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MX 12V battery issue - symptoms to note

Discussion in 'Model X' started by ShaneX, Sep 13, 2017.

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  1. ShaneX

    ShaneX Member

    Joined:
    Dec 16, 2016
    Messages:
    30
    Location:
    Cambridge
    Hi all,

    My MX had to be towed to an SC following a failed software update.

    Seems what has happened is there was an underlying problem with keeping the 12V battery charged (not bad enough to give me a warning though). During the update, the low voltage caused it to soil the bed, and it could not recover.

    Afterwards, though boosting the 12V with a 30A portable starter was enough to wake the car, it was stuck in park and had to be moved on skates.

    I'm mentioning this because there was never any screen warning of a 12V problem. BUT in hindsight maybe there was a symptom-clue; recently the car would not wake up when I approached with the key, instead I'd have to open a door, then it would wake. I had energy saving modes activated so thought this was the reason (only had car for 2 months).

    So the point is: if you get the same symptom (not waking), call tesla and get them to check the battery voltage (the small one not big!)

    Shane
    PS with the booster connected, tesla could see the car, and said it had 20A discharge! Thats almost a mile of range per hour. Thirsty vampire somewhere in my car!
     
    • Informative x 4
  2. verygreen

    verygreen Curious member

    Joined:
    Jan 16, 2017
    Messages:
    1,162
    Location:
    TN
    AP2 computer draws quite a bit of power and it's on blasting at full speed with image processing on that GPU even if it does not show it on IC when you open a door.
    If you leave your car plugged in (recommended thing), the ap computer stays on for 2 hours after you last put the car in park (!), I am sure the 12V battery appreciates all the extra power draw.
     
    • Like x 1
  3. apacheguy

    apacheguy S Sig #255

    Joined:
    Oct 21, 2012
    Messages:
    4,530
    Location:
    So Cal
    What if you haven't purchased/enabled AP on your vehicle? Does the ape still power on full blast?
     
  4. verygreen

    verygreen Curious member

    Joined:
    Jan 16, 2017
    Messages:
    1,162
    Location:
    TN
    I have no idea, but I think so since it's somehow involved in showing the local speed limit (when ape crashes, it's not shown) or traffic around you (this is still shown even if you don't pay for ape, I assume?)
    The decisions to show or not show additional controls are made on cid, ape is not really aware if anything is receptive to things its broadcasting or not (e.g. even when you are in park it still does its thing, but the car is not showing anything)
     

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