general problems of the 2010 Toyota Prius - part 1

The abs, brake, tsc lights have all appeared on the dash. When running the obd codes, the error c1391 appears indicating a problem with the abs pump. When under the dash with the vehicle running, one can hear the abs pump engaging every few seconds which is not normal. After resetting the code. The error quickly pops back up. This is a known problem with this model Prius that Toyota is aware of. Toyota has not put out a safety recall for this issue. They refuse to make the repair of a faulty designed abs module, which is obviously a safety concern. The vehicle currently has 128000 miles with no other issues.

Have multiple warning lamps that light up on and off and the brakes in my car get spongy making the braking unsafe. The lights that turn on are the steering/ traction , brake, and abs light. There are multiple complaints online on youtube from similar issues ongoing and no recall made. My mechanic says it indicates a leak however there is no brake fluid missing and on youtube there’s work arounds because people keep getting the same message, yet no recall has been made. This can affect steering and cause an accident. Please recall soon. Including youtube link so you can see all the comments and issues from thousands that don’t know how to report but view to fix temporarily. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Brakes have failed with a dtc c1391 indicating an accumulator leak. The brake booster pump constantly runs. When the dtc is triggered the brake feel becomes suddenly different as regen braking is lost. Appears to be a very common and expensive repair. Toyota has already had recalls and extended repair program for these parts but they are now expired and not covered.

What component or system failed or malfunctioned, and is it available for inspection upon request? brake actuator failed requiring replacement of booster assembly with master cylinder and booster pump assembly how was your safety or the safety of others put at risk? this greatly impacted braking and stopping distance has the problem been reproduced or confirmed by a dealer or independent service center? yes, Toyota dealership has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? yes, Toyota dealership were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? no. These lights appeared after the failure - brake, abs, traction control.

A few weeks ago, while waiting at a traffic light, the brake warning lights (abs, emergency brake, traction control) lights on my 2013 Prius lit up and the brake pedal suddenly becomes much less responsive. I drove carefully back home, and researched online what the problem could be. To my surprise, this seems to be a known problem to Toyota, who had issued a campaign in the past to address this problem (abs actuator, pump) and to replace the known faulty parts for free, but only for owners who were experiencing a failure at that time. Now the recall has expired, and owners like me who weren't having a problem at the time are stuck in a situation with cars that have a known, dangerous fault, while Toyota refuses to help with the problem anymore. The approximate cost for replace/repair is over $4000. All owners should have been included in the previous campaign, whether they were experiencing a failure or not, during that time period since Toyota knew that these parts are faulty.

Toyota issued a recall with a limited time for Prius brake booster/actuator failures. This issue is known to present brake failures and necessarily place drivers, passengers, and pedestrians at risk in the case of such brake failures. Toyota made no effort to proactively remedy this problem and further neglected customer safety by excluding Priuses with the same manufacturing issue from the recall, under its 10 year 150,000 mile requirement. Whether or not the Priuses have been driven 150,000 miles or 10 years the nature with which the malfunction presents represents a safety for any driver.

I purchased a used 2010 Prius on may 1, 2025. On may 5, the car would not turn on. Thought it was the battery. Replaced the battery on may 6. On may 8, the battery was dead again. I jumped the car and tried driving it to the Toyota dealership to have it looked at. On the way a loud beeping sound started and the abs light came on. I pulled over and noticed the brakes felt strange. After having it towed to ourisman Toyota, the told me the brake booster was broken causing the battery to drain. The cost for repair is a little over $4,000. This almost half of what I paid for the vehicle.

Code diagnostic c1391 abs system. I have replaced this in my previous 2009 Toyota Prius, it has been replaced in this 2010 Toyota Prius, and now needs to be replaced again in the 2010 Toyota Prius. It’s incredibly dangerous, no warning signs, spongy brakes all of the sudden that barely feel like they’re going to work. It puts not only myself in danger, but others especially when it just happens without warning and all of the lights come on as you are driving and the brakes become extremely wonky.

