Acceleration out of nowhere

[halseygary]

This was my initial thought as well, but OP said he was pulling into a parking spot and ACC only activates above a certain speed (20mph?). I assumed he was going slower than that.

I've activated ACC in highway traffic when I'm sitting still. So the truck definitely doesn't have to be moving to activate it. I do believe, if remembering correctly, in this case it sets it to 20mph.

It will only activate under 20 if it "sees" another car in front of you. If no car it won't engage. That's what I've seen across the forums.

This sounds plausible, I've not tried to activate it at a standstill without another vehicle in front of me.

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[WSea]

This was my initial thought as well, but OP said he was pulling into a parking spot and ACC only activates above a certain speed (20mph?). I assumed he was going slower than that.

I've set it in stop and go traffic while rolling around 5mph

 

[SDH]

Wow...never knew about this. Thanks for sharing.

To me this is something that Rivian needs to fix ASAP. Surely this is a safety critical issue?

 

[seatosummit]

Just attempted to trigger this behavior in my driveway to no avail. I did not have another car that the vehicle "saw" in front of me, for reference.

 

[Dark-Fx]

To me this is something that Rivian needs to fix ASAP. Surely this is a safety critical issue?

It's not going to smash you through another vehicle if that's what you're asking. It's just turning on adaptive cruise, which is filling the gap.

 

[SDH]

It's not going to smash you through another vehicle if that's what you're asking. It's just turning on adaptive cruise, which is filling the gap.

Oh, my mistake. I thought it was the machine trying to kill us.

 

[usofrob]

I believe this is basically the same behavior that Tesla's have. I haven't really heard of issues with Teslas. But, I know with my Tesla, it accelerates very slowly off the line when using TACC or FSD Beta. I nearly always get a really large gap between me and the normally slow ICE vehicle in front of me. Maybe if Rivian accelerates more strongly, it might seem like it's lurching toward the car in front of you.

 

[av8or]

It will only activate under 20 if it "sees" another car in front of you. If no car it won't engage. That's what I've seen across the forums.

I think this is correct, at least that’s the only time I do it is in stop and go traffic.

 

[cbrcanuck]

I just tested this (no one in front of me) and also couldn’t get it to move.

 

[ksujeff99]

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.

 

[1T2022]

this is bizarre and DANGEROUS. It might hit something.

 

[Whale Blubber]

But if it's the ACC switching on, then it should only be lurching forward if it can fill a gap if it is working as designed -- i.e., if there's something that can be hit in front of you, the ACC should see that and stop accelerating before contact with whatever space the ACC is set to, just as it does in ordinary on-highway use, right? It's unclear to me if that's what OP experienced, or if in fact there was no room in front of OP to be filled by the ACC.

 

[Riviot]

But if it's the ACC switching on, then it should only be lurching forward if it can fill a gap if it is working as designed -- i.e., if there's something that can be hit in front of you, the ACC should see that and stop accelerating before contact with whatever space the ACC is set to, just as it does in ordinary on-highway use, right? It's unclear to me if that's what OP experienced, or if in fact there was no room in front of OP to be filled by the ACC.

It is ACC, it does work in parking lots (other cars sensed, just like stop and go traffic), and it'll fill the gap you have set in the 1-4 lines distance. Ever set it to the closest line in traffic and feel like it's slamming the brakes? That's as designed. I set it to the furthest line when I see brake lights ahead and slowly move to closest as it slows down.

 

[Marchin_MTB]

Oh, my mistake. I thought it was the machine trying to kill us.

Intent is important. It’s not trying to kill you, it just want you to know that it can.

 

[R1Thor]

Skynet is becoming self aware...

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