Acceleration out of nowhere

[JMACCA]

You activated cruise control... so the car was accelerating to the set speed. Pulling down on the "shifter stock" while in "D" activates cruise control.
Do it a second time and you activate Driver+. Rivian needs to lock out CC activation below 5 MPH.

IF CRUISE CONTROL WERE TO BE INACTIVE BELOW 5 MPH, IT WOULD BE USELESS ON BUSY SO CAL FREEWAYS DURING RUSH HOUR....I THINK WE JUST NEED TO LEARN HOW THE VEHICLE WORKS. CC IS INACTIVATED AS SOON AS THE BRAKE IS TOUCHED, IF IT IS RE-ENNGAGED THE NEW SET SPEED IS THE VEHICLES CURRENT SPEED.

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[NY_Rob]

What happened here and how do I stop it from happening again?

I was stopped about to pull into a parking spot, but not in park. I’m nearly certain in Drive. I believe I then shifted the right hand side gear to D again(?) and the car then starts accelerating aggressively toward another car. I slammed on the brakes. What did I turn on?? I didn’t place a foot on the accelerator.

Seems like the OP activated the ACC while pulling in to a parking spot, the system "saw" another vehicle (or something else) in front of it.. and tried to make up the gap between them to the 1-4 car length preset by the vehicle owner?

 

[gregtay]

I really hope it doesn't, but if it does happen again, be sure to capture logs and a timestamp (long press your name on the center screen) and report it to Rivian.

I believe the scenario might be... you are using CC... you pull off the highway and start parking. Pulling down reactivates CC. w

IF CRUISE CONTROL WERE TO BE INACTIVE BELOW 5 MPH, IT WOULD BE USELESS ON BUSY SO CAL FREEWAYS DURING RUSH HOUR....I THINK WE JUST NEED TO LEARN HOW THE VEHICLE WORKS. CC IS INACTIVATED AS SOON AS THE BRAKE IS TOUCHED, IF IT IS RE-ENNGAGED THE NEW SET SPEED IS THE VEHICLES CURRENT SPEED.

i will use all lowercase to counter your uppercase. i did not mean that cc didn't work below 5mph... as you said, you need it to work in stop and go traffic. but locking out the 'activation' (tapping the stock down) under 5 mph would be fine. no one is at a stop in traffic and decides to activate cc. and isn't the min cc set speed 20mph?(meaning if I am going 5mph and i set cc on... the set speed is 20, not 5) (i could be wrong)

 

[Dark-Fx]

. no one is at a stop in traffic and decides to activate cc. and isn't the min cc set speed 20mph?(meaning if I am going 5mph and i set cc on... the set speed is 20, not 5) (i could be wrong)

I'll do it if I'm in completely stopped freeway traffic and need to look away from the road for a second. The vehicle will start moving and draw my attention to traffic starting back up. I won't do it in places where there could be pedestrians or other types of road users though.

In my brief testing last night, you can't activate cruise below 20 mph if it doesn't detect other traffic. It just says it's unavailable right now. The road I tested it on doesn't have lane markings, but I don't think that it matters.

 

[gregtay]

I reported this to Rivian in early 2023. For me it happened in the elementary school drop off line. Scared the **** out of me and prompted me to call the school principal later to apologize and tell him it wasn’t me purposefully accelerating like a banshee once I’d dropped off my kids.

To Rivian’s credit, they took me seriously when I submitted the ticket. I messaged with Wassym on Reddit and had at least 5 follow-up phone calls with Rivian service.

In the end, I don’t know if they fixed it or not. Their original response was to claim it was “working as designed” and then justified it with a bunch of engineering speak. Later their tune changed a bit and they were able to reproduce the issue. To be clear, I do think they really looked into this and made an effort to solve it. I hope the fix is coming in a future update.

The last conversation I had with Rivian about this was on July 28 so it’s probable that the fix is still in the pipeline for a future release.

The fact that they were able to reproduce it speaks volumes. I am sure it was a bit of an "oh crap" moment when they did have it activate the same way you and I did and they realized it is possible for this to happen.

