TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Gen 2 charger ground faults

Discussion in 'Model 3: Battery & Charging' started by boilerbots, Jan 28, 2018.

  1. boilerbots

    boilerbots Member

    Joined:
    Apr 4, 2013
    Messages:
    62
    Location:
    San Jose, CA
    i have a Model S with a gen 1 charger and have never had ground faults. I am getting ground fault errors, 1 flashing red blink, maybe 50% of the time after connecting to charge. I plugged the charger into the same outlet as my S and it still happens.

    Anyone had a problem like this and found that it was the adapter and not their home wiring?
     
  2. Need

    Need Active Member

    Joined:
    Nov 22, 2017
    Messages:
    2,248
    Location:
    SoCal
    Is that what that is called? Flashing red light on the mobile unit... a ground fault? We got it all the time when we first got our MX (that comes with the Gen 2 UMC). I would have to unplug it, plug it back in and it would be okay for next charge. But just about every time the charger comes out from the port and put it back it.. got the flashing red lights.

    After a few days, we called Tesla and they came out and replaced the Gen 2 with a Gen 1. Now it never ever flashed red again.. been over a month now. And it also charges faster. :D
     
  3. run-the-joules

    run-the-joules Active Member

    Joined:
    Aug 13, 2017
    Messages:
    2,746
    Location:
    SF Bay
    Ooooh, this is happening to me too. If I plug into the car and then the wall, it's fine. Wall and then car… roll of the dice. Was going to bring it with when I take the car to get the heater checked, but having them send a ranger isn't a bad idea.
     
  4. cwerdna

    cwerdna Active Member

    Joined:
    Jul 11, 2012
    Messages:
    2,469
    Location:
    SF Bay Area, CA
    What do you mean by "charger"? For level 1 and 2 AC charging, the charger is on-board the car. See Range issues - Page 2 - My Nissan Leaf Forum.

    For the L1 and L2 AC cases, the external unit (e.g. Tesla Product Page Template and Model S/X/3 Wall Connector) are EVSEs, NOT chargers. Notice Tesla calls them connectors and not chargers?

    You having a problem w/the mobile connector or wall connector as opposed to the car's on-board charger?
     
  5. DFibRL8R

    DFibRL8R Active Member

    Joined:
    Jan 17, 2013
    Messages:
    1,128
    Location:
    Leesburg Virginia
    I’ve been having problems with my new UMC/EVSE that came with the Model 3. I have been using it to charge the Model S on a 110 outlet (using the Model S Charger on a 14-50 for the new Model 3 since it has a higher charge rate). I’m getting frequent Red charge ring light. Oddly the steady Red ring flashes blue briefly then back to steady red. Unplugging the UMC from the wall seems to reset and it works again, for a short time.
     
  6. boilerbots

    boilerbots Member

    Joined:
    Apr 4, 2013
    Messages:
    62
    Location:
    San Jose, CA
    Sorry to call the wall adapter thing a charger, I dumbed my question down to much. I meant the “mobile connector”.

    So it seems a few others are seeing the frequent faults. I should probably contact Tesla and see what they say considering the gen 1 has never faulted on the same outlet over 5 years.
     
  7. Need

    Need Active Member

    Joined:
    Nov 22, 2017
    Messages:
    2,248
    Location:
    SoCal
    Yeah you should. They will probably just exchange it with a good one. There was another thread in the Model S forum that a new MS owner got the Gen 2 UMC and having the same problem. Maybe there is a bad batch of Gen 2 UMC out there.
     
  8. EdinSD

    EdinSD Member

    Joined:
    Apr 12, 2018
    Messages:
    6
    Location:
    San Diego county
    I see this is the Model 3 forum, but we got a new Model S a month ago with a Gen 2 cable, and are having the exact same issues. It always works if I plug in to 110. On 240, mostly it errors with the ground fault code. I usually fix it by flipping the breaker on the house panel off and back on again. Sometimes just unplugging it from the wall and plugging back in works.

    I had our electrician out to double check his work. Of course it didn't error out when he was here! Then the Tesla ranger guy came out and gave us a brand new Gen 2 cable. It worked when he was here, but then later, the error code again.
     
