Gen5 Prime suffers from phantom brake syndrome.

What kind of a road were you driving on? If driving on a two lane road, that would be your issue. Only to be used on divided freeways.

 

Twice. Both times with AdaptiveCC running.

I forget the conditions the first time but it was on a sparsely populated 3 lane highway.

Second time was in town, 2 lane one-way road where the right lane had additional space for parked cars. I was biased towards the center line so there was absolutely no way I'd even come close to clipping a parked car. But as the first parked car got nearer ACC did a pretty harsh slow down as if I was going to hit it. I overrode it by hitting gas quickly after.

ACC is not perfect and I'm still always foot ready to touch either pedal depending on conditions.

 

I thought that my car was experiencing phantom braking because it slowed down often while driving down my narrow residential street. It did that in the same place most every time. I was wrong.

The real problem was that the leaves had fallen from the trees that were planted in the center divide. There was a fairly new "Children crossing" sign to my left that had been hidden in the foliage from the day that it was installed last spring. And that's what the car was responding to. It was obeying the warning sign in an area where the vision was obscured and I tended to drive a couple miles per hour above the limit.

I have also had the car hit the brakes in response to cars coming to a near stop in order to turn right into a driveway. That's the expected behavior so it is NOT phantom braking. Besides, the instructions instruct us not to use smart cruise control in town.

 

7 or 8yrs ago - tesla sales #'s began to increase significantly. That's where the Phantom breaking phenomena seem to first become significant. It's a part of our Pacifica dynamic now as well. It's mostly noticed on narrow curving roads with occasional cars parked along the road. Better phantoms than total blindness.
Welcome to the party

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My best guess is that there was something ahead of you on the road that happened to trick the camera into thinking there was a car. The light hitting the lens a certain way for example, or shining off something like a road sign in the distance that had the car interpret it as a vehicle.

The worst I get is when cars are parked on the side of the road, around a bend, and the car's precollission system applies brake power thinking I'm approaching another car and won't be making a turn.

 

Yeah, that's why I disabled most of these "safety" features.

 

None on my RAV4 Prime (so I won't answer the poll), though I've rolled up only 7k miles so far, not much of a sample. And I do use DRCC on undivided two-lane highways.

 

Could something like a moth have triggered your collision sensor? My proximity alarm will go off when I'm in tall grass.

 

Exactly, we should not confuse the traditional Tesla phantom breaking where the car starts braking suddenly on an otherwise empty road with the oversensitive braking with TSS 3.0

Personally I had never phantom breaking but the car did quite alot of brakings because it thought I might hit something which was actually outside of my driving trajectory. I use the crusie control most of the time though in many conditions - even in cities.

On reason I think TSS 3.0 is more sensitve compared to older systems is because it has an extra wide front radar and scans more of the left and right as well.