Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.
Register

PSA: CAREFUL--Autopilot sudden braking

dhu1

Member
Mar 9, 2017
816
604
Berkeley
I know there are other threads about this. But I think it is serious enough flaw in AP, that I think everybody should be careful (Trust me, I am not a short seller. I own 3 Teslas).

Situation: When autopilot is engaged, it somehow sees some shadows/images, and it brakes pretty hard even though no car is in front of you. It does not come to complete stop, but it will go from 65-70 to 45 pretty quickly.

Conditions: Typically for me it has been driving in the dark (evening or early morning) and going under an underpass. I am not sure if others have seen this during the daytime or other conditions.

Please take notice of this and be careful when engaging autopilot. I have already been rear-ended (not related to this issue), but I can see how this bug can create a hazardous situation where somebody behind could rear end you.

I hope Tesla takes note of this and fixes it soon....it can be fairly dangerous. In the meantime, I have taken to driving again without autopilot until the next update.
 

vkathuria

Member
Jan 9, 2017
43
33
Palo Alto
Yeah, I have noticed this too - it takes you by surprise the first time it happens. Now when I see a similar situation, I hover my foot over accelerator in case I need to press it to maintain speed.
 
  • Funny
Reactions: jimmyjohn

rhaekar

Member
Nov 9, 2017
455
367
San Diego
It just happened to me today when I went under an overpass. The GPS based speed thought I was suddenly off the freeway and on the surface street overpass and said limited autosteer speed to 45. Luckily I had my foot on the accelerator so I could override it but it just jolt me a bit trying to slow down.

This is on 2018.14.13, never had a problem with this on the previous versions.
 

GoneCrazy

Member
Feb 7, 2018
155
167
TX
Interesting, I have now had this happen to me twice. The first time was Friday, on a wide open freeway with no cars around. Hard brake. It was a pretty jarring event. The second time was this morning, and it occurred during heavy traffic when suddenly a gap opened in front of me. Car started to accelerate and then hard brake despite still being well further than my follow distance from the next car.

Not sure what triggered the false positives. Didn't happen to see if my car showed a phantom car on screen. Now that it's happened to me twice, I won't be in a panicked state, and do plan on submitting a bug report over voice command immediately for any future instances.
 
  • Informative
Reactions: chibi_kurochan

JHuberman

Member
Dec 28, 2016
140
149
Raleigh
It has happened to me both in the MS and M3. Usually for me it is when a car is pulling out of my lane and moving into a turn lane and slowing down. It is pretty consistent. I haven't had a problem with overpasses in many months.
 
  • Like
Reactions: vernontwg

Nurkbonis

Member
Feb 17, 2018
272
931
Portland
I've had it happen a few times as well. It seems like a few of the times it has happened it might have been when a car in front of my car changed lanes, and then at the last second, my model 3 perhaps views the car that is now mostly out of my lane as some sort of obstruction. The car that was changing lanes never tried to re-enter my lane, but this scenario has happened more than once. It's possible some other environmental object (shadow, overpass, etc.) was coming into play, but I can't say for certain.
 
  • Like
Reactions: EkBuZ
Jan 20, 2017
560
413
San Jose, CA
Happened to our Model 3 several times too. Did not realize until this thread that it was potentially due to the overpass.
The most recent one was yesterday driving on 880S under Coleman overpass. At first i thought it was due to the dip on the road and ultrasonic/radar thought it about to crash to the "road".

Google Maps
 
Jan 20, 2017
560
413
San Jose, CA
Should add a poll, this looks like a recurring large scale bug.

FYI, i'm on 2018.14.13
Everyone report this to Tesla Roadside right away or leave the Voice Note using the car's voice command.
 

David29

Supporting Member
Supporting Member
Aug 1, 2015
2,257
1,909
DEDHAM, MA
I had this happen recently in my AP1 Model S. there had been a rash of this behavior a year or more ago, after a certain software release. I have not searched for the thread. But as I recall, the understanding then was that Tesla had a database of things like bridges, and the braking meant that the database was incomplete. So folks were told to file a bug report ASAP after the incident so that Tesla could fix the data.

Whether or not that understanding was true, i have no idea. But I went for many months, maybe a year, without seeing any incidents. Very sorry that they are back again....
 
  • Helpful
Reactions: RBowen and TaoJones

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


SUPPORT TMC
Top