Phantom Braking - Automatic Emergency Braking (AEB) fires spontaneously

[booker]

I've had a series of incidents in my Gen2 R1S where I've been driving along and the Automatic Emergency Brakes have fired on my Rivian. I wasn't using autonomy - just normal driving. It's terrifying when it happens - I'm driving along at about 30-40 miles per hour, no other cars around me and suddenly the alarm goes off, screen flashes red, and the brakes engage - jolting everybody in the car. They release before a full stop but it can be quite a jolt. Thankfully, so far there's been no cars behind me. The road where this keeps happening to me is a bit winding but not excessively so. It is a little shadowy due to trees and steep banks. It's happened in good and bad weather - night and day. It's clearly very dangerous.

When this happened to me a couple times and I disabled the feature (AES) - not realizing that it would turn itself back on again. So it happened a few days later and I reported it to Rivian and brought the car in. They had the car for several days but couldn't find anything wrong - and couldn't find the incident in the logs without the exact time. So I played the guinea pig and waited for it to happen again - this time capturing the incident (they showed me to do this). So now they had the logs. They still didn't find a smoking gun so they asked me to get the latest update (they actually pushed it to me) and see if it happens again. It just did (5 times in a short stretch, during rain this time). Now they are asking me to hard reset the vehicle (which I just did) and see if it happens again.

What frustrates me the most is that I can't turn off AES (other than disable it in settings every time I drive the car). Has anybody else had this happen to them? I've seen a few forum posts about the issue in stop and go traffic I haven't seen anyone reporting anything quite like this. While it has happened to me a number of times - it's only happened to me on one specific road - soI wouldn't have experienced it either if I didn't have this one specific drive.

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[mkhuffman]

I have only had light fantom breaking and only when using cruise control.

IMO your issue does sound like a specific problem with your truck, but maybe that stretch of road creates the perfect scenario that tricks AES and Rivian should use your truck to resolve that edge case. Maybe the best approach is try to get Service to escalate the issue to engineering.

What would be really interesting is to find a Gen2 R1 forum member who lives near you and can drive that stretch with you to see if both trucks freak out. Maybe Service should do that with one of their loaner trucks. Or they can give you a loaner to try on that stretch.

Sorry you are going through this. My wife would be ready to get rid of the truck. She has no patience. Lol.

 

[COdogman]

I would definitely get your truck looked at by service to at least rule out a hardware problem. From your description of the terrain around the road, it does sound possible the weird mix of light/ dark/ steep banks could trick it into triggering, but so many of us have driven on roads like that without incident.

I hope they can get this figured out for you - that would be so frustrating!

 

[McLovin]

I have only had light fantom breaking and only when using cruise control.

I've experienced this as well w/ my Gen 1. But to be fair, I've experienced it w/ pretty much any recent vehicle that has distance-pacing cruise. My wife's A5 does this, as did her previous two A5s, my previous two Audis, and a few rental cars.

I will say that there's a stretch of road on my morning commute that I always get a warning about the conditions, and that I should "stay alert" (can't remember the exact warning). It happens in the exact same spot, every morning, regardless of conditions (it was clear, and 5am, so the sun hadn't even come up yet this morning when it popped up). But...it doesn't do any phantom braking, so I just ignore it...

 

[AlanP]

Yours appears to be much harder breaking than mine but my R1S 2023 has eyes of it's own. 3 lane wide straight road with no vehicles in sight, I'm in the center or left lane and it brakes 2-3 times in the same spots in a 1/2 mile stretch. Drives me nuts as I have to drive this road all the time.
PS only on cruise control.

 

[SwaziCAR]

The only times this has happened to me have been due to (I believe) a shadow cast across a highway by an overpass on a sunny day while I'm using cruise control. If I remember to do so, I turn off automatic braking before driving (but I rarely remember to do so).

 

[R1Tims]

I've had this happen in my G1 R1T. I found it only happened 2x and while I was driving on a 2 lane road and had cruse engaged. I found it happened when I was close to the edge of the right hand side of the road and a large mail box was to the side. This is anecdotal and I do not have quantifiable data to validate.

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