While driving on the freeway the traction control light, abs light, brake system light and brake light all came on. Fortunately I haven't had any issues but when I took it to the a dealership I was told that the brake booster and pump need to be replaced as the master cylinder was leaking into the brake fluid and given an estimate of $3500 for the repair. People online have said that after having this issue the brakes can go out at any time. I am unable to pay for the repairs at the moment so I have to drive with the knowledge of having my brakes going out at any time.

My brake booster master cylinder and pump assembly went out while driving on the freeway. My brakes became soft and unresponsive, though I was able to exit the freeway without incident. My abs light, brake light, and traction control lights all came on. The lights have since remained on and my brakes continue to malfunction. My local repair show diagnoses the issue with the diagnostic trouble code: c1391 back in 2018, before I owned the car, Toyota offered an "extended warranty" to have the parts replaced for free for 10 years or 150,000 miles, whichever came first. I'm past the year threshold but well short of the mileage one. I feel a recall should be made and the repair covered, as this is clearly a safety issue.

My abs system light is on. The Toyota mechanic has determined that it is due to nitrogen gas from a component of the brake booster pump assembly could leak into the brake fluid. As nitrogen is released into the brake fluid, the brake pedal may have reduced hydraulic pressure. Under certain circumstances, this condition could affect stopping distance and increase the risk of a crash. Toyota recalled model year 2010 Prius vehicles manufactured March 31, 2009, through October 9, 2009. I took my Prius to Toyota to fix this abs recall problems but they are refusing to fix the problem for free. They are charging me $4000 to fix it.

We have a 2010 Toyota Prius. All the sudden we got errors/warnings on our dash about abs and traction lights, and brake light, staying on all the time. Brakes extremely sluggish, and from doing research advised not to drive it. Toyota did a diagnostic test which came up as c1391, bad abs booster pump and master cylinder. This is a huge safety issue, others have reported brakes completely going out on the highway, and also reporting Toyota is not paying for fixing the issue, and only "certain Priuses" meet their criteria to pay for repairs. There supposedly was a recall at some point but we never received it. I have contacted Toyota America and waiting to hear back. It is going to be very expensive to repair, about $3500-$4500. Yes, it is a 2010, but from what I'm reading and hearing is a major safety issue and Toyota needs to be held responsible and honor/extend any and all recalls. Again, I'm waiting to hear back from them, but was advised by many other Prius owners to file a complaint with NHTSA.

- brake system failure - safety risk due to longer stopping distance - problem was reproduced and confirmed by two repair shops - components were inspected by repair shop - several brake warning lights were on on dashboard after failure occurred. Toyota recalled 2010 Prius vehicles for brake booster and brake booster pump assembly failures. Recall code d0h. Toyota claims that the replacement parts are fixed for the gasket leak issue. Toyota replaced these parts on my car in 2013 as part of the recall. The replaced parts labeling are verified to be the claimed fixed ones. But only about 62,000 miles after the d0h repairs (odometer at 81,400 miles) the parts failed again on March 20, 2015. I do not put many miles on my cars. Toyota has put a maximum repair date for this issue knowing failures keep re-occurring (no repairs supported after 2019). Toyota has not fixed this issue given the repeat failures. Repairs for this issue is extremely expensive at more than $4000 at independent shop (parts and labor).

I am writing to express my concern regarding an issue with the pcs system dash lights on my 2010 Toyota Prius. I recently became aware of problems related to the brake booster system, which I understand have been addressed through recalls or warranty extensions on certain models. I believe that the issue I am experiencing should be covered under warranty, and I kindly request your assistance in resolving this matter.

Brake booster, brake accuater went out even after the recall. Dealership said they could do nothing to help.

C1391 error, "abnormal leak of acc press". This is a common failure in many Prius and requires the replacement of the brake master cylinder and brake accumulator. Toyota has an expired customer support program but no actual recall. Parts were replaced to bring braking system back into working condition.

