOYOTA PRIUS Complaints

Brake booster pump assembly. Toyota has sent a notice of extended warranty for this vehicle which has expired. Without repair, the brakes will loose compression and stop working.

The brake actuator has failed in this 2012 Prius with 135,000 miles. No issues were noticed while braking, however, when starting the car, the ABS, Brake and Traction Control warning lights lit up. The Toyota Dealership said this is a failed Brake Actuator and quoted $3,800. We have learned there is a secondary warranty on this part due to constant failures that Toyota issued, however, this warranty only applies to Prius up to 150,000 miles or 10 years from initial use, whichever comes first. This is unfair to most Prius users as this is a common problem happening, but typically happening after the 10 year mark.

The ABS, Brake, and Traction Control lights all illuminated while driving. I took it into a local shop, the computer scanned "brake accumulator leak". The accumulator is buzzing every 10 seconds and the brake fluid needs topping up. Now there is a brake fluid puddle under the car. The fix is to repair the brake master cylinder and replace the brake booster pump. The car is a 2012 with 110,000 miles. This is a known Toyota Prius vehicle issue but they decline to service it and can the brakes can fail.

The issue is my brakes failed on me all of a sudden. My abs light, traction control light, and brake light came on out of nowhere. Suddenly didn't have brake pressure. Had to pump the brakes a few times before the car would stop. Luckily I didn't hit anything or anyone. I brought the car to Prius specialist and they diagnosed it saying it was the ABS Actuator Pump Assembly and Master Cylinder. They said it is quite common in the 3rd generation of Prius'. I contacted Toyota North America and they said they had a recall on the parts but it ended Dec 31st, 2021. I bought the car in 2022 unknowingly. Was quoted around $4000 to repair it parts and labor. This is a safety issue that should not be limited to time. Luckily I was not on a Freeway or anywhere where I could have done damage. This issue is a hazard to myself and other people on the road. Toyota needs to resolve this.

Anti lock brake malfunction. Code c1391 leak in brake accumulator. This seems to be a common code for brake issues with Prius. The cost to repair is significant, more than the value of the car. This is a certain safety issue that needs to be addressed. This is clearly a Hazzard and will cost lives to those who cannot afford the cost of repair.

Without warning, the ABS, Traction Stability, Brake and other lights lit up and I lost braking on the highway. Luckily, I was in very light and narrowly avoided a crash. I was able to get home with far less braking power and no regenerative braking. Since then, I have researched the problem and found that this is an extremely common issue. I can remedy it for ten or twenty minutes by putting the car in DIAG mode and pumping the brakes, but it will do it again, and again. I need a new accumulator and ABS module, and the dealer wants thousands for it. I cannot afford it and it is a known flaw and a safety issue. I take my daughter to school in this car, thankfully it's nearby, but it's terrifying. Our other Prius has no issues, and I understand that Toyota has repaired other cars under a warranty program of which I was never notified.

2012 Prius in very good condition with 180k miles- only 12 years old. Driving on back roads (thankfully) and the drivers side rear wheel compelely fell off while driving. I was doing about 30 MPH and felt like there was a flat tire so I was in the process of pulling over when the whole rear assembly snapped. The wheel hit the rear quarter of the car and bounced about 100 feet down the road. I could have been on the highway and this could have been fatal I believe. Very, Very scary. As can be seen in attached photos the issue was rust from the inside. This is very concerning since there was no way for me to know this was an issue. I could have been killed or killed someone else. I believe Toyota needs to look into this since there are other Prius' out there the same thing happened to on this very thread. Although this is a Massachusetts car I have owed it since 25k miles and have maintained it impeccably. I always have the undercarriage cleaned after driving on salty roads. Safety inspection was current- only done the month before. Had that wheel bearing replaced about 2 weeks before the incident and the reputable mechanic reported no issues. There was no warning except for maybe a minute before it happened- the car was vibrating like I had a flat tire. The damage repair estimate on this was $8500. Catastrophic fail Toyota. Is this a rust issue like the Tacoma, Tundra, and Sequoia?????

2012 Toyota Prius 5 with 105k miles. ABS, Brake, and Traction Control lights all illuminated while driving to work. Drove to the dealership and had their service department run a diagnosis for 200$. Their scanner reported CODE C1391, and that a new BRAKE PUMP and MASTER CYLINDER ASSEMBLY would need to be replaced for a total cost of $4,000. Toyota has a Customer Support Program Bulletin indicating that certain 2010-2015 Toyota Prius will experience internal malfunctions and require repair for BRAKE BOOSTER AND BRAKE BOOSTER PUMP ASSEMBLIES. Since this is a safety issue, Toyota should extend the program indefinite and repair their faulty systems.

Wednesday morning I went to start my car to go to work. I noticed the brake would not go down. It was difficult to press. I was unable to go to work safely. I brought my car to a mechanic where I was informed it was a faulty brake booster. When I researched online, I saw many many other Toyota owners went through the exact same issue. There is no recall but it’s a huge issue and a a safety problem.

ABS Pump and Actuator failed at 100,000 miles. Traction control, ebrake, ABS light came on while driving. Many other stories of Toyota vehicles with the same failure.