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Limited Charging Error Message

Discussion in 'Model 3: Battery & Charging' started by photonphil, Sep 20, 2019.

  1. photonphil

    photonphil Member

    Joined:
    Sep 11, 2019
    Messages:
    36
    Location:
    West Coast
    I had a Tesla-certified electrician install a NEMA 14-50 outdoor box on a 40 amp circuit this morning. Picked up my car this afternoon, and when I plugged it in, got an error "Charging Cable may not be plugged in correctly" and max out at 16 amps/231 V. Is my panel overloaded or did the electrician possibly mess it up somehow?

    I went to a regular Tesla charging station as well as a SuperCharger and verified charging speed was as expected and no error messages. The charging cable was definitely seated correctly, I tried re-seating multiple times.
     
  2. timk225

    timk225 Active Member

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    Pittsburgh
    What gauge wire did he use? How many feet long?
     
  3. justsomeguy

    justsomeguy Member

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    Jul 4, 2019
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    Location:
    Vancouver, Bc
    If your panel were overloaded the breaker(s) would trip and you'd lose power, it wouldn't just limit charging current.
     
  4. power.saver

    power.saver Supporting Member

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    Location:
    Arcadia, CA
    I wouldn't trust your electrician. A NEMA 14-50 is supposed to be on a 50A breaker (that's what the "50" in the name implies). If he got this wrong, it's possible he got the wiring wrong too. Don't use it until you have it checked by a licensed electrician.
     
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  5. MP3Mike

    MP3Mike Well-Known Member

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    Oregon
    Unplug the car and plug it again again, and make sure you push very firmly. (The plug may not have gotten seated all the way.)
     
    • Helpful x 1
  6. eprosenx

    eprosenx Active Member

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    May 30, 2018
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    Location:
    Beaverton, OR
    This error is caused by the Mobile Connector cord not mating properly into the car. Because the car can not confirm the connector is locked in properly it limits charging current as to reduce the arc flash potential if you pulled out the connector under load.

    Something is wrong with your mobile connector or the charging port. Contact Tesla. In the meantime, check the connector and charging port for any foreign objects or debris. Try inserting it differently and see if you can’t get it to latch.

    I should also note that while the install is code compliant on a 40a circuit (since the UMC gen 2 will only draw 32a max continuous), it is disappointing. I generally only install 50a circuits for 14-50 receptacles as I want to be future proof and I don’t want someone else plugging in a 40a EVSE (which requires a 50a circuit) and melting something.
     
  7. photonphil

    photonphil Member

    Joined:
    Sep 11, 2019
    Messages:
    36
    Location:
    West Coast
    8 gauge, 16 inches maybe? The panel is opposite the outside wall where the receptacle is.
     

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