Adaptive Cruise Control Problems of Toyota Prius

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.

See all problems of the 2012 Toyota Prius 🔎.

Infotainment screen stuck on "experience drive connect" screen which disables all the safety devices on the vehiucle. Oem needs to update the software to remove this screen. Screen is tied to Toyota subscription service. I believe all new Toyota products would have this vulnerability.

See all problems of the 2025 Toyota Prius 🔎.

The 2013 pruis has developed the notorious brake booster fault triggering the brake light abs light and traction control light to stay illuminated. Toyota has many complaints about this brake booster issue and needs to recall and fix this issue as they have done on other Toyotas. This is leaving owners with a $2500 repair or having to take a big risk driving these cars with a big prevalent brake issue that Toyota needs to be held accountable for.

See all problems of the 2013 Toyota Prius 🔎.

Coming to a yellow light, I braked and the vehicle made a strange sound with loss of braking, so I sped up instead, having to go through a red light. Shortly after, that afternoon, when I again started the vehicle, the safety lights lit up in the dashboard and my vehicle kept making a strange cycling noise. As it turns out, it was the whole brake actuator assembly. Under great financial hardship, I had the vehicle repaired ($4300+). I applied to Toyota corporate for help but they denied it, saying I was outside the extended warranty. I’ve since learned this brake problem was a known issue, and Toyota settled a class action settlement. My vehicle has only 90,000 miles on it, and it is has been used primarily as an in-town vehicle, our only car. I’m asking for a recall and reimbursement on repair for affected vehicles. Toyota has been allowed to get away with responsibility for a known issue by putting it into a extended warranty program, now expired. Meanwhile, this dangerous, known defect continues to happen to unsuspecting drivers. I was lucky with my incident, as no cars came out when the light changed, but it could have been a different outcome.

Abs unit failure (may also be called abs control module actuator and pump assembly). Three mechanics, including a Toyota dealership, is unable to reset the system to correct. The pcs system cannot be disabled which, in turn, means cruise control is no longer operable.

Nothing wrong with it.

See all problems of the 2010 Toyota Prius 🔎.

The lane keeping assist used in radar cruise control mode during some drive cycles will attempt to maintain the vehicle position to the far extreme of the lane and in some cases actively veer out of the lane. My safety ant others can be put at risk when the vehicle behaves outside of its design parameters like this. To solve the issue the vehicle must be pulled over, turned off, then restarted. After the restart it will resume functioning normally, maintaining lane positioning as intended within the limits of the system. The trigger for this is unknown but could be speculated that it is drive cycle dependent and may start during initialization. The problem has not been reproduced by a dealer or service center due to its intermittent nature. There are no warning indicators or lamps on when this occurs.

See all problems of the 2021 Toyota Prius 🔎.