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Consolidated eMMC Thread (MCU repair) (Black Center Screen)

Discussion in 'Model S' started by Wiki, Jan 8, 2020.

Thread Status:
The first post in this thread is a WikiPost, and can be edited by anyone with the appropriate permissions.
  1. GlmnAlyAirCar

    GlmnAlyAirCar Active Member

    Joined:
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    I had the same issue. Would only charge to 21% it turns out. It seems to happen with some and not others.
     
    • Informative x 1
  2. MikeBur

    MikeBur ManualPilot

    Joined:
    Dec 8, 2014
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    1,369
    Location:
    Seattle, WA
    Exactly, yes. Not tailgating car, though momentarily distracted to point where I *definitely* would have had the nag and I’ve convinced myself AEB would have kicked in. I missed the other car by going beside them under severe braking.

    MCU had completely failed, and this was driving on way to SC. My animated contention was htf was this not covered by breakdown service and do they accept liability. They took the car in immediately and one denied AEB was effectively disabled.
    Was covered, and already fixed, under extended warranty, though Tesla should provide what is known reduced functionality, doubly so for safety features.
     
  3. supratachophobia

    supratachophobia Active Member

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    Columbus, Ohio
    Thank you for everyone involved in this repair. Is it safe to assume that if you perform this fix preemptively, that you can continue using the car with zero negative side affects to features or functionality?

    And that if you wait until a failure, there is a very good chance that not everything can be recovered and you could suffer long term negative side affects to features or functionality?
     
    • Like x 1
  4. rsg123

    rsg123 Member

    Joined:
    Jan 1, 2018
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    510
    Location:
    Sacramento
    My car is at 85k miles and 5 years 4 months since delivery.
    I have a $5k service credit with Tesla but I’d rather spend $2500 of it on tires rather than an MCU replacement which may only last another 4 years.
     
    • Like x 1
  5. Shadious

    Shadious Member

    Joined:
    Jan 11, 2018
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    Location:
    Florida
    In my opinion, replacing the eMMC chip is a much better fix, as it is permanent. The replacement MCU will certainly fail in the future, as the chip is not robust enough or large enough to handle the data logging. My car is almost exactly the same vintage as yours 12/14 build, 87k miles. Some have failed at about half those miles. I am very pleased with the fix and as stated, I also got a chance to upgrade to LTE. Not sure if really made a difference, but it was only about $100 and all the labor was already invested. Id say go for it if you are swing signs of failure. My car shut down the MCU completely, but I was able to have everything copies to the new eMMC chip.
     
    • Informative x 1
  6. Jillmark99

    Jillmark99 Member

    Joined:
    Feb 1, 2019
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    185
    Location:
    Ontario
    I have a question regarding turning off scheduled charging. Why should it be turned off if one suspects the eMMC is on its way out? Is it because the vehicle won’t know what time it is or it won’t know it’s GPS location? Reason I ask is I don’t want to be stuck if mine fails.
    Will it not continue to charge at home if scheduled charging was previously enabled? If a vehicle has scheduled charging at several locations do I need to drive around to each location and turn it off?
    I don’t use PIN to drive so I’m not worried about that but would hate to be stuck with no charging ability.
     
  7. Cavell219

    Cavell219 Member

    Joined:
    Jun 22, 2019
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    33
    Location:
    Indiana
    My December 2015 S did not charge with the emmc failed although I did not try under 21%. There is a thread around that is trying to figure out why some cars will only charge up to 21%. For your question yes the vehicle trigger for delayed charging is handled by the MCU which when the emmc is failed does minimal functions.
     
  8. TonyT

    TonyT Member

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    This is educated guess since I have not experienced this issue myself and only collected info.

    1. Many functions stay the way they are when MCU finally fails.
    2. Time is likely unknown, however if your car fails at a scheduled location during the schedule time, guess what happens....
    3. We have not been able to solve the 21% issue yet
    4. Likely the "strange" issues just don't have enough data collected around it to identify the cause...
     
