2014 Toyota Prius electrical problems

Filed Aug 3, 2026 · Brakes, Electrical · HI

I am submitting this complaint regarding a serious safety concern involving the brake actuator/booster assembly on my 2014 Toyota Prius. My vehicle has experienced failure of this critical braking component and has been unable to be properly repaired since November due to difficulty obtaining the correct replacement parts. This involves a major safety system required for proper braking operation. Brake actuator/booster assembly. Diagnostic codes: B1206, B2321, C1252, C1253 C1256. Toyota previously acknowledged brake actuator concerns through Customer Support Program ZJB. However, my vehicle is outside the program limits despite experiencing what appears to be the same type of failure reported by many other Prius owners. Since November, I have faced difficulty obtaining the correct parts, reports of nationwide backorders or limited availability, conflicting information regarding updated Toyota part numbers, and concerns about repair providers advertising new OEM parts that may actually be aftermarket or incorrect components. This creates a safety concern because owners experiencing brake failures may be unable to obtain timely repairs using verified, appropriate parts. Repair estimates have ranged from approximately $3,000 to over $4,000, including a Toyota dealership estimate of approximately $4,100. This creates a significant barrier to restoring a vehicle to safe operation, especially involving a component Toyota has previously addressed through a customer support program. I request that the federal safety agency review this complaint and similar reports to determine whether further investigation is warranted regarding Toyota Prius brake actuator failures, parts availability issues, and whether additional manufacturer action or support is needed. A vehicle’s braking system is a fundamental safety component. Owners should be able to obtain a safe and reliable repair without months of delay or uncertainty regarding replacement parts.

Filed Dec 26, 2025 · Brakes, Driver assistance · NJ

The brake system malfunctioned suddenly. While driving and while stopped, the brake pedal became very hard and braking behavior became unpredictable. The vehicle sometimes brakes aggressively and other times requires excessive pedal force to stop. The ABS and BRAKE warning lights illuminated. The vehicle no longer provides normal braking assistance. This issue is related to a failure of the brake actuator / brake booster, which is a known issue affecting Toyota Prius models from 2010 to 2015. This defect creates a serious safety risk, as braking performance is inconsistent and may increase stopping distance or cause loss of control during emergency braking situations. The vehicle has not been repaired yet because the cost is very high and the manufacturer has declined assistance despite this being a known safety-related defect.

Filed Oct 8, 2025 · Brakes, Electrical · AZ

ABS complete and total failure while driving.

Filed Oct 25, 2024 · Brakes, Electrical · GA

I was driving on the highway during rush hour when a loud beeping noice began. My 15 year old cousin was in the passenger seat and began to check for the source of the beeping. I was driving 55mph on a busy highway with no safe shoulder stop. As I was preparing for the exit, the brakes suddenly became dysfunctional. The pedal was extremely hard to press down and I found myself unable to slow down the car in enough time to avoid hitting upcoming traffic. I found myself in an urgent, life threatening situation and needed to pull over into the emergency lane located before the exit. I could not just consider my safety, but that of other drivers and my 15 year old passenger. She is traumatized. I was able to get the car to stop with my entire weight on the pedal. Once stopped, I scrambled to find the reason for the sudden brake problem, checking if anything rolled under my foot, if the floor mat was loose, if the gear shift was wrong, even checked if I accidentally hit the emergency brake. Nothing was out of place. No new dash lights. I looked in the manual. I had no information. I went to jiffy lube and they performed a diagnostic test and informed me they are unable see all the codes with hybrids because Toyota’s computer can only see Just in August I went to Toyota for my oil change, nothing was said about the brakes needing to be fixed and how repairing them now would prevent the failure of the accumulator pump system. If I had known paying $400-$500 for the brakes then would prevent having to pay $3000 to replace a pump. I would have made that sacrifice and went outside of my budget. This is paramount information that should be disclosed to all Toyota customers that take their car in for care and pay. After further research, I STRONGLY BELIEVE TOYOTA EMPLOYEES PURPOSELY WITHHOLD INFORMATION FROM THEIR CUSTOMERS NOT INFORMING CONSUMERS ABOUT AVOIDING PUMP FAILURE AND THE NEED REPAIR THEIR BRAKES AND IS COMPLICIT IN ANY INCIDENT CAUSED BY PUMP FAILURE MAY CAUSE.

Filed Feb 5, 2024 · Electrical, Lights · CA

I was dropping my daughter off at school and the car completely shut down on me and turned off in the middle of an intersection. I have just had brakes and oil changed but ever since I got the car codes keep popping up and when checked it’s all good. Front lights keep glitching and even with new brakes there is still a bad sound. My dash computer thing keeps going in and out. It happens a lot more when it rains and makes a sizzling sound I’m afraid to drive it in the rain. I’m besides myself how the car turned off on me and my child we couldn’t move I could accelerate and we almost got hit then another light came on and I couldn’t even turn my wheel. Very dangerous

Filed Oct 7, 2023 · Brakes, Electrical · CA

Brakes are not woking at full specification due to brake accumilator having an internal leak c1391

