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Key fob not working after battery replacement

Discussion in 'Model X' started by Ryan MF, Feb 16, 2019.

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  1. Ryan MF

    Ryan MF Member

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    One of my MX key fobs stopped working this winter and the other key fob had a low battery warning so I went ahead and replaced both batteries. They were more than two years old.

    After replacing the batteries neither fob worked. I ordered the same type of batteries and tried resetting them a few times. Today I took both keys to Tesla and they said they also could not get them to work and would order replacement keys.

    This seems very strange that both fobs would completely stop working after a battery change? I suppose one could have died before but seems too coincidental. Has anyone experienced this or any ideas of how to bring them back to life?
     
  2. Sandiegodoug

    Sandiegodoug Member

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    I had the same problem. One key fob went dead, replaced batteries, still dead. Tesla replaced. They had to reprogram car to accept fob.
     
  3. boaterva

    boaterva Supporting Member

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    There are several threads about this, I had the same problem last year and also had to have Tesla reset the car’s fob programming. This seems to be one reason they do the fob battery replacement at the annual service because they have the car in the shop.

    Last week I did replace the battery in one fob of my X and it worked. Here’s what I did different. I did it in a few seconds and within range of the car. I’m surmising that having the car awake and seeing the fob had it accept/re-acknowledge the fob when it came online. Before I did it in the house and it didn’t recognize it.

    I’ve never heard of one dying killing both of them but anything is possible. I also thought that perhaps it has been made better with recent software but obviously not, so perhaps my process helped (short downtime, car active, etc.).
     
    • Informative x 1
  4. Ryan MF

    Ryan MF Member

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    Interesting...thanks for sharing. I still find it strange they would need to order new keys if it was a reset of the car's fob programming. you would think they could reprogram the existing ones. Hopefully there is no charge for the keys.
     
  5. Sandiegodoug

    Sandiegodoug Member

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    There was no charge
    Ranger had a hard time programming new fob. Was here at least an hour. The first replacement fob didn’t work either. Lucky he had a 2nd new one, was able to make work.
     
  6. Ryan MF

    Ryan MF Member

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    Good to know. Thanks
     
  7. Shaz

    Shaz Member

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    This happened to us this week. One of our fob key battery was getting low, after replacing fob key refused to work. Took the same battery and installed it on to the working fob and that worked fine, so it definitely was not the battery. Contacted Tesla and was told a Ranger would come by to help. Got an email from the Tesla Ranger indicating that they are ordering parts (I'm assuming a new key fob) and the wait time for that is 1-2 weeks. Luckily we still have one working.
     
  8. soulreaver99

    soulreaver99 Member

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    i have the exact same issue with my Model S. At first I thought I bought a pack of dead batteries so I returned it. Got another one and it still did not work. Tried the old battery and it worked fine. This is the weirdest thing ever
     
  9. Freerster

    Freerster Member

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    A week ago my car showed I had a low battery in my FOB and I thought it was wierd because service just changed them 3 months ago. I broght my other FOB out to see if it showed a low battery in that one and it did. Today I got new batteries and I changed them out. It still show low battery so i'm not sure what it is. Maybe it has something to do with the new update. Im calling service now and I will update when I find out and will l post later.
     
    • Like x 1
  10. Big Ike

    Big Ike New Member

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    I’m having the same issue that my fob with the replaced battery is not being recognized by my MX. Looks like scheduling service is the only option to correct?
    Thanks Gang!
     
    • Like x 1
  11. gangzoom

    gangzoom Member

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    Why does this happen? Does it mean every 2 years we all have to get new keys from Tesla?? What happens when the warranty is gone?
     
  12. boaterva

    boaterva Supporting Member

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    Usually it’s fixable with a reset/reprogramming on the car’s side. Why it’s needed is another thing, makes no sense, but my experience doing it with the car powered up and ‘close’ to the car helped.

    Interesting that before it was part of annual service and now that’s (annual service) no longer needed!
     
  13. DCGOO

    DCGOO Active Member

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    The key fob is still a warranty item, even without annual service.
     

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