2021 Toyota Prius — Known Issues & Recalls

Your 2021 Prius unexpectedly accelerated on its own while driving at 35-45 mph, and the brakes didn't respond immediately to stop the vehicle. You had to swerve around other cars and ended up in a ravine; your husband pressed the Start/Stop button to shut off the engine and bring the car to a halt. The dealer was unable to identify what caused the acceleration problem, and Toyota was notified of the issue. The problem may involve the electronic throttle control system or brake system sensors that need diagnostic testing and potential replacement.

Your car accelerated on its own without you pressing the accelerator pedal, and your brakes didn't respond when you tried to stop it. You had to drive through grass and a ditch for about 10 seconds before regaining control of the vehicle. This resulted in a crash. The issue may involve the accelerator system, brake system, or engine control electronics working together.

Carbon monoxide is entering your car's cabin, and the dealer couldn't locate the source or measure the CO levels inside your vehicle. You've experienced poisoning symptoms multiple times, and a follow-up check showed the CO levels increased, making the car unsafe to drive. The fix will likely involve finding and sealing the source of the exhaust leak, which could be a crack in the exhaust system, a faulty seal, or a compromised cabin air intake.

Your Prius's hybrid battery stops charging when it reaches 75% capacity (6 out of 8 bars), and at that point the engine takes over while the battery stops accepting any charge. The car then runs on engine power only instead of using the hybrid system normally, but no warning lights or error codes appear on the dashboard.

Your Prius's lane-keeping assist system sometimes malfunctions during radar cruise control, pushing your car toward the edge of the lane or even veering out of it without warning. This creates a safety risk for you and other drivers. The issue stops after you pull over, turn off the car, and restart it, but it happens unpredictably and dealers haven't been able to reproduce it. Fixing this will likely require a software update or recalibration of the lane-keeping assist and radar cruise control systems.

Your brand new Prius experienced a rear passenger tire blowout while driving on I-4 with less than 200 miles on the odometer. The dealership found an object embedded in the tire and suspects it may have been defective from the factory, though they also mentioned it's possible you hit a large pothole or road debris. The tire will likely need to be replaced, and you may want to have the rim inspected for damage.