Filed May 2, 2023 · Brakes, Electrical · FL

Good Evening, I'm writing to request a callback in regards to my 2014 Toyota Prius which is subject to a recall. "The involved vehicles were designed to enter a failsafe driving mode in response to certain hybrid system faults. Toyota has found that in rare situations, the vehicle may not enter a failsafe driving mode as intended. If this occurs, the vehicle could lose power and stall. While power steering and braking would remain operational, a vehicle stall while driving at higher speeds could increase the risk of a crash." I recently just moved back to South Florida, I was living in NJ for a few years and had the Inverter malfunction earlier this February, 2023, forcing the car to enter the fail safe mode described giving me the warning to "Check Hybrid System, Stop the Vehicle in a Safe Place". The car was at Toyota Universe, Little Falls, NJ for about 45 days, since this was going to take the complete replacing of the inverter and an update of some sort of software. After receiving the car back around March 17th, I moved back to Florida about 2 weeks later. This evening around 5:30 returning from work, the car stalled again while I was driving surrounded by dense traffic, wouldn't accelerate with all lights flashing. Thankfully I was able to pull over slowly into a parking lot after which my steering wheel locked, and my car was no longer able to be put into Drive or Reverse. Car was only able to shift into Neutral and Park. This was the most terrifying experience of my life had something worse happen in the middle of traffic. I have dropped off my car to the dealership parking lot and will be checking it in first thing in the morning. I'd like to ascertain what I should expect from Toyota Manufacturing should this issue be unfixable? I am more than happy to let them attempt fixing it, but I also need to live a normal life and don't feel the need to be responsible for a manufacturing defect putting my life in jeopardy every time I go drive.

Filed Jun 27, 2022 · Electrical, Engine · TX

The air temperature was probably about 50 or 60 F. On a route I routinely drive , I accelerated up hill normally from 0mph to about 45 to 55 mph. I did not accelerate aggressively. Just after climbing the short hill, The engine suddenly loses all power. I had to pull over. I look under the engine to find five pieces of metal blown out of the bottom of the engine block above the oil pan and oil spilling out onto the ground. The car has about 98,000 miles on it and was maintenance regularly including on schedule oil changes, coolant change, state inspections. There were no check engine lights or electronic error codes to indicate anything was wrong with the vehicle which I would have been able to diagnose and possibly fix. The car had been maintenanced in August/September for winter by myself. On the last maintenance, oil was discovered inside the engine air manifold and throttle body that had to be cleaned out and (The EGR was also moderately carbon clogged). I'm very dissatisfied with how Toyota handled my case. They called twice to ask when I wanted to schedule my next service appointment when they had the car sitting on their parking lot for three months. I also wrote them a detailed email similar to this report asking how Toyota could help and that I could not afford to buy another car. The engine failed and it can be inspected upon request. The vehicle had complete loss of power. The vehicle was towed to the nearest dealer. I have seen videos on youtube.com that show other people replacing blown prius engines and head gaskets. You would see chunks of metal missing from the engine block. The vehicle was not inspected by the manufacturer police or insurance. I could have been hit by another car from behind especially if the hill were longer like on a mountain side or some other situation. Separate issue: Mice enter the two rear ventilation openings to nest in the car. Mice chewed on of the oxygen sensor wires to cause an electrical fault.

Filed Jul 29, 2021 · Electrical, Engine · CA

Originally, Toyota issued a safety recall in 2014 to address the inverter defect in model years 2010 to 2014, an attempt to fix the problem on about 800,000 cars in the U.S. by modifying software that controls the hybrid electrical system. It was intended to fix the overheating problems. The inverter controls the power flowing between the battery and electrical motors. The inverter boosts the battery from 200 - 500 volts. They inspected my car saying it was in excellent condition. After, the software upgrade i had major problems. My original Prius battery with around 65,000 miles stopped holding a charge. My 12 volt battery also died shortly after. And my power outlets in my got super hot and spiratually worked off and on. And my driver seat gets hot when i turn on car even though seat button is off. I am sweating all the time. Plus, i have skin conditions and asma. I talked to dimitri, and they tried to charge me 1200for unnecessary repair. Also, failed to call the federal safety agency as promised

Filed Apr 29, 2021 · Electrical, Fuel system · 44,250 miles · CA

Tl* the contact owns a 2014 toyota prius. The contact stated while driving 75 MPH, the contact released her foot off of the brake pedal and depressed the accelerate pedal however, the vehicle failed to respond. An unknown warning light illuminated and was flashing on the instrument panel. The contact coasted the vehicle to the shoulder of the roadway and stopped the vehicle. The vehicle was not turned off. After waiting for approximately 10 minutes, the vehicle resumed normal functionality. The vehicle was driven to toyota town of stockton (2150 e hammer ln, stockton, ca 95210, (209) 751-4077) to be diagnosed. The mechanic was unable to duplicate the failure. The contact mentioned that while reading the information from the diagnostic test, she noticed that the inverter had not been diagnosed. The vehicle was not repaired. The contact referenced the federal safety agency campaign number: 14v053000 (hybrid propulsion system, electrical system) as a possible solution to the failure however, the VIN was not included. The manufacturer was notified of the failure and confirmed that the VIN was not under recall. The failure mileage was approximately 44,250.