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P85D Rear Drive Unit failure

Discussion in 'Model S' started by mindsweeper, Jan 19, 2016.

  1. mindsweeper

    mindsweeper Member

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    Last Friday I took my P85D to our vacation house, supercharged as planned before arriving while shopping for the weekend. It was cold, -10C (14F) driving up there.

    Had to get the snowblower out as we had 1ft snow on arrival.

    Saturday morning was a little colder, but we had some fun in the snow with the kids, and it started to snow at night.

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    Later at night it started to get really cold, we saw -18 (0F) and according to my weather station it was as low as -22 (-7.6F) during night.

    IMG_1632.JPG

    Now. Here is where the excitement starts, Sunday morning I need to go for a ride, and start preheat from my iphone. Nothing out of the ordinary until I check the app, and see that the car is not pulling any current even though being plugged in. So I look outside and notice a small greenish color behind the right rear wheel.

    image1.JPG

    Car tells me it is low on coolant (no **** Sherlock)

    image2.JPG

    So, I call Tesla - they say a flatbed will pick it up.

    image3.JPG

    And I am stuck with what is probably the most boring loaner anyone ever had

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    But, just over 2 days later, new DU is installed, car is cleaned inside and out at no cost

    FullSizeRender.jpg image6.JPG

    Really happy with the way Tesla fixed this, they really went the extra mile. Service guy called me several times asking if all was ok and if I made it home without the car. Then picking up a clean car was just delightful.

    But, how many other P85D had a DU replacement? The service center told me they had never seen this failure before, and I havent really heard abou any other D´s with DU replacements at all
     
  2. jeffro01

    jeffro01 Active Member

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    Good stuff but... I have to ask, the snowflake icon next to the battery level in one of the shots, is this "new" and at what temperature does it display??? :)

    Jeff
     
  3. 3mp_kwh

    3mp_kwh Member

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    You've been "greenwashed".
     
  4. Todd Burch

    Todd Burch Electron Pilot

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    This is a really rare failure as far as I can tell. Seems like a coolant hose burst or leaked. Perhaps some water got into the system, expanded when it froze, and caused a leak?
     
  5. DougH

    DougH Active Member

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    That snow is really pretty. I wish we got snow like that in Oregon.
     
  6. apacheguy

    apacheguy Sig 255, VIN 320

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    Been there since 4.x but the implementation changed due to the UI refresh. I've never seen it myself.
     
  7. Electric700

    Electric700 Member

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    I'm sorry this happened but glad to see they fixed the issue quickly for you.

    The water intrusion and expansion theory seems to be plausible. I expect the service center would have more details, and they will probably be sending the old drive unit to the factory for a more thorough analysis.
     
  8. tcampos

    tcampos Member

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    I just had BOTH of my drive units replaced. My problem started off as a 12V battery problem. I had to have the car towed into the service center. It took them 3 days to decide to replace the rear unit - apparently because it was leaking. Then after they replaced it they decided to replace the front unit because that was the source of the 12V issue. 2 weeks later I got my car back.

    This is my 2nd Tesla and I have to say service did a pretty good job keeping me informed. However, why I had to replace BOTH drive units for a 1 year old car with 12.5k miles on it is way beyond me.
     
  9. tomas

    tomas Traded in 9 rep bars for M3, used to be somebody!

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    Tesla has decided to centralize most DU repairs for now. So, they replace and then send back to remanufacture unit, and it is dispatched as replacement for someone else. Thus, it is hard to know the exact severity of each repair that is needed. Using ICE analogy, you might have had something as insignificant as a timing belt adjustment, or as significant as a valve job. This whole "DU failed" discussion certainly gets people nervous because they jump to "geez, engine failed, needed to replace the whole thing". Because specific knowledge of each problem is opaque to owner, you can assume the worst or the best. As long as Tesla is paying for all severity via warranty, this is really a minor issue. Question is: what range of repairs will eventually be done at Service Centers at a reasonable cost, and what proportion of repairs does that cover?
     
  10. CuriousG

    CuriousG Member

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    They they give you brand new DUs or were they remanufactured?
     
  11. steph280

    steph280 Member

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    It's all fine and dandy they replace the DU now. But what if we were stuck with the replacement bill after warranty expires? This can't be a cheap thing to replace, refurb or not.
     
  12. tomas

    tomas Traded in 9 rep bars for M3, used to be somebody!

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    Plz read post 2 up. Thx. Don't panic yet.
     
  13. Uncle Paul

    Uncle Paul Member

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    The drive unit may not have failed at all. Maybe just a hose or loose connection.

    Tesla elected to take out the entire unit rather than just tighten up a loose connector out of an abundance of caution.

    The probably want the entire unit to determine exactly what went wrong, and gave you a rental and new drive unit to optimize your service experience.

    Instead of a headline saying drive unit failure, perhaps it should have said Excellent service from Tesla Motors on a sub freezing night.
     
  14. mindsweeper

    mindsweeper Member

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    That was my thought as well, but since all the coolant was still very fluid I am wondering why that water would not have been mixed with glycol anyway.

    Could it be condensation in the DU?


    According to the SC, the DU had a crack in it. So definitely a failed DU as I see it, even if not with grinding noises as is the "normal" DU failure. Up to the coolant spillage my DU has performed perfect with no sounds, clanks or anything for 10 months and 17k km.

    But yes, I agree with you - the title could be different, because Tesla really did go out of its lengths to help me and very swiftly so. I received four phone calls from the support center after my initial call where they just wanted to 1. inform me that a flatbed was on its way, 2. check if the flatbed had picked up the car and that it went as planned, 3. to check again if I was really ok getting home without a loaner straight away and 4. calling me later at night checking if I got home ok and all was fine.

    What other car company would do such a thing?
     

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