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.

1. The powertrain, acceleration system, and defrost system failed. The vehicle unexpectedly entered Limited Performance Mode, but instead of allowing reduced acceleration as expected, it resulted in a complete loss of power and left us stranded in traffic. Additionally, a defrost system failure warning appeared, causing a loss of visibility. The vehicle is currently at a Rivian service center, and it should be available for inspection upon request. 2.The vehicle became completely unresponsive while on a single-lane on-ramp overpass, leaving us stranded in moving traffic. Other vehicles were traveling at 50-60 mph, and drivers had to swerve abruptly to avoid a collision. This failure created an imminent risk of a rear-end or multi-car accident, putting my wife and me—and other drivers—at serious risk of injury or death. Additionally, the defrost failure further compromised visibility, making it even more dangerous to remain in the vehicle while waiting for assistance. 3.The vehicle is currently at the Rivian service center, but Rivian has not yet provided a definitive diagnosis or explanation for the failure. We are awaiting their response and further inspection. 4. The vehicle is at Rivian’s service center, where it is undergoing inspection by the manufacturer. However, it has not yet been inspected by police or insurance representatives. 5. Yes, the “Limited Performance Mode” message appeared, but according to Rivian’s own system, the vehicle should have still allowed for reduced acceleration. Instead, it lost all power completely, leaving us stranded. Additionally, a defrost system failure warning appeared at the same time, preventing us from defrosting the windshield.

Rivian passenger airbag is usually disabled (70 % cases) with adult passengers weighing about 125 lbs while they sit correctly in the front passenger seat. There is a warning light "Passenger airbag off". No problems with heavier passengers (> 140 lbs). There are tons of threads about this issue on Rivian forums, Reddit or Facebook groups. Based on these threads, sometimes Rivian service centers try to fix it (often unseccessfully) and sometimes they say it's normal. I've contacted a Rivian service through the Rivian app and they told me that it's a normal behavior because 125 lbs is near the treshold. But I never had similar issues with other cars.

When driving on the highway with ADAS on with lane keeping assist turned on with software 2024.39.01, the truck would constantly pull me back into the center line even if I were not close to the white line on the road. This is very concerning as on a two-lane highway, it pulled me over the center line and towards an oncoming traffic. The latest software update seemed to make it more sensitive, not allowing "ping-ponging" and trying to keep the truck almost too centered, as other cars I have are not this aggressive. I ended up turning off LKA, but that should not be the solution.

The passenger side airbag notification shows that the airbag is disabled when a passenger is seated in the seat and the car is moving. This happens very frequently when driving at various speed. If the passenger is not seated exactly at 90 degrees deeply in the seat in a perfect position, the airbag will be disabled. The sensitivity of the airbag sensor is very concerning. No one will sit straight position perfectly in a car, especially on longer rides and this is very scary to put the passenger at risk. The vehicle has been brought up for service for this particular issue and there has been no resolutions as it is deem "per the specs" by the service center. The problem has been reproduced by them, but again it was not repaired or fixed since it is diagnosed as normal operation.

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.

Concern: - Passenger seat not detecting person sitting in it. Airbag not arming. Cause: - The Occupant Classification System (OCS) uses a pressure sensor in the seat bottom to classify whatever is in the front passenger's seat. An improperly seated occupant can "trick" the OCS into possibly classifying the occupant incorrectly. Being improperly seated can include improper use of child restraints, improper posture such as leg placement, reclining the seatback too far back, weight of the passenger that is too close to threshold values (movement might effect the narrow weight distribution, gray zone), and using aftermarket cushions and coverings on the seat. If the occupant is a child in a properly secured child-restraint, or if there is no occupant in the seat, the "Passenger Airbag OFF" telltale is expected to be illuminated. For adults, the "Passenger Airbag ON" telltale should be illuminated at vehicle startup. At this time, the occupant protection sensors and modules are functioning as designed.