Collision Avoidance complaints by model year
| Year | Complaints | Share of year's complaints | Typical mileage |
|---|---|---|---|
| 2025 | 3 | 19% | — |
| 2024 | 1 | 4% | — |
| 2023 | 1 | 5% | — |
| 2021 | 1 | 17% | — |
| 2020 | 2 | 14% | — |
| 2019 | 4 | 13% | 16,000 miles |
| 2018 | 1 | 3% | 39,000 miles |
| 2017 | 1 | 1% | 7,000 miles |
| 2016 | 2 | 1% | 70,000 miles |
| 2015 | 8 | 5% | — |
| 2014 | 5 | 2% | — |
| 2013 | 13 | 3% | — |
| 2012 | 4 | 1% | — |
| 2011 | 5 | 1% | — |
| 2010 | 19 | 1% | 134,000 miles |
| 2009 | 5 | 1% | — |
| 2008 | 3 | 0% | 100,000 miles |
| 2007 | 2 | 0% | 85,000 miles |
| 2006 | 1 | 0% | — |
| 2004 | 1 | 0% | 154,000 miles |
Which parts fail
Components named in complaints (automatic emergency braking, adaptive cruise, lane keeping, backup camera).
Mileage when the problem started
What owners report
As I was pulling my car into a parking space with the brake applied lightly, the car suddenly lost braking and lurched forward when the front wheels touched the curb. This caused the front of the car to jump the curb and hit a tree a foot or two away. My foot was on the brake during this and the car did not brake automatically, or engage any other sort of safety measure. This was terrifying and I could have easily hit a pedestrian or injured myself and the passengers of my vehicle on impact. I completely lost control of the vehicle's braking due to this issue. Since the incident happened today, my vehicle has not yet been inspected. No warning lamps of any kind had been activated. The car was nearly brand new. Upon further investigation, there are numerous reports of similar events happening to Toyota hybrids over the years. A simple google search for this turns up many reports. …
2025 Toyota Prius XLE. The upgraded 12 inch infotainment flickers light then dark then back to light several times. Automatic braking is being turned off without knowledge. The Toyota cruise control and adaptive cruise control will say unavailable or see owners manual. Different safety features will turn off on their own. The 12 inch infotainment center will switch from Apple car play to regular radio (Sirius Xm) on its own.
I was idling at a parking space and went to turn off my car. The vehicle surged forward and the BRAKE sign came on. I pushed my brake to the floor and nothing happened. I was moving toward a brick wall so I put in in reverse and the car surged backwards. The BRAKE sign came on and I pushed the brake to the floor and again nothing happened and I ended up hitting the car behind me. I immediately took my car to the dealership where they kept it for 3 days and said they could find nothing wrong and it was safe to drive. I just got it back from having the body work done and am afraid to drive it as this might happen again or worse. I am reporting it to let you know and to see if this has occurred and been reported as happening in this make and model previously. I also have 2 witnesses to what happened.
Whenever it rains the warning message clean parking assist sensor comes on while you are driving. Even after you clean the sensors the warning continues to beep contiously. You can press the back button but it will not stop. Also proximity sensor comes on with this incident. After the rain stops the problem stops.
Failure of brake pump and brake cylinder assembly system, resulting in reduced braking ability and stiff brake pedal. Per Toyota's diagnostic: trouble code C1391 is present, abnormal leak in accumulator, replaced brake ABS actuator assembly, along with brake master cylinder, and bleed the brake hydraulic system. No warning lamps or safety indicators prior to failure. Upon failure (while on freeway going 50+ MPH) the ABS, Brake, and traction control warning lamps illuminated. The failure resulted in no accident or injury, however it did occur while on the freeway going freeway speeds, and resulted in difficulty in braking, which was dangerous. Took Prius into Toyota dealer for diagnostic and repair, was told that part was known to fail in this model of Prius, and had a manufacturer designated extended warranty for 10 years or 150,000 miles. …
Code DTC C1391 - Abnormal leak of accumulator pressure. Internal failure of the brake booster pump assembly, preventing the system from maintaining proper hydraulic pressure. This means the brakes don't work, putting the driver's and passengers' lives at risk. This DTC C1391 code and problem were reproduced and confirmed by an independent service center who specializes in 3rd generation priuses. There were warning lights that lit up when the brakes failed - the ABS, traction control, and brake light all lit up but only after the brakes had stopped working. This is a known manufacturer defect but toyota won't pay to fix it because they put a 10 year limit on first driven date or 150,000 miles. This prius only has 100k miles but toyota still won't stand behind their product even though they have admitted it was a manufacturing defect and they sold a defective product.
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.
The traction control, abs, and emergency brake light came on. We checked and the code produced was C1391. There's a humming noise every 10 or so seconds when idle. The humming noise is also present when braking. We did some research and this appears to be an issue with Toyota Prius. We called the dealership and were informed that this was not a known issue. Thank you.
Related recalls (1)
Back over prevention › Display function
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2022-2026 Toyota, Lexus, and Subaru Solterra vehicles equipped with a Panoramic View Monitor (PVM) system. Please see the recall report for a complete list of models.
Remedy: Dealers will update the parking assist software, free of charge. Owner letters were mailed January 2, 2026. Owners may contact Toyota's customer service at 1-800-331-4331.
Frequently asked questions
Which Toyota Prius years have collision avoidance problems?
By NHTSA complaints, the 2010 (19), 2013 (13), 2015 (8), 2009 (5) and 2011 (5) model years. Collision Avoidance complaints make up 1% of all complaints for the 2010.
Is there a recall for Toyota Prius collision avoidance problems?
Yes — 1 recall, including 25V-744 (display function, Oct 30, 2025). Recall repairs are free at authorized dealers; check a specific car with the VIN recall check.
At what mileage do Toyota Prius collision avoidance problems start?
Across all years, half of the complaints with a recorded mileage happened before about 78,000 miles; 40% happened before 50,000 miles.
What part fails most often?
Owners most often name the automatic emergency braking (63 mentions), followed by the warnings (14).
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.