2015 Toyota Prius V

Emergency Brake, Traction and ABS warning came on and stayed on in addition to a five-second interval cycling on of a motor sound under the hood. O'Reilly Auto Parts and then Toyota dealership confirmed the same code that indicated brake booster assembly needs replacing (C1391) **This is a "known issue" but not yet a recall. Toyota did extend the part warranty to 10 years or 150,000 miles - my vehicle has only gone 85,500 and unfortunately is eight months into the 10th year and Toyota is refusing to cover any portion of the repair. I would like to be part of the effort to have this formally declared a recall because I got the quote today to replace the brake booster assembly and it's going to cost half the value of the vehicle! $4000 is the low estimate Bighorn Toyota gave me to do the repair/replacement. Thank you for your help!

NHTSA ID

11696236

Incident

Oct 5, 2025

Brake light + ABS + traction light came on and the brake became harder to control. I was driving in the rain and briefly lost control. Fortunately, no accident.

NHTSA ID

11671770

Incident

Jul 5, 2025

brake failure during operation due to bad brake booster pump and accumulator.

NHTSA ID

11663280

Incident

May 27, 2025

Brakes failing while driving in the rain. I was unable to use my brakes in the rain and headlights turned off while driving too. Took it to the dealer and they won't do anything unless lights are on on dashboard to read the code.

NHTSA ID

11642078

Incident

Jan 30, 2025

The contact owns a 2015 Toyota Prius V. The contact stated while driving at various speeds, there was an abnormal knocking sound coming from the engine compartment. The check engine warning light was illuminated. Additionally, the contact stated while driving at speeds under 65 MPH, the vehicle intermittently lost motive power. The vehicle was taken to an independent mechanic where it was diagnosed and DTC codes: P0300, P0302, P0303, and P0304 were retrieved. The contact was informed that several undisclosed parts needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 162,000.

NHTSA ID

11623185

Incident

Oct 25, 2024

Mileage

162,000 mi

I started hearing the whirring sound from the brake booster that normally only comes on at startup almost constantly, about every 15 seconds. Along with this, a puffing sound and a pulsing from the brake pedal when stopped with the car on, such as at a traffic light. Also, when coming to a stop there would be a shudder from the brakes. After about a month I was driving when 3 separate warning lights lit up on the dashboard and the next time I braked the pedal felt very different than normal, very mushy, and the car seemed to not stop as well. I consulted a repair shop and they told me it’s a common problem with this model: brake booster/actuator failure resulting in a loss of the ABS system. They quoted me over $2000 to make the repair. Internet research confirmed that this is a common problem that Toyota is aware of but refuses to acknowledge as something to be recalled, despite the huge safety risk associated with it. This on a car with only 85,000 miles.

NHTSA ID

11578597

Incident

Mar 13, 2024

My Prius V has slow acceleration and the RPMs seem to go unusually high on acceleration. This makes it dangerous to pull out from a stop sign, etc. in certain situations that would be fine in another car of the same make and model. And recently it has started to throttle up when taking my foot off the gas and even when pressing on the brake. This happens intermittently and randomly. Fortunately no accidents have occurred yet and I'm trying to get the problems resolved with Toyota, but the dealer says it will be hard for them to diagnose when the problem is not occurring and there are no warning lights. Less than 60,000 miles on it.

NHTSA ID

11487615

Incident

Oct 3, 2022

Car hesitates after stopping at a traffic light (5/30/21). After a few seconds the car finally engages (accelerate). Happens infrequently. Brakes seems to be stuck after braking and releasing brakes (7/15/21). Took a few second to acceleerate. Happens infrequently. Car switch to neutral after stopping at a traffic light (9/15/21). Car switch to neutral after stopping at a traffic light (10/12/21.) Car switch to neutral after stopping at a traffic light (10/15/21). Warning lights came on (10/15/21) Diagnosted: pressure control chip for the master cyclinder failed. After braking at a traffic light the car switched to neutral by itself and failed to acceleerate or move forward (10/16/21).

NHTSA ID

11437152

Incident

May 30, 2021

OBSOLETE NOTICE February 13, 2026: This bulletin is now obsolete. Please see T-SB-0009-26.

This bulletin includes basic procedures for performing a rescue charge on Ni-MH high voltage (HV) batteries. This bulletin should be used in conjunction with the applicable model and model year Repair Manual while performing a rescue charge. The GRX-5100 should be used wherever the Repair Manual references the Toyota Hybrid System (THS) charger.

Some 2005 – 2026 Toyota vehicles that have undergone water intrusion may exhibit a condition in which a musty odor is present. Follow the procedures in this bulletin to remediate the odor and address this condition. The purpose of this Service Bulletin is to provide general guidelines and procedures for odor remediation. This Service Bulletin provides a guide on how to prepare and treat the interior of the vehicle for odor remediation. Refer to the applicable model and model year Repair Manual and the EPA (Environmental Protection Agency) website for the most up-to-date safety and precautionary guidelines.

The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.

Acid rain results from rainwater or other airborne moisture that become acidic due to industrial chemical impurities in the atmosphere. If these acidic compounds settle on an exposed vehicle, especially the horizontal areas such as the hood, roof, and decklid, significant damage to the painted surfaces can occur. Acid rain damage can typically be identified on vehicles by the presence of stains on the paint surface that resemble hard water spots. Unlike water spots however, acid rain damage cannot be removed by regular washing procedures. Also, because acid rain can etch and soften the paint, normal buffing or polishing repair procedures should not be attempted. This can cause further damage and result in visible depressions in the paint surface. The following are the three major categories of acid rain damage: •Minor damage: requires only buffing to repair. •Moderate damage: usually requires neutralizing, color sanding, and buffing. •Severe damage: extending beyond 1/2 mil of clearcoat on a pearl, metallic, or solid color, requires neutralization, sanding, and repainting. In cases where acid rain damage is minor, neutralization and buffing with a liquid-type paint finessing product may provide an adequate repair. Only specially formulated products outlined in this bulletin should be used for that purpose. Unfortunately, other than minor damage, there is no simple method of determining the actual extent (depth) of acid penetration other than color sanding a representative affected area until there is no visible etching or depressions, followed by measuring the amount of paint removed with either a magnetic or digital-type film thickness gauge. The procedures in this bulletin are intended for use by qualified body/paint technicians and should not be attempted by inexperienced personnel. It is the dealer’s responsibility to protect and maintain the quality of the vehicle’s paint finish after receipt at the dealership prior to the first sale. Perform frequent vehicle washing, as often as daily, during high heat and humidity periods to minimize the potential for paint damage due to acid rain exposure. This is especially important in geographical areas known for high frequency and concentration of acid rain and industrial fallout.

To prevent brake rotor rust from forming during transportation and storage, wheel film will be used instead of a cardboard type of anti-rust cover. The purpose of the wheel film is to shield the disc brake rotor from weather elements and initial rust before the vehicle is delivered to the customer. Consequently, the film should remain on the wheel for as long as possible.