While driving at a high speed in the left lane of a 2 lane interstate a car in the right lane merged into me. Luckily I was able to brake in time to avoid a collision, unfortunately the sudden braking at a high speed caused my car to loose all control. Upon braking my front tires lost all traction and shifted my car to the right, I remained horizontal sliding across the highway for an unrecognized distance (my guess is 10-20 meters), before shifting another 90 degrees to the right leaving me backwards. At this point I had shifted across both lanes and the emergency lane, I was backwards in a grass border on the right side of the interstate. If this had been any other sort of barrier I may not have lived. This incident has not been reproduced or confirmed by a dealer or independent service center. The vehicle had recently had its worn brake components replaced in response to a similar incident happening, which I first attributed to worn brakes— this theory was supported by the brake technician prior to service. I have had a tire pressure light on since I purchased the car, but this was explained to me as a malfunctioned tps.

Break booster fail. Will cause the breaks to fail. There was a voluntary recall on these but I never recieveed the letter in the mail. Thr break booster failed after the voluntary recall was up. Toyota said they cannot help with this. Other Prius owners I talked to have the same issue with their 2010 Prius break boosters and also did not get the letter in the mail.

Abs pump/motor failed. Lost power and control over the breaks . Abs light on.

Abs lights on, traction light on . Actuator running cicle constantly . Breaks felt spongy.

I was coming to an intersection where two cars were waiting for a right turn. I pressed on the brakes and nothing happened. The car continued to move without slowing down. The brakes felt "blocked" and unresponsive. I engaged the manual break at the last moment and that slowed me down. But I still hit the car in front of me which in turn hit another car in front of it. The police report says "following too close". But I was not following other cars. The two cars were already at the intersection. I was just coming to this intersection and attempted to slow down as usual. Except that the brakes did not respond. My car was a total loss.

Twice while I was driving on the highway, my abs and brake light came on, and my brakes became less sensitive to pressure. That is to say, it took more effort and I had to push my brakes further towards the floor in order for them to respond. I went to an independent mechanic and got the code c1391 which indicates a brake pump accumulator issue. I went to a Toyota dealership and and had the car inspected. They confirmed the c1391 code and said the brake booster assy with master cylinder pump assy was malfunctioning. However, I was never told by Toyota that this issue meant my brakes could fail at any time. My safety and the safety of others was put at risk because my brakes spontaneously became less responsive, my stopping distance was increased, and they were at risk of spontaneous failure.

I recently had an issue with the brake actuator on my 2010 Toyota Prius, showing error code c1391. This caused reduced braking efficiency, and research shows it’s a common safety concern with Priuses. While there was a recall, it has expired, leaving owners like me without support. I kindly request an investigation to address this critical issue for the safety of all affected drivers.

The contact owns a 2010 Toyota Prius. The contact stated while driving at undisclosed speeds, while depressing the brake pedal the vehicle failed to come to a complete stop and the brake pedal was firm. No warning light was illuminated. The vehicle was towed to a local independent mechanic where it was diagnosed and determined that the brake module needed to be replaced. The local dealer was not contacted. The vehicle was not diagnosed or repaired due to the cost. The manufacturer was made aware of the failure. The failure mileage was approximately 117,000.

My brakes stopped braking but luckily I could drive slowly into a curb in my neighborhood. God knows what could’ve happened if I was on the freeway. All the dash lights came on at the same time so I ran some codes; it came back c1391 - the brake actuator is broken. Toyota will not cover it despite this being a very common issue. My car is undriveable until this gets fixed because it will not break.

Abs, traction, and brake warning lights came on. No obd code reading. Mechanic says needs brake booster pump; brake booster master cylinder. Theoretically mine were serviced but no way for me to actually verify it happened on the recall. Vehicle located in kamuela, hawaii.

The contact owns a 2010 Toyota Prius. The contact stated that while her husband was driving 25 mph, the brake pedal was depressed but the vehicle failed to respond. The contact stated that several unknown warning lights illuminated with an audible chime being heard. The contact's husband pulled over to the side of the road and depressed the brake pedal and the pedal went to the floorboard and the brakes started to respond as needed. The vehicle was towed to an independent mechanic where it was diagnosed and determined that the brake pads and rotors needed to be replaced. The vehicle was repaired but the failure persisted. The contact stated while driving at an undisclosed speed, the brake pedal was depressed, and there was an abnormal sound coming from the brakes. The contact stated that the brake pedal went to the floorboard. The contact then towed the vehicle to the residence. The vehicle was taken to the dealer but was not yet diagnosed or repaired. The manufacturer was made aware of the failure and offered a customer satisfaction program extended warranty repair. The failure mileage was approximately 105,336.

