Toyota Prius adaptive cruise problems

Filed Jul 6, 2026 · Acceleration, Engine · IL

Unknown. There were a multitude of codes that appeared on the diagnostics causing problems with engine. The temperature, brake, tire sensor lights are all on. The cruise control is not working. White smoke emitting from tail pipe and engine. Main engine coolant leaking. Car overheating rapidly.

Filed Apr 22, 2026 · Airbags · OR

the cruise control was inop, technician said it was a clockspring failure, replaced the clockspring with a new part from walmart, then at times, the airbag failure light would come on, paid a technician to replace the replacement clockspring with an new one and the failure stopped, walmart is selling a part that could result in death

Filed Sep 19, 2025 · Brakes · 186,000 miles · OK

The contact owns a 2015 Toyota Prius. The contact stated that while driving at various speeds and depressing the brake pedal, the brake pedal went to the floorboard, and the vehicle hesitated while responding. The traction control, ABS, BRAKES, and cruise control warning lights were illuminated. The vehicle was taken to Gasket Masters Inc, where it was diagnosed and determined that the ABS assembly was leaking fluid into the braking system, and the ABS module had failed, causing the brake pump to fail. The vehicle was not repaired. Additionally, the malfunction warning light was illuminated. The vehicle was taken to the dealer, but was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 186,000.

Filed Sep 17, 2025 · Driver assistance · NV

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.

Filed Jun 5, 2025 · Brakes · AL

The brake actuator failed. When the car was diagnosed by the Toyota dealership, they identified the problem as an internal leak within the brake actuator. Luckily, nobody has been hurt attempting to drive the car, but it is still being driven to get it from home to the repair shop so anything is possible. The first symptom I could link to this was in 2023, when the car would not accelerate via the gas pedal after the brakes were pressed during cruise control. Turning off the car and turning it back on fixed the problem. Afterwards, the red brake symbol was turned on. From that point on, the brake light would only shine sometimes. leading me to believe there must not have been something wrong with the car, since nothing else happened after that. 2024 is when the red brake light and ABS symbol both lit up. The only information that I could find in the manual was to take the Prius to the Toyota dealership. I could not find details on the problem. I continued to drive the car regardless because there seemed to be no problem. After letting the car sit for a few months in 2025, I began driving it again, and it was fine. A month later, I turned on my car and was met with a loud beep that did not end. This was my final sign to take it to get repaired. The car has exceeded 200,000 miles. This fix is $3,205.40 at the dealership. My 2007 Toyota Prius is valued between $2k to $4k. The repair would cost more than simply buying another Prius.

Filed Mar 17, 2025 · Lights · CA

The headlights at night are too low. They only illuminate 1 car's length away and Toyota doesn't want to touch it to raise it more. I asked my local dealer SF Toyota Service Center, where I said "It feels dangerous", and they just kinda shrugged their shoulders. This is not a defect, it seems to be as intended (or at least as rolled off the factory floor) because other 2023 Prius owners agree it is aimed too low. Someone believes they were "optimized" for the Radar Cruise Control camera, and not the driver. Some also report that an internal component of the headlight is casting a shadow within the light beam, indicating a second issue related to the headlight visibility. My ask: I want Toyota to fix both issues on my vehicle. I feel limited to day driving which is a problem, especially when I want to do outdoor recreational activities like hiking in the mountains or seeing a sunset at the top of a mountain. The beam cutoff is too low when the road isn't flat. This is especially a problem when there are zero reflectors on the road, which is an issue in areas like the highway into Santa Cruz.

Filed Dec 26, 2024 · Acceleration, Electrical · ID

The light up display for the odometer, fuel gauge, and speedometer does not always light up. When it is not lit, the cruise control and any warning and informative alarms/lights also do not work. This is a well-known issue among owners of these cars, related to the capacitors on the circuit board for the display being defective, and there is extensive documentation of it online. It may also have had a technical service bulletin released for the issue, but I'm not entirely sure. The light goes out intermittently and is not always consistently out. I did mention it to the service personnel when I took it in to get recalls repaired recently, and they didn't seem surprised or unaware of the issue. I did not ask them to diagnose or fix it, as I know I can get it done for a better deal elsewhere.

Filed Apr 28, 2024 · Brakes · MN

We were on the interstate when suddenly our cruise control stopped working. We then noticed several lights on the dashboard lit up, related to traction control, brakes, and ABS system. We could still use the car brakes, but it took more pressure than usual to engage the brakes. We pulled over to an auto parts store, but they stated there were no ODB codes logged. After researching online, I suspected a brake booster failure as described in Toyota's Customer Support Bulletin ZJB. At my earliest convenience, I brought the car in to a Toyota dealership, who confirmed that the brake booster and master cylinder were failing and needed to be replaced. Thankfully, the brakes did not fail outright, but the situation could have ended much worse. I understand by reading online that this is not an isolated incident. I encourage this issue be more thoroughly investigated so that a proper recall can be issued if needed, to bring this to the attention of other drivers of affected vehicles.

Filed Mar 6, 2024 · Brakes, Driver assistance · FL

A warranty extension went out a few years back that said one might receive a "CHECK PCS SYSTEM" warning on the dash. This has happened to us, along with 7 other lights on the dash. Between the brakes being much less responsive, and all of the pre-crash warning / adaptive cruise / radar features being disabled, this could have caused an accident. The dealer checked out the car and states that the brake actuator has a leak and that it will be a costly repair - no less than $3000. This suspiciously all happened *just* outside of the warranty window (we are within the allowed number of miles but just out of time), and also suspiciously after Toyota released an upgraded version of the actuator, and *also* after a bunch of people are experiencing the same failure. Our best assessment at this time is that the brake actuators have a factory defect and that a recall should be done.

Filed Feb 28, 2024 · Acceleration, Brakes · MI

The conditions listed in Toyota Customer Support Program ZJB for the brake booster and master cylinder occurred after the 10 year in service date on my vehicle. Brake, ABS, and Traction control warning lights turn on intermittently and when this happens brake response is poor and cruise control shuts off. When applying the brakes an audible tat tat tat sound can be heard from the front of the car that sounds like the ABS being triggered. You should have toyota recall impacted cars and fix the issue as outlined in the TSB and support campaign.