My wife said she was in the parking lot today, pulling into a spot, when the car suddenly accelerated on its own. She was not on the brake or throttle at the time. She had to slam on the brakes Anyone experience this before?

 

Was the floormat sticking?

 

No, not possible for it to be the floor mat.

 

No.. never had that issue. Did she press the adaptive cruise button on the steering wheel? by default it will set the speed to 35km/h and will auto accelerate. By pressing the brake, it will cancel it and you won't know if happened.

 

Good question. I know very little about this car as I never drive it, but that seems like a dangerous feature. I will look into it. Thanks.

 

Mine did similar. I stated earlier the cruise control set up is confusing/not driver friendly

 

What if anything was in front of her?

 

Very possible. If adaptive cruise was used during the drive, pressing the foot brake or cancel button does not eliminate the memorized speed. As soon as one press the adaptive cruise button again, the NX will go full on acceleration to reach that set cruise speed.

The only way to complete eliminate the memorized speed is to change the cruise control mode from adaptive to regular.
I think it's an oversight by Lexus on this.

 

It's more than that.. even without the memorized speed, just pressing the adaptive cruise button, if you are under 35km/h, it will set it to 35km/h and start accelerating to 35km/h.

 

Just tried it last night, you are right. But my NX sets the speed to 30km/hr when I just let the car roll in Drive and press the adaptive cruise button.

I foresee many future NX users complaining to dealers that this car self accelerates but in fact it's by design that pressing the adaptive cruise button in Drive does that. (Maybe when enough people complaint, a software update will correct this.)

I wonder if the new RX does the same thing.

 

You are right.. it's 30km/h. Just answering on top of my head .. I remembered it was 3x km/h. It's a double edge sword, if they make it harder to turn on the adaptive cruise then you will have others complaining that it's so hard to activate it. But we don't know if that was the case that cause the auto acceleration. It sounds and could be possible, but can't rule other options out as well.

The RX, TX would all be the same.

 

I will agree with you on one thing, the thread starters wife could have accidently hit the ACC button.
I have a 2019 Corvette, 2020 BMW X6, 2022 Honda Ridgeline and none of them will auto accelerate when the ACC button is pushed----------------that's the way it should be. MY Wife's NX will auto accelerate and I find this to be unnecessary, more tech overkill and very dangerous. What good does auto accelerate to 30 or 35 MPH do if it will engage accidently except possibly cause an accident, you still have to accelerate using the accelerator to reach your desired speed (unless your going to travel on I-95 at 35 MPH). I would think the NHTSA (in the USA) would find this unacceptable and I intend to advise them of the "auto accelerate" function on the 2022 - 2024 NX, 2023 - 2024 RX and possibly other Toyota/Lexus models.
ACC has been around for several years, accelerating to your desired speed and pushing the ACC button does not make it "hard to activate", did you think CC was hard to activate for the many years prior to ACC?
ACC and CC are made for highway use, not around town in stop and go traffic, that's why ACC is designed to activate above 30 - 35 MPH-----------------except on select Lexus models.

 

I don't know what the MPH in the US is when you don't have it set. But for Canada it's 30km/hr and not 30 MPH. I tried it and it's not really that fast, but it will accelerate slow to 30 km/hr.

 

Fortunately nothing.

Thanks for the responses. At this point, she is not certain whether she could have hit the button, but there is probably no other plausible explanation, other than some type of malfunction with the car. We'll just keep an eye on it.

 

Just tried it, it's 19MPH. Yes, the car will accelerate if you are below it.