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Pulsating at low speeds

Discussion in 'Model X' started by Coldones, Mar 25, 2020.

  1. Coldones

    Coldones Member

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    Location:
    Otsego, MN
    I picked up a Long Range Plus a few weeks ago. This is in addition to my Model 3 Performance that I've been very happy with. Unfortunately, we're off to a rough start with some quality issues on the X. It has a born on date of 2/20/20, so it's pretty new off the assembly line. I've already had it in for service twice, with some unresolved concerns.

    When decelerating at a very low speed, (from 3 to 0 mph) the vehicle shakes a little. On my initial service visit, they thought the rear drive unit was bad and were supposed to order a replacement. However, when I brought back in for the second visit to replace the rear drive unit, they said this is a 'known issue' and that a future firmware update will correct it. They also mentioned the that rear drive units on the X have been 'revised' very recently and are now supposed to be stronger. I just looked in the parts catalog, but didn't see any new revisions for the rear drive unit.

    Does anyone else with a recently delivered Long Range Plus experience this pulsating shake at low speeds when you're coming to a stop using regen? None of the demo units that we test drove had this behavior, though maybe they had one of the older drive units?

    Other issues I'm working through:
    • The drivers front door never auto opened from day one. They replaced the antenna and Body Control module and now it seems to be working fine.
    • The front camera is very blurry on the bottom half of the sentry videos. They claim this is 'normal' for the X, because the location of the camera picks up the bottom of the camera housing. I don't have another X to compare against, but the image from the front camera on my Model 3 is crystal clear.
    • They have to replace my center console due to a small chunk of flock (black fabric) missing. Looks like it was damaged during installation at the factory.
     
    • Informative x 1
  2. CuriousM3

    CuriousM3 Member

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    Los Angeles
    I have the same issue, i get this wierd clunk thats shakes the rear end on slow speeds when decelerating at low speeds or tapping the accelerator. Feels like a loose motor mount. They replaced my drive unit, axels, and tires and kept the car for 3 weeks while testing and working with fremont engineers. In the end it was the same and said to wait for future fix as it now a known issue. The temporary resolution is to not use the hold function and use roll or creep to lessen the clunk. They also mentioned the rear motor of the raven was an updated design to my surprise, since all i read about was the update to the front motor.

    The clunk happend so often that i never used hold mode again which sucks bc one pedal driving was great and we never had an issue like this on our previous non raven P100D X and Model 3 long range.

    Yesterday I updated the X after getting it back from service to 2020.8.2 with the stronger regen and tried turning hold mode back on, and it was a lot less clunk frequency than before. So i think the issue is regen braking blending into the caliper braking and maybe software can fix it or maybe an issue with the caliper and a loose brake pad? Not sure but it feels like it’s something within those 2 braking system.
     
    • Helpful x 1
  3. mswlogo

    mswlogo Well-Known Member

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    I only recently switched to Hold mode in the last month or so on my Fall 2019 Raven X.

    But for reference No Clunks or Pulsing when rolling to a stop. Running 2020.8.1
     
    • Informative x 1
  4. Coldones

    Coldones Member

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    Thanks for the reply. I'm surprised that this isn't a broader topic on these forums. I would assume if it's "known issue" that all new deliveries of Long Range Plus X's would be experiencing the same. Could be that some people who don't previously own a Tesla think it's just normal.
     
  5. CuriousM3

    CuriousM3 Member

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    #5 CuriousM3, Mar 26, 2020
    Last edited: Mar 26, 2020
    Service told me they are starting to see more of it for the X for the rear end. On the S they said they see this issue on the front end

    Glad to hear not everyone has this issue, and some might not even notice bc its their first X and think its normal ? I owned a previous non raven X plus the loaner X while my X was in the shop, and none of them had this wierd clunking at low speed. If you floor it or accelerate smooth and firm, no issue. If you tap on it while in traffic or trying to park, it clunks since those are low speed scenarios

    Have you tried creep mode to see if that reduces the shaking/clunking? Curious if that works for you too?
     
  6. Coldones

    Coldones Member

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    Using creep mode mitigates the shaking when coming to a stop. However, I still feel it when accelerating at slow speeds. It's extremely noticeable when driving on an incline that adds additional resistance to the motor, such as backing into my garage.
     
  7. CuriousM3

    CuriousM3 Member

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    Let me know if they find a solution for you. Have a couple of due bills and this is one of them when they find a solution?
     
  8. Uncle Paul

    Uncle Paul Active Member

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    Sounds like it is not a hardware thing, but software. They recently added full one pedal driving with a full stop and hill hold at the end, and also recently increased the amount of regeneration braking to add efficiency/range. Maybe they need to do just a little tweeking to smooth out the last couple feet of stopping.
     
    • Like x 1
  9. MattUNI

    MattUNI Member

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    Phoenix
    I also just received a 2/20 manufactured MX, but I have not noticed any shaking, and I exclusively have it in Hold mode (fingers crossed). Coincidentally, I also have a Model 3.
     
    • Informative x 1
  10. CuriousM3

    CuriousM3 Member

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    Yeah the Hold mode on the 3 is smooth, you do hear a slight mechanical caliper click but it’s very faint and don’t hear it with the radio on.

    Update to 2020.8.2 seems to have help, my guess is it’s something in the regen braking aggressiveness since the update has help it. And if it is software related, even better since that can be fixed without going back to Tesla
     

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