[kkonstan]

My suspicion is squarely on the auto limiter as this is the only setting I have changed recently: I would be intrigued to know if others who have experienced this issue also had the limiter on - for those who only hired the car they likely won't know as there is no obvious notification that it is in use...

I think this is a reasonable assumption to make. I never used this and never had any problems in >4 years, and use the car just like you described.

Can you even use the auto limiter in conjunction with pilot assist though? I thought it was a case of one or the other.

 

[Thmstec]

hold your horses, the REAR anti collision is TOTALLY another story.
the rear works with the two side traffic detection radars buried at 45° in the rear bumper (for CTA), and with the ultrasonic parking sensors (for RAB).
the CTA works below 15 kmh and the RAB below 10 (again, this is one of the software complication i'd really like to avoid: just make them work below 15 for both, no? i guess they decided those speeds on the base of collisions data...) every time the car is going backwards (even downhill).
the two systems slam the brakes if they consider the collision otherwise inavoidable (and the RAB saved my ass a pair of times... thanks shitty rear visibility.)

anyway, if you floor the accelerator while going bakcwards, the car will give you authority over RAB and CTA...




ok. how long did it travel forward before you slammed the brakes?
ever happened with no one in front of you?



ok.
conditions?

For my 2 instances the car couldn't have traveled more than inches before I put the brakes on.

It's been long enough I can't say I know for certain whether there were cars informing of me both times.

 

[Springbk]

This info is being repeated in

https://www.polestar-forum.com/threads/polestar-2-accelerated-suddenly-and-hit-the-car-in-front.16590/?post_id=288956&nested_view=1&sortby=oldest#post-288956

Can they be combined??

 

[KingArthur]

I think this is a reasonable assumption to make. I never used this and never had any problems in >4 years, and use the car just like you described.

Can you even use the auto limiter in conjunction with pilot assist though? I thought it was a case of one or the other.

I'm pretty sure you can't use the LIMiter at the same time as ACC.

FWIW, conversely, I've never used ACC and have always used the LIM. For the first 6 months or so I used OPD with creep OFF but for the past year or so I've turned OPD off and I no longer fiddle around with the various options, all I do is adjust the LIM depending on where I'm driving (setting it to 20mph is particularly useful in Wales these days!).

Against that background, I've never had the car surge forward. I do have a tendency to keep my foot on the brake pedal when stopped, probably because of previously owning auto-box cars (plus, as mentioned above, it's in the UK highway code to maintain 'control' of the car at all times), but I've never had to use it to prevent a surge forward.

 

[poundsnpence]

I think this is a reasonable assumption to make. I never used this and never had any problems in >4 years, and use the car just like you described.

Can you even use the auto limiter in conjunction with pilot assist though? I thought it was a case of one or the other.

In 3.1.9 auto limiter was added as a separate item in the assist menu. They don't work together as such (limiter doesn't impact set ACC speed) but as soon as you cancel ACC the limiter kicks back in...

 

[poundsnpence]

I'm pretty sure you can't use the LIMiter at the same time as ACC.

FWIW, conversely, I've never used ACC and have always used the LIM. For the first 6 months or so I used OPD with creep OFF but for the past year or so I've turned OPD off and I no longer fiddle around with the various options, all I do is adjust the LIM depending on where I'm driving (setting it to 20mph is particularly useful in Wales these days!).

Against that background, I've never had the car surge forward. I do have a tendency to keep my foot on the brake pedal when stopped, probably because of previously owning auto-box cars (plus, as mentioned above, it's in the UK highway code to maintain 'control' of the car at all times), but I've never had to use it to prevent a surge forward.

Two different systems: I have auto limiter on and pilot as my preferred assistance. Anytime pilot isn't on the auto limiter is.

This is the one that uses the speed sign recognition logic to automatically limit your speed, not the manual limiter you can have as an assistance option where you input the max speed you want to adhere to...

 

[KingArthur]

I was referring to the manual LIM where you set the speed limit using the steering wheel buttons.

I tried the automatic limiter that reads roadsigns but quickly learned that it is not reliable enough for me so I've never used it since.

Actually, all the 'assist' functions have been interesting but after I'd had the car for a few months and settled in to the whole new EV thing I found that I didn't need or want most of them. In retrospect, I could have saved a fair bit of money by not buying the extra packs, but I'll be better informed next time. Not a complaint as such, just an observation.

 

[ians]

I was referring to the manual LIM where you set the speed limit using the steering wheel buttons.

I tried the automatic limiter that reads roadsigns but quickly learned that it is not reliable enough for me so I've never used it since.

Actually, all the 'assist' functions have been interesting but after I'd had the car for a few months and settled in to the whole new EV thing I found that I didn't need or want most of them. In retrospect, I could have saved a fair bit of money by not buying the extra packs, but I'll be better informed next time. Not a complaint as such, just an observation.

