November 2, 2026 approximately 1:37pm I was coming to a stop intending to take a left turn onto a Highway. As I applied the brake the car suddenly lunged forward almost throwing me into oncoming traffic at very high speeds. I was far too close to colliding or being thrown in front of a car that was traveling in the nearest lane. They took a lane change that was thankfully clear for them to do. This specific part of the highway had a fatality crash just 3 days prior. Suddenly, lights show up on the dashboard including ABS, brake, traction control and the warning light. The brake actuator assembly failed. From what I’ve seen this is a known issue that Toyota has acknowledged with a specialized warranty that my vehicle has aged out of. However the most crucial is I am well under the mileage for the part to have failed due to ware and tear. This was a manufactures fault. Tomorrow I will have the car inspected and confirmed that the failure occurred.
Toyota Prius C abs comes on
21 of the 194 owner complaints about the Toyota Prius C describe aBS light or ABS activating, most of them for the 2012 model year.
- owner complaints
- 21
- worst model year
- 2012
- typical repair cost reported
- $3,450
By model year
Often reported together
Trouble codes mentioned
C1391 3C1256 1C1252 1
What owners say
The brakes failed while driving at a high speed (55 MPH) on the highway along with failing when braking at a low speed (15 MPH) near a major intersection. This occured with no warning other than the Brake, ABS, and Traction Control appearing as the failure was occuring. The warning light when away after the first occurance and the brakes began working again within a few moments. It then reoccured and the lights did not turn off and the car began beeping. My safety, along with my passengers safety and the safety of those who were in the area was put at risk. The highway failure occured in a high traffic area which was also a construction zone so workers were at risk. It has been confirmed by an independent service center that the Power Brake Booster and Brake Master Cylinder Assembly failed. There were no sypmtoms or warning prior to this dangerous failure. After researching this issue, I have found that this is a common issue but no recall has been issued, only a Customer Support Program Bulletin, of which I never received. This is extremely troubling due to the nature of brake failure at both high and low speeds can put not only the driver at risk but those who are near the vehicle experiencing the brake failure. Repairs are currently in process at the cost of approximatly $3,200.
While driving 65 mph on the expressway on January 12th, 2026 under cruise control, I tapped my brakes to slow down. My brake warning light came on, along with the ABS warning light, and the anti-swerve warning light. Cruise control no longer worked, and my brakes were noticeably hard to apply. I immediately had the vehicle computer checked and the issue is a leaking brake booster component, a faulty part known by Toyota to fail prematurely with this and other Prius models. No recall was issued however. The car is now unsafe to drive until a ~$4000 repair is done, according to my service representative.
Car suddenly needed a jump start and again after a day or two of non-use. On the third day Brakes, ABS and traction control warnings were lighted up and remains. Brakes are mostly ineffective. My own scan returns the code C1252 and C1256 that says brake booster system failing. Took it to the dealer who charged $290 again to scan and came up with failed brake booster and pump assembly. The dealers is quoting total $4000 to fix. Toyota Customer Support Program Bulletin dated 8/2018 and revised on 8/2019 extends the warranty on for this issue (for Toyota Prius C 2013) for 10 years or 150000 miles. I was never informed by Toyota or the seller (Stevens Creek Toyota, San Jose CA) about this defect under warranty that I could have gotten repaired well before the dead line of 10 years. Now Both Toyota or the dealer's service department refuse to bear the repair cost.
Warning lamps for ABS and others and the chiming dings came on while pulling away from the bank drive through and parking for a second. I shut the engine off and turned back on with no success. I was barely able to park in a spot because of difficulties braking. My car had been making an electric noise every 15 seconds or so previously, at different times when parked, but I thought it was the hybrid engine. Now I think it was the brake pump trying to build up pressure due to a faulty, leaking brake actuator.
I own a 2012 Toyota Prius C with approximately 156,578 miles. The vehicle has been diagnosed with C1391 – Abnormal Leak in Accumulator, which causes the brake actuator to lose hydraulic pressure. This results in frequent buzzing from the actuator pump, illuminated warning lights (BRAKE, ABS, Traction Control), and loss of ABS and stability control. The condition increases stopping distance and creates a serious safety hazard. Toyota previously acknowledged this exact defect under Customer Support Program CSP 21TE01, which covered brake booster and pump assemblies for certain Prius and Prius C models when codes such as C1391 were present. However, the program expired on November 30, 2022, and my vehicle is just over the 150,000-mile coverage limit. Despite this, my Prius exhibits the same defect that Toyota has already recognized as a safety-related issue. Toyota Carlsbad confirmed the diagnosis and quoted $3,399.55 plus tax for repair, with a reduced courtesy estimate of $2,817.86 plus tax, but declined goodwill assistance since CSP 21TE01 expired. Given the widespread reports of brake actuator failures in Prius models, I believe this represents a systemic safety issue that warrants the federal safety agency investigation and potential recall/extended coverage.
Brake Actuator and ABS Accumalator failed. It is a common failure reported by multiple owners on these cars. I was on the high way going 70 when it failed and lost any brake boost I had putting me in a very dangerous situation where I narrowly avoided an accident. Upon scanning the car's codes I got code C1391 which I looked up and saw a bunch of other people who were also struggling with this issue.
I am writing to express a complaint regarding the issues I have experienced with the brake system of my Toyota Prius C, 2012 model. For the past several months, I have noticed that the brakes exhibit strange noises, soft pedal sensation, reduced braking efficiency, were driving and the ABS, traction, brake, and that other light turned on and the brakes became slow these issues have been observed on multiple occasions and pose a safety risk to myself, other drivers, and pedestrians. I have taken the vehicle for inspection, but the problems persist or have not been definitively resolved. I believe these faults may be related to defects in the braking system, and therefore I request a thorough inspection and necessary repairs at no cost, considering that the manufacturer could be responsible for manufacturing defects.
There was a driver side collision and the airbags did not deploy. Brakes do not slowly apply they slam down causing vehicle to slide/skid in emergency braking, ABS does not function properly. The dealership recently did an appraisal (4/2/25) on the vehicle that states “Lost communication with side airbag sensor LH, Side airbag sensor LH initialization incomplete, front speed sensor RH & LH circuit, and D- Door Motor ECU communication stop”. Insurance company inspected vehicle after crash, and there was a police report filed. There were no warning indicators prior to incident or after.
My ABS actuator failed. Turns off the boosted braking and cruise control. This is a known issue in Toyotas and it always happens outside the warranty window. This is putting my safety at risk as the brakes don’t work as they’re supposed to
Related recalls
No recalls on record for this model year.
Questions about the Toyota Prius C abs
Why does the abs come on in the Toyota Prius C?
Owners who report it most often also describe multiple warning lights, adaptive cruise control problems and won't start, and the codes they mention most are C1391, C1256 and C1252.
Which Toyota Prius C years have aBS light or ABS activating problems?
The model years with the most reports are 2012 (11 complaints), 2013 (9 complaints) and 2014 (1 complaints).
How much does it cost to fix ABS light or ABS activating on the Toyota Prius C?
Owners who mentioned a price put the repair at about $3,450 (median of 9 complaints that include a dollar amount). Costs vary with mileage, warranty and where the work is done.
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