2023 Rivian R1T

I Was driving down highway and receive a fe messages in quick order -front sensors off, front camera off, collision detection off, regenerative braking off - started moving toward right shoulder prior to pulling off - car lost speed at high rate putting me in jeopardy of being rear ended. 2025.06.012 code was loaded into truck the day before - this was first real drive after new code loaded into truck - early in the morning the warning for front sensors off, collision detection off, regenerative braking off did come and I pulled off and rebooted system. Everything seemed to be fine - made into office and again on return the loss of speed at high rate was a safety issue.

The contact owns a 2023 Rivian R1T. The contact stated while driving at approximately 70 MPH with the cruise control activated while overtaking another vehicle, the vehicle independently activated the brake. The contact had not turned off the cruise control and there were no other vehicles nearby. The contact stated no warning light was illuminated. The contact stated that when the other vehicle had passed the contact’s vehicle, the brakes disengaged, and the cruise control resumed and accelerated the vehicle back to the pre-set cruising speed. The contact stated that the failure was intermittent but had become a recurring failure. The contact had taken the vehicle to a service center; however, the failure could not be duplicated. The vehicle was not repaired. Additionally, the contact stated that when the vehicle fully charged the battery, the indicator showed that the vehicle was at 100 percent charge with a range of 369 miles. The contact was only able to drive a range of 260 miles on a full charged battery before needing to recharge the battery. The manufacturer was informed of the failure. The failure mileage was approximately 7,000.

The components that failed are Traction Control, Stability controls, and Anti-Lock Braking while in high regeneration mode. Vehicle can easily become incontrollable in low traction situations (in high regeneration mode) that is a danger to the driver and others on the road. Sequence of Events 1.Vehicle begins to Aquaplane 2.Driver (myself) removes foot from the accelerator pedal (standard technique to regain control) 3.The tires in the front loose more traction and skid due to high regeneration mode. 4.With even less traction the vehicle is out of control In the moment, my first concern and priority was other drivers. I was able avoid six lanes of traffic in the direction of travel without hitting another vehicle before hitting the should barrier. The vehicle felt like there was no ABS (Antilock Braking System) and no traction control. It felt like the vehicle locked all four wheels (like I had placed the vehicle in park). In addition, I had a service scheduled at the end of May 2024 (scheduled in January 2024) for issues with the rain sensor(s). I do not know if these sensor(s) comes into play. It is my belief that there should be a safety warning when using High Regeneration mode and the vehicle should automatically switch back to Low Regeneration mode with each new startup. I have noticed this feature in other electric cars (Audi/BMW) and have begun to understand why these vehicles perform this function. In addition, I have searched the Forum website and have discovered others that have experienced the same issue related to traction in this mode.

The vehicle was parked on a 8 degree slope in the driveway with approximately 2 inches of snow on the drive way. Within thirty minutes of the vehicle being parked the truck slide down the driveway and crashed into the house. The parking brake failed and or is miss-engineered seeing that only two of the wheels were locked and two rolled noting the tire tracks in the snow. The saftey of myself and others could have been much worse if the truck hadn't hit the house and kept rolling down the hill into an adjacent street or house. There is other vehicle reports of this happening on online forums. The vehicle component has not been inspected by the manufacturer. The issue lies with it being an electrical motor and does not have a differential to lock the remaining tires as in an automatic gas powered vehicle. This company has relied on the parking break to only lock the rear wheels for the parking break despite it being an extremely heavy vehicle.