I only had it happen once (about two weeks ago), and it was quick scary moment (I slammed on the brakes before I got too close to a parked car) and originally figured i was doing something wrong with the pedals, but I saw ACC light up on the dash so i quickly realized that my action of pulling down on the stock (while already in D) I had activated ACC and the car was responding to that action. Sort of forgot about it till your post.

 

[Whale Blubber]

Yeah I once had something similar happen as I was approaching a line of cars at a stop light while slowing down. I forgot I had previously set it to like 20-25 or so in a school zone and had accelerated afterward without ever hitting the brakes. And since you don't have to brake to slow down with 1-pedal driving, it stopped slowing when it dipped down to whatever speed it was previously set to. It was kind of alarming, as I had forgotten about ACC being on, but it wasn't "dangerous" per se, in that it would have stopped once it closed the applicable distance. Nonetheless, it did startle me enough that I slammed on my brake pedal, which was probably more dangerous than just tapping it to disengage.

 

[Craigins]

I just tested a few different scenarios.

From Hold, I was not able to engage ACC.

With the speedometer reading 0 instead of hold, I was able to engage ACC.

ACC engaged and moved the vehicle to the set distance to the parked car in front of me.

So i think this issue has a few layers.

1. Use the brake when shifting "gears" and you won't have surprises.

2. People panic when something unexpected happens, and the panic can compound issues (ie accidentally hitting the accelerator instead of brake)

Since they use the stalk for multiple purposes, they should require the brake to be used for shifting.

 

[JMACCA]

I believe the scenario might be... you are using CC... you pull off the highway and start parking. Pulling down reactivates CC. w

i will use all lowercase to counter your uppercase. i did not mean that cc didn't work below 5mph... as you said, you need it to work in stop and go traffic. but locking out the 'activation' (tapping the stock down) under 5 mph would be fine. no one is at a stop in traffic and decides to activate cc. and isn't the min cc set speed 20mph?(meaning if I am going 5mph and i set cc on... the set speed is 20, not 5) (i could be wrong)

You are correct.

 

[HaveBlue]

I think the hazard lies in the multifunction. It's different from any other car I know of. Dropping your kids off at school in a line and accidently hitting the shifter again is very realistic. The car closing the gap between the next car and a bunch of kids running in between is a recipe of sorts.

I was sitting in the pick up lane at LAX one day and a guy left his wife with the car to look for whomever he was picking up. A cop told the woman to move the car because she couldn't park there. She pretty much panicked while furiously trying to get the car into drive. "OMG OMG OMG" was all that went through my head as she pushed the gas harder and harder trying to get out of park. She finally did and smashed right into the car in front. Luckily there was no one standing between the two cars.

 

[Krs71]

SO not sure this is similiar but it's happened twice to me so far, I'm cruising to a stop light with my foot gentle on the peddle to keep going to the light and sudden the car accelerates and I didn't activate anything, anyone experience the same?

 

[Zoidz]

SO not sure this is similiar but it's happened twice to me so far, I'm cruising to a stop light with my foot gentle on the peddle to keep going to the light and sudden the car accelerates and I didn't activate anything, anyone experience the same?

Any chance you had Adaptive Cruise Control activated and the vehicle in front of you accellerated, causing you to accellerate?

 

[Dark-Fx]

Any chance you had Adaptive Cruise Control activated and the vehicle in front of you accellerated, causing you to accellerate?

It is a pretty jarring when adaptive cruise suddenly takes back over, as the acceleration change is harsh. Seems like it's probably intentional though, so you realise it's happening.

 

[Krs71]

Any chance you had Adaptive Cruise Control activated and the vehicle in front of you accellerated, causing you to accellerate?

Not that I know of, Usually don't touch the stalk once I'm in drive unless parking....

 

[Hillbilly]

Man I love cruise control and driver+ in stop and go traffic. It's awesome

 

[trez63]

You activated cruise control... so the car was accelerating to the set speed. Pulling down on the "shifter stock" while in "D" activates cruise control.
Do it a second time and you activate Driver+. Rivian needs to lock out CC activation below 5 MPH.

Exactly this. It has happened to me and I really think they can avoid this easily with a software update. You shouldn't be able to set a cruising speed if you're going less than 20mph.

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