NHTSA Complaint #11714867 — 2025 RIVIAN R1S

On February 1, 2026, at approximately 9:09 AM, while driving from a stop and continuing on main roads, the vehicle accelerated to extremely high speeds and would not properly slow down. When I removed my foot from the accelerator pedal, the vehicle did not decelerate as expected. Regenerative braking was nonexistent. Normally, releasing the accelerator provides noticeable deceleration, but in this incident the vehicle continued to propel forward instead of slowing. Braking was extremely difficult. The brake pedal felt abnormally stiff (“thick”) and required significant effort to depress. Even while actively braking, it felt as though the vehicle was still attempting to accelerate forward and did not slow normally. This occurred for a couple hundred yards before I was able to pull over due to safety concerns. At the same time, the vehicle was in All-Purpose drive mode, but the ride height was stuck at kneel height and would not adjust, which is abnormal. After pulling over, the vehicle would not shift into Park. I had to press the brake pedal with both feet while fully depressing it and lifting myself off the seat to keep the vehicle from moving. I then had to open the driver door in order to force the vehicle into Park. There were no warning lights or messages displayed on the dashboard. The vehicle was towed to the Rivian Service Center but has not yet been inspected because the service center is currently closed. This malfunction created a serious safety risk due to unintended acceleration, loss of normal deceleration, difficulty braking, abnormal suspension behavior, and inability to shift into Park.