Model S

Service Bulletin - Replace 4 Lower Control Arms

edited February 2014 in Model S
So I had a flat today and had my P85 flat bedded to the SC for new tires. However, they also changed my 4 lower control arms to much stiffer lower control arms as part of a service bulletin (i.e. for free). Not sure if they gave me the P85+ lower control arms, but my car is definitely handling much much better. It just feels much more controlled in turns. I guess the new tires may be part of it, but I think it is mostly the stiffer lower arms.

The new arms were Part "NUT HFPT M14x1.50 [10] ZnAl-W (1004358-00-B)". Anyone know if this is the P85+ lower control arms?

So here is a great example of the car getting better with new hardware, almost 1 year after getting the car. Wow!!! I love Tesla!!!

Comments

  • edited November -1
    I had my annual service two weeks ago and they did the same service bulletin - steering is much more precise now. So far my car has seen service three times and every time I got a much car back - love it.
  • edited November -1
    ...much better car back - love it.
  • edited November -1
    Btw - no new tires here.
  • edited November -1
    "NUT HFPT M14x1.50 [10]"

    If I'm deciphering this correctly, they replaced 10x nuts, not the control arms? M14x1.50 is the thread spec, Metric 14mm with a 1.5 pitch.
  • edited November -1
    mstrobl2 has it correct. Those are bolt/nut specs.
  • edited November -1
    I replaced my Feb. delivery P85 with a July delivery P+. We then got my wife's S85 coil in September and I was amazed at just how good it felt. I then went to order P+ rear lower control arms for the car and learned that (1) the stiffer bushing LCA were originally shipped in the P+ and (2) they were then migrated to ALL production. My wife's car already had the stiffer P+ LCAs as did all current production.

    Now for the idea that any car company would upgrade the LCAs to better performing units for free with any safety related recall, all I can say is Tesla just put a serious set of teeth behind their assertions of the worlds best service. I could car less about fancy music and cappuccino machines in the posh waiting room. Give me new LCAs that dramatically affect the quality of the car I purchased and you have my attention.

    Thanks again Tesla for doing the smart thing.
  • edited November -1
    Could you please list the part number of all the control arms so we can see which front ones (or other two rears) were replaced?
  • edited November -1
    I had a similar service bulletin and mine was a P 85+ to start with. My understanding was that it was an upgraded locking nut perhaps to address a loosening issue. I doubt it made the car drive any differently.
    Documented in work order as "new control arm lock washers and nuts, see related bulletin".
  • edited November -1
    I guess the uprated arms were too good to be true.
  • edited November -1
    Further detail from my experience:

    Concern: Front Lower Control Arm Washer Installation

    Cause: Service Action (Bulletin)

    Correction: Inspect Knuckle/Ball Joint Surfaces, Install 4 Front Lower Control Arm

    Washers

    Inspect Knuckle/Ball Joint Surfaces, Install 4 Front Lower Control Arm Washers.

    Part Qty

    NUT HFPT M14x1.50 [10] ZnAl-W (1004358-

    00-B)

    WASHER, NORDLOCK, 15.2x30.7x3.4

    (1033093-00-A)

    4.00

    4.00

    Pay Type: Warranty
  • edited November -1
    My part numbers are the same as Bighorn's but 'Concern' and 'Correction' are different . The 'Correction' says "Replace 4 Lower Control Arms" as well as "Install 4 Front Lower Control Arm Washers". Confusing.


    Concern: Front Lower Control Arm Washer Installation

    Cause: Service Action (Bulletin)

    Correction: Replace 4 Lower Control Arms, Install 4 Front Lower Control Arm Washers

    Part Qty

    NUT HFPT M14x1.50 [10] ZnAl-W (1004358-00-B) 4.00

    WASHER, NORDLOCK, 15.2x30.7x3.4(1033093-00-A) 4.0
  • edited November -1
    I too had the same washers replaced. My steering wheel was making a squeaking noise at low speed and that went away after the service. Also whenever I am making a u-turn I can hear a mechanical pop or sliding noise coming from the front. Also gone after those repairs.
  • edited November -1
    @mdemetri
    I had remarked to the service center that I'd heard a very rare clunk when backing out of head-in parking. Perhaps that is why they noted the inspection. My recollection is that they replaced more than just washers, but it's not reflected in the service order--maybe the control arms are threaded differently now? Funny that your parts break-out doesn't mention control arms either.
  • edited November -1
    I had no complaints at the service, here is what my order says...

    Concern: Front Lower Control Arm Washer Installation Cause: per Bulletin
    Correction: Inspect Knuckle/Ball Joint Surfaces, Install 4 Front Lower Control Arm Washers
    Inspected Knuckle/Ball Joint Surfaces, Install 4 Front Lower Control Arm Washers per bulletin
    Part Qty
    NUT HFPT M14x1.50 [10] ZnAl-W (1004358- 4.00 00-B)
    WASHER, NORDLOCK, 15.2x30.7x3.4 4.00 (1033093-00-A)
  • edited November -1
    The inspect joint surfaces could explain why some people had arms replaced while others did not. If damaged, they replaced else just do the washers to prevent a known issue from occurring.

    So much for my pie in the sky change out the lower a-arms to make older cars handle better theory. It was good while it lasted.
  • edited November -1
    Lola - I think your right about why some arms were replaced while others were not. But I think your theory about upgrade still may have some merit. Something on my car was upgraded, which I assume is the arms, as the SC told me that the change would make the suspension stiffer/stronger, going from 90 to 120 (not sure of the units). So maybe if the arms were damaged by the known washer issue, they upgrade the arms as well, otherwise just the washers/nuts.
  • edited November -1
    Interesting. I swear my car's handling has been getting better the longer I drive it. I chalked it up to just getting used to the car, but maybe this has more to do with it (I have had several upgrades through service).
  • BIGHORN "heard a very rare clunk"….this has happened to me twice -- both times a day after I washed the car. I think the brake pads stick to the disc if parked wet, and the clunk is the pads breaking loose the next time the car is moved. Does no harm. Not a problem.
  • edited November -1
    @jerry
    I'm familiar with the parking brake freezing clunk in back. At least one of my clunk situations happened after the car was moving, so I don't think it was the pad/rotor binding that time. Ranger seemed to think it was the control arm. Thanks for the suggestion.
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