Model X

Sudden and erratic braking on autopilot

edited November -1 in Model X
I have recently encountered a few incidents where my model x suddenly brakes while on auto pilot on the highway with no reason that I can think of.

It mostly happens when a car ahead changes lanes and moves out from the front. My normal distance setting between cars is 5 but I have noticed this at 4 and 3 too. My car brakes even though there is traffic ahead that is continuing to move normally. So for apparently no reason that I can fathom.

I had another scary incident today when my car braked with no change in front. It appeared to me that the autopilot had a false positive and felt someone was changing lanes and coming in front of me. But that wasn’t the case. I was lucky that I was able to disengage auto pilot and get back on speed or I would have been rear ended.

It’s happened erratically and is scary as it occurs on the highway at cruising speed and can lead to a bad accident / getting rear ended.

Has anyone else encountered this.
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Comments

  • edited February 2019
    Is there a fix or setting that anyone is aware of that will fix this. I am on the latest version of the software.
  • edited November -1
    Fix: don't use it.
  • edited February 2019
    Patient: Doctor, it hurts when I do this.
    Doctor: Don't do that.
  • edited February 2019
    I have noticed two new issues with the 2018.50.6 update. 1) Hard braking in AP when passing other vehicles. (AP thinks the vehicles are encroaching on your lane, they are not). 2) when breaking out of AP by turning the steering wheel, the set TACC speed defaults to the actual seed you're traveling, very annoying.
  • edited February 2019
    I have noticed this too. The Tesla does not like adjacent trucks or cars.
  • edited November -1
    Autopilot is not ready for use on the streets, still beta. Tesla offered me a 2 week free trial and did not like it, it did what you describe and more. I even tried to get out of the trial and could not, had to live out the full 2 weeks of trial. If you feel it is dangerous, don’t use it. I have owned 2 Model XS and did not get Autopilot on either one bc I felt AP is not ready for mass use, based on the research I have read, experts agree, and I am super happy with my Tesla vehicles. Best cars I have ever owned.
  • edited February 2019
    Works just fine for me. Does wonders to reduce my stress levels on my work commute.
  • edited February 2019
    It has happened to me one time in the last 10 days. It happened while I was driving on the highway. There was no overpass bridge or anything like that around when it happened.
  • edited March 2019
    This happened to me too, twice in same day. First one I was in a fastrak lane, no cars around, freaked me out. Second time I was on a 5 lane highway, no cars near me. I'm on 2018.50.6
  • edited March 2019
    So, should we press the voice button on the steering wheel and report “bug report- inappropriate breaking on autopilot” so Tesla can pull the logs and see what happened to improve the software?

    Mike P
  • edited November -1
    I have AP 1 that experiences some unnecessary braking in non-interstate traffic when the car ahead moves to to an adjacent lane to make a right or left turn. I know that TACC is not recommended for use on other than limited access highways but I like to use it on local roads so I keep my foot on the accelerator and anticipate the anomalous braking and smooth out the transition by pressing the accelerator. I have not experienced this braking on Interstate highways.
  • edited March 2019
    I have a feeling that this issue, althought it has been present all the time, has become worse after the last update (2019.4.3 on my MX). This happens a lot both on limited access multinlane roads and on regular two-lane highways, in the latter case mostly with oncoming trucks, even though I keep well on my side of the yellow line. Extremely annoying, I am about to get a heart attack every time.
    I was in Germany a couple of weeks ago, and drove a VW Touareg rental. The TACC on that car worked so much more smoothly than my Tesla. Sorry to say so, but most cars at half the price (or less) has much better TACC. If Tesla cannot fix this issue, I hope they at least can give us a setting to switch between TACC and regular dumb cruise control. That´s better than having to keep the foot on the accelerator all the time.
  • edited March 2019
    False positive braking while on AP is just Elon's new approach to keeping drivers "involved!"
  • edited March 2019
    Remember, it's not Full-Self Driving....it's driver assist

    Stay alert at all times!!
  • edited March 2019
    [2019.4.3, MX] I completely agree with inge.lofald. Before the update, it'd happen every once in a while. After the update it's 5-10 times a day. It's absurdly inconvenient and dangerous (mainly for the car behind, of course). Does anyone know if there's a way to recalibrate auto pilot? Perhaps that'd fix the problem for me?
  • edited November -1
    I have found AP sudden braking to be a fairly common occurrence (2019.5.15). Generally happens when I pass a large truck. Once while passing under a bridge with no other cars around and several seemingly random times.
  • edited March 2019
    OP (@rajattaneja) ... Pls specifically identify the firmware version, esp when discussing Autopilot.
  • edited March 2019
    Just got 2019.8.3 and started getting more false alarms on TACC.
  • edited March 2019
    Forgot to add this information. LR M3 RWD
  • edited March 2019
    Yes I have. It started happening after the 2 software updates ago.
  • edited March 2019
    Hopefully 2019.8.4 resolves it.

    Be sure to reboot after it gets installed successfully.
  • edited November -1
    Found the same but the neighboring car is riding the line with my lane.
  • edited November -1
    Been using autopilot for years and never had issues and for the last 2 weeks in getting random hard braking at high soeed (about 5 times in lag week) in highways... I'm starting to get scared engaging ap. It generally feels much more "nervous" since 2018.9.3
  • After the guy got killed in Cali on AP these false positives have increased drastically. And I hate it. What i do is submit a bug report every time this happens. Just push the speech button on the steering wheel and say "Bug report false positive breaking event at freeway speeds". If every one does this the proper attention will be given to this problem. there was an area of I-5 that always did this and after 15-20 reports they fixed this.
  • edited April 2019
    I found on a recent trip that overpasses sometimes caused this to happen. I suspect the software is being overcautious about detecting cross traffic. I still don't care for the automatic lane centering strategy. It takes you off the road and onto exit and entrance lanes. Once it took me to the middle on a 1 to 2 lane expansion and I didn't wait to find out which lane it would decide to use. The car behind me assumed I was headed for the right lane and started to pass. It shouldn't deviate from the stable lane marker more than a few feet imho. Still beta.
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