Hope this message finds you well. I am reaching out regarding a potential recall issue with my 2010 Toyota Prius. The vehicle's VIN is [xxx] , and I am currently located in the austin area. Recently, my vehicle has been experiencing problems related to the brake system, specifically the brake booster pump assembly. The diagnostic results returned codes c1241, c1391, and c2300, which point to issues such as abnormal leaks in the accumulator pressure and actuator system malfunctions. Given that this issue may fall under a recall or extended warranty for the brake booster pump assembly, I would appreciate it if you could confirm whether my vehicle qualifies for this service. If it does, I would like to schedule an appointment to bring my car into the nearest authorized service center to have the necessary parts replaced. Please let me know if any additional information is needed. I look forward to your response and would greatly appreciate your assistance in resolving this matter as soon as possible. Thank you for your time and support. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Abs and brake lights lit at around 141000 miles code c1391 came up during diagnosis.

Heading westbound on I-70, taking exit 29 off ramp from highway, I drove over uneven pavement. My traction control, abs and brake lights illuminated, the brakes suddenly felt mushy. As I approached the stoplight at the end of the exit ramp, I questioned whether I would be able to stop. Scared me immensely. Luckily no cars were near me. I now do not have abs, traction control, stability control or regenerative braking.

Toyota refuses to cover a recall that I was never made aware of. My Prius need to have abs brake accumulator and other components replaced. My VIN I was told had a recall but I was never made aware. I was told it may not be safe to drive my car. Toyota told me I would have to cover all cost for the repair and for my family that is just not possible. For the safety of my family, I am hoping NHTSA can help me in anyway.

Nhtsa campaign 13v235000 Toyota will notify owners, and dealers will replace the affected brake booster pump assemblies. The recall is expected to begin late July 2013. Owners may contact Toyota at 1-800-331-4331. Toyota is no longer honoring this recall. They think it is acceptable for me to drive around with unsafe and defective brakes.

The contact owns a 2010 Toyota Prius. The contact stated that occasionally when braking the car lurches forward, on one occasion the contact vehicle bumped another car while attempting to exit a parking lot, however no damage was present, therefore no police report was filed. At first the contact did not think much of it, however the contact continued to notice the forward lurching while braking, on another instance the braking caused the contacts vehicle to completely shut off. The contact drove her vehicle to a independent mechanic for inspection, where the contact was advised the issue stemmed from her vehicles abs system. The contact has not notified the manufacturer of her vehicles failure. The approximate failure mileage was undisclosed.

In 2015 I purchased my Toyota Prius in va. I now live in indiana and had my car checked for a possible sensor issue because the traction, brake & abs light were coming on and off. The diagnostic showed a brake accumulator leak malfunction. I contacted Toyota dealership once I was told there was a recall. The dealership said that it was showing it was replaced in 2013 from the previous owner in va. It was listed then as a recall. I contacted Toyota corporate and they said that it went from a recall to customer support with a maximum of 150,000 miles. I did not have any more problems until just recent. My argument is once a recall it should still be repaired. The part appears to be the problem. It is a safety issue and I need Toyota to fix the problem. Thank you!.

The contact owns a 2010 Toyota Prius. The contact stated while driving approximately 40 mph as he depressed the brake pedal to slow for traffic he observed that the brake pedal was stiff and was taking more force to depress. The contact stated that abs, stability track and the emergency brake warning light had illuminated. Additionally, the contact stated that a chime was also sounding and could not be turned off. The contact stated that the failure had been intermittent but was recurring. The contact had not taken the vehicle to a local dealer or independent mechanic. The vehicle was not diagnosed and was not repaired. The contact had researched online and related the failure to NHTSA campaign number: 13v235000 (service brakes). The manufacturer was not informed of the failure. The failure mileage was approximately 77,000.