    • Like x 1
  9. possum22

    possum22 Member

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    Nov 16, 2016
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    110
    Location:
    Mt. Isa, Qld
    I had 'Pin to Drive' enabled, when my eMMc started failing at 22500km, 4 years 4 months, the MCU reset itself to default, no 3G access. When it totally failed, the HVAC was stuck on, I stopped it disconnecting 12 volt battery & pulling the 1st response's HV loop. To maintain HV pack charge level, I left the HV loop pulled & put 12 volt battery charger on the battery, until I needed to drive the car.
     
    • Like x 1
  10. CravingMender9

    Joined:
    May 13, 2019
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    104
    Location:
    Charlotte, NC
    Thank you very much for this thread. I'll most likely have to do this in the near future. One thing I'll recommend is to have the experts and their locations in the title post. That way people can directly know and reach out to the experts nearest to them. Also, is the fee charged by all of your similar? If all are ok, it'll be helpful to put that in the FP too.
     
  11. EV-Fixme

    EV-Fixme Vendor

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    Oct 24, 2019
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    Orange County, CA
    Yeah... had that but got locked... Think it was too commercialized..
    There are differences in fees and services... I avoided that fearing lock... So far this is what seems to be allowed.
     
    • Like x 1
  12. MP3Mike

    MP3Mike Well-Known Member

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    Oregon
    Yeah you have to pay for "vendor" account on TMC to post prices, etc.
     
  13. EV-Fixme

    EV-Fixme Vendor

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    working on it ;) but once i do that it will only be my stuff... Before I collected everyone I know who does it.
     
  14. CravingMender9

    Joined:
    May 13, 2019
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    Location:
    Charlotte, NC
    Understood, and makes sense for listing pricing. Thanks for ther clarification. But location based listing of the experts who can help us regular owners will be extremely helpful to everyone. I don't see how that comes under the "vendor" classification. I already see you / Tony helping people connect with local experts. Very thankful for that.
     
    • Like x 2
  15. supratachophobia

    supratachophobia Active Member

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    Location:
    Columbus, Ohio
    Anyone near Ohio?
     
  16. EV-Fixme

    EV-Fixme Vendor

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    Orange County, CA
    You have Rich Rebuild, and WK057 on the that coast, or you can send to me ;)
     
  17. IndyToronto

    IndyToronto Member

    Joined:
    Nov 14, 2019
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    Location:
    Toronto, Canada
    Has anyone found a way when under waranty to get Tesla to fix/replace the MCU because of the eMMC problem? My 2016 is now always glitching on streaming typically within 15-30 minutes of each drive. Basically any spotify streaming would eventually reach a point of stuttering and then silence along with a single bar 3G and missing traffic navigation data. The only reliable audio I get now is the AM/FM radio.

    This is now happening at least twice a day.

    The car is still under warranty, so I don't want to do anything to risk an excuse to void the warranty. Any advice on how you got Tesla to fix your eMMC problem? How would I go about reporting this or requesting a service appointment?
     
  18. EV-Fixme

    EV-Fixme Vendor

    Joined:
    Oct 24, 2019
    Messages:
    580
    Location:
    Orange County, CA

    They replace when your mcu wont boot anymore. You can stream music to help use it up.
     
  19. SmartElectric

    SmartElectric Active Member

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    2,373
    Location:
    Toronto,Canada
    Have you tried temporarily using a 4g MIFI hotspot and bypassing the MCU1 3g cell connection to see if that changes the behavior? I find 4g hotspot audio much more responsive. Note : my MCU1 is glitch free after 7 years and 140000 km, but I do switch to 4g hotspot wifi connection when driving in areas with poor 3g coverage.

    Also, there are tricks to clean up old navigation locations which can dramatically speed up MCU1.
     
  20. supratachophobia

    supratachophobia Active Member

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    Location:
    Columbus, Ohio
    "On that coast".... Not exactly the convenient distance I was looking for :rolleyes:

    But yes, can I PM you?
     
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