Interesting comment. We bought our PS2 3 years ago and I was pretty sure I did not need those features. I drive around in the mountains a lot and they're not too useful I thought. Then we started to drive to the UK too many times and I figured I would have got them if I'd known that. But then again, we drive from here across the Jura, join the autoroute turn on the cruise control and arrive at the the Tunnel. Then we drive slowly in a traffic jam up a lane with potholes I think you call it the M20 or M25.

But I rented some cars with these features over the last couple of months mostly in the UK and they sent me mad. I suspect the Polestar implementation may be better but I need a proper test drive before I'm convinced.

 

[Ed_S]

Are you able to find or share the links to these? I am especailly interested in cases that have been reproducible. I am not saying what you are saying isn't true, but if this really is a defect that can be duplicated as you are saying, there is no way these cars are still on the road and not immediately all recalled.

The last part around people being able to lemon law the car because Volvo acknoweledge the issue but not able to fix it should be front page headline.

I will take a look to find the posts that I referenced, but we're getting ready to head out for vacation and time is getting short, so I may not get around to it for a while.

In the meantime here is the Volvo forum that I was active in from 2021-2024 when I owned the XC40 Recharge. If you do a search on "uninteded acceleration" you will see that there a good number of threads there, some were probably user error, others were repeatable by users under controlled conditions.

Volvo XC40 Recharge Forum

 

[highpks]

So, I've not once experienced anything like this and I never (well almost never) use the brake. OPD standard, creep off. I don't know what that means for those who are experiencing this, or to those of us who aren't for that matter. It does give cause for real concern either way though.

 

[poundsnpence]

So, I've not once experienced anything like this and I never (well almost never) use the brake. OPD standard, creep off. I don't know what that means for those who are experiencing this, or to those of us who aren't for that matter. It does give cause for real concern either way though.

Do you have the auto limiter enabled?

 

[Giove]

anyway, i think this is quite an important thing.
i'll try to replicate the situation with OPD normal and LIM.

on the other hand, OP did not mention LIM... 🤷‍♂️

what about other assistance settings? like "ready to drive", BLISS, collision avoidance...
sometimes these glitches can come unexpectedly sideways...

 

[poundsnpence]

I have everything enabled, collision avoidance late... None of which has been changed in seven months with this car and five in the one before...

I know others haven't mentioned LIM, but maybe they don't realise it's on if they are fairly new to the car. I'm probably clutching at straws but I've been driving in these kind of conditions using the exact same settings for long enough without an issue that the recent enabling of this has to be prime suspect...

 

[highpks]

Do you have the auto limiter enabled?

I do not. Is that even a thing on this side of the pond?

 

[Belac]

I do not. Is that even a thing on this side of the pond?

Nope, we don't get that feature in NA.

 

[poundsnpence]

Probably rules that out as the cause then as I think most of the people reporting issues have been in North America!

 

[Giove]

i've tried today with full OPD and LIM/ACC.
nothing.
still, i get there's a particular feeling on the pedal for the very last 2/3 kmh of braking under OPD, while the system tapers down braking action to not come to a hard stop and passing from regen to friction in at the last moment.
anyway, nothing strange.
brake lights keeps on, the car is steady even on uneven surfaces.

i'll try again tomorrow, but if it's not something reproducible it'll be impossible to take it down...

 

[Thmstec]

i've tried today with full OPD and LIM/ACC.
nothing.
still, i get there's a particular feeling on the pedal for the very last 2/3 kmh of braking under OPD, while the system tapers down braking action to not come to a hard stop and passing from regen to friction in at the last moment.
anyway, nothing strange.
brake lights keeps on, the car is steady even on uneven surfaces.

i'll try again tomorrow, but if it's not something reproducible it'll be impossible to take it down...

Yeah, reproducibility doesn't feel very likely. Again in the two instances I thought this happened--nothing felt out of the usual from the thousands of times i've come to stop at a light or a queue. 95% letting OPD stop the car without having to touch the brake pedal.

I am in the US, so I don't think this ACC/LIM thing applies to me.

 

[Polestar_NoVa]

I was just skimming this thread and it sounds like the same issue that I have experienced 4 times in the last couple months. For 4 years, I always (except when experimenting) have driven with OPD Standard / Creep Off. I rarely keep my foot on the brake (until this started to happen), allowing the OPD to completely stop the car. Like others said, the car suddenly moves forward as if you are gently/moderately pressing the accelerator. It moves forward faster than creep mode would, but not a lurch either. This has happened when the car is stopped on uphill and downhill.

A couple years ago, I left ACC on when following a car onto an exit ramp and allowed my vehicle to come to a complete stop as it followed the other car. When the car in front of me moved, I was startled when my car moved forward in the exact same manner as I'm experiencing now. Except, now I did not have ACC on and every time it happened, there was no car in front of me. I was at a stop sign or the first car at a light.

This is on a 2024 P2 AWD which I leased about 7 months ago. I previously owned a 2021 for 3 1/2 years and never experienced this issue. I now try to keep my foot on the brake when stopped.

 

[poundsnpence]

Interesting... Is there a common thread that this happens specifically on DM cars, and maybe even more specifically on those with the new motors (MY24 on)?