NHTSA complaint #11546153

Owner complaint summary

ACC phantom brakes on highways causing dangerous situations with vehicles following behind and also causing driver panic events particularly when phantom braking occurs most commonly on bends of highways or on single lane highways where it reacts to oncoming traffic. The most common way phantom braking triggers is while traveling on single lane highways with shoulders where there are objects on the side of the highway (either parked cars, trailers, or large structures) particularly when coming around a curve or bend (most unreliable on mountain highways). It will quickly react and cause the Rivian to rapidly brake/decelerate. When occuring on highways with bends it can cause unexpected reactions from cars following behind not expecting sudden braking of the vehicle ahead mid bend. The best way to mitigate is to apply pressure to the accelerator pedal to override the braking. It has happened numerous times since our ownership started 2 months ago. It’s received 3 over the air updates in that time and it continues to have phantom braking with update 2023.34.0.