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 or making a Paypal contribution here: paypal.me/SupportTMC

One month old P85 with 12V battery issue

Discussion in 'Model S: Battery & Charging' started by ACDriveMotor, Dec 9, 2013.

  1. ACDriveMotor

    ACDriveMotor Member

    Joined:
    Aug 11, 2013
    Messages:
    815
    Location:
    Seattle, WA
    VIN 22xxx. The weather has been pretty cold but my car is mostly indoors. I am a little surprised to have a 12V issue on a new car given the history. I wonder if new cars do not have the new deep cycle batteries?
     
  2. stevezzzz

    stevezzzz R;SigS;P85D;SigX

    Joined:
    Nov 13, 2009
    Messages:
    6,062
    Location:
    Colorado
    Sorry for your troubles, ACDM. I thought the 12V supplier issues had been ironed out long ago. Can you give us more details: miles driven, whether you plug in every day, etc.?
     
  3. ACDriveMotor

    ACDriveMotor Member

    Joined:
    Aug 11, 2013
    Messages:
    815
    Location:
    Seattle, WA
    According to the Bellevue SC they looked at the logs and traced this to a known issue with 5.8. They said the issue is that with shore-power battery pack warming (a new feature?) at times the contacts remain open and can drain the 12V battery. A fix is supposedly going to be pushed soon.

    Additional Details

    • They asked me to see if the car would go into drive.
    • When I hit the brake pedal both consoles re-booted and then charging started. Not certain whether the re-boot was them or me.
    • After charging completed the 12V alert went away.
    • They told me that with the cold weather I should disable scheduled charging until the fix comes out. They told me the fix might be “silent” and not result in an alarm clock update notice.
    • Plug in every day when I get home but use scheduled charging at 3am.
    • I am currently on the 1.49.24 release.
    • Drive 30 - 60 miles/day. Total miles ~1300.
    • They told me the 12V didn't fully discharge and so is still healthy.

    They told me the car was fine to drive. No issues on the commute.
     
  4. LJordan

    LJordan Member

    Joined:
    May 12, 2013
    Messages:
    26
    Location:
    Bolingbrook, IL
    I had a similar issue today. I was getting two error messages. It was around 10 F in Chicago today. I have not had any problems in the past. After talking to the SC, they want to take a look.
    IMG_20131209_222134_608 (2).jpg
     
  5. stevezzzz

    stevezzzz R;SigS;P85D;SigX

    Joined:
    Nov 13, 2009
    Messages:
    6,062
    Location:
    Colorado
    Great information, thanks!
     
  6. hans

    hans P631

    Joined:
    Sep 27, 2012
    Messages:
    1,123
    Location:
    Menlo Park
    #6 hans, Dec 17, 2013
    Last edited by a moderator: Mar 13, 2016
    I also had a problem with a scheduled charge during cold weather.

    At the time my car was running 1.49.24. It was the first time I tried a scheduled charge at 5am rather than 9pm or 11pm at night. Temps were just under 32F.

    My car woke up at 5am and tried to start charging but failed. I woke to an uncharged car, a near dead 12V battery, and an odd clicking noise repeating over and over (likely the reason for the drained 12V).

    I took the following video of the clicking sound for diagnostic purposes.



    I was plugged into a 110-120V outlet via an extension cord. However, I have used this cord and outlet many times with no problem.
    Tech on the phone confirmed the 12V was low. Once I started the car and then plugged it into my 240V outlet it recharged the 12V and cleared the fault. Tesla pulled the logs and could see the problem as well as they said the 12V was showing as good and that I should be fine to drive the car.
     
  7. ACDriveMotor

    ACDriveMotor Member

    Joined:
    Aug 11, 2013
    Messages:
    815
    Location:
    Seattle, WA
    #7 ACDriveMotor, Dec 17, 2013
    Last edited: Dec 18, 2013
    Yup. That was my experience. Since .30 I've started using scheduled charge again (3am) - but my garage temps are now consistently above 41F. So I can't tell if .30 fixed or whether the temperature is the fix. I was supposed to get a call back from the SC letting me know when the fix was pushed - nada.
     
  8. Doug_G

    Doug_G Lead Moderator

    Joined:
    Apr 2, 2010
    Messages:
    15,851
    Location:
    Ottawa, Canada
    #8 Doug_G, Dec 18, 2013
    Last edited: Dec 18, 2013
    It appears my car had the issue, but I'm told the update fixed it. Ironically I got the warning message and the update the same evening.

    Edit: I'm told there is still a firmware update in the works, and to discontinue timed charging if the problem recurs.
     
  9. VolkerP

    VolkerP EU Model S P-37

    Joined:
    Jul 6, 2011
    Messages:
    2,455
    Location:
    Germany
    I had very similar symptoms on Dec 1st, 2013 with my EU Model S 60kWh. Firmware 1.49.24. Plugged into 13A 230V single phase outlet, charging set to start early in the morning. Night was chilly around 0°C. Found the car not fully charged, low 12V battery warning, clicking noises.
     

Share This Page