  9. Ted209

    Ted209 New Member

    Joined:
    Mar 13, 2018
    Messages:
    3
    Location:
    California
    I'm on my third Gen 2 mobile connector for my new Model S and I get a ground fault error about half the time I plug it in. I usually disconnect the cable, then pull out the connector out of the socket and back in again (wish there was a reset button) and there's about a 50% chance of success. Sometimes I need to do this half a dozen or so times to make it work. My previous Model S never had this problem with the Gen 1 mobile connector
     
  10. Karma

    Karma Member

    Joined:
    Nov 17, 2014
    Messages:
    95
    Location:
    Safety Harbor, Florida
    Glad to see that we are not the only ones. I never had an issue with the Model S. Model 3 is a different story. 50% of the time the car fails to start charging, or starts, then faults. If I unplug from the 14-50 and replug to the outlet, it seems to to work. Major PITA, if you ask me, but even more so for my wife, who isn't as used to waiting to make sure that charging has started (and not terminated due to fault).
     
  11. TexasEV

    TexasEV Well-Known Member

    Joined:
    Jun 5, 2013
    Messages:
    7,613
    Location:
    Austin, TX
    I’m also on my 3rd gen 2 UMC. The one that came with the Model 3 was replaced because the buttton didn’t depress easily, The replacement UMC had ground fault errors about one time in 5 that I plugged it into the charge port. The next replacement has worked fine for the past few days.

    In contrast, the UMC that came with my Model S five years ago lasted for 4 years. And that was supposed to be the less robust than Gen 2 because it charged at 40A.
     
  12. sunnyg

    sunnyg Member

    Joined:
    Mar 22, 2018
    Messages:
    7
    Location:
    Bay Area California
    OMG I'm so glad I found this page... I've been splitting hairs trying to figure this out. I'm on my second generation 2 charger and it's still showing ground fault even though the certified electrician that installed the 240v outlet proved to me that everything was installed correctly with a meter. This thread seems to confirm for me that there is something wrong with the UMC and not the outlet that works half the time. Has anyone had luck after getting the UMC replaced multiple times? Also I'm on the new Mcu.
     
  13. TexasEV

    TexasEV Well-Known Member

    Joined:
    Jun 5, 2013
    Messages:
    7,613
    Location:
    Austin, TX
    When the service center plugged my gen 2 UMC into their 240V outlet to charge my car with it, it gave a ground fault one time out of the 10 times they tried it. So they knew it was the UMC, not my outlet, but the problem with diagnosing such an intermittent issue is they need to try it many times to reproduce it. The replacement UMC has worked fine at home.
     
  14. datarsd

    datarsd New Member

    Joined:
    Sep 4, 2018
    Messages:
    2
    Location:
    Cupertino, CA
    I am facing the same issues - ground error. Is the wall charger better at this than the mobile (UMC) charger?
     
  15. Cosmacelf

    Cosmacelf Well-Known Member

    Joined:
    Mar 6, 2013
    Messages:
    6,154
    Location:
    San Diego
    I’ve never heard of this being an issue with the Wall Connector. In general, it is much more robust.
     
  16. datarsd

    datarsd New Member

    Joined:
    Sep 4, 2018
    Messages:
    2
    Location:
    Cupertino, CA
    thanks
     
  17. McBtes

    McBtes New Member

    Joined:
    Aug 30, 2017
    Messages:
    2
    Location:
    UK
    I have had this problem and the answer for me is to put a hose on the ground spike .... with v dry weather, the soil pulls away from the spike. Put water on on (for 20 mins or so) and it works.
     
  18. eprosenx

    eprosenx Active Member

    Joined:
    May 30, 2018
    Messages:
    1,896
    Location:
    Beaverton, OR
    If this is truely what is making your charging work then you have a SERIOUS issue with your electrical system and you need to have an electrician out right away.

    What an EVSE is testing for is *not* that your ground is connected to earth. It is really testing to make sure your ground and neutral are bonded together. It is checking for voltage potential between the hot conductors and the ground. Whether ground is actually connected to the earth is not something it can test for.

    If what you describe is true, then it sounds like your house does not have neutral and ground bonded and you are relying on the earth providing a conductor from your ground rod back to the utility transformer.
     
  19. geometro

    geometro Member

    Joined:
    Jun 24, 2015
    Messages:
    329
    Location:
    Bay Area, CA
    Mine started acting up last week too. The mobile charger shows the letter “T” in red (rather than green).

    When I called up the service center, they said it was the outlet. How do I get them to replace the mobile charger?

    (It went away after I unplugged the charger and plugged back in; just happened again this morning though).
     
  20. 14vision

    14vision Member

    Joined:
    Nov 15, 2018
    Messages:
    7
    Location:
    West palm beach
    Same issue here and it is intermittent. Red t plug unplug etc. then charges. Next time usually red t again.

    Have model s with gen 2 charger...
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC