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12V battery issue, service wants to replace DC-DC converter

Discussion in 'Model S: Battery & Charging' started by hokie, Apr 26, 2017.

  1. hokie

    hokie New Member

    Aug 10, 2015
    Fairfax Station, VA
    2013 Model S 60

    So yesterday I got into the car and saw a 12V battery low warning and thought, ok I am going to have to call service and schedule an appointment to replace the 12V battery after I get to work..... But turns out the battery is too discharged to even get the car moving. The main battery was fully charged to the daily limit 90ish%. I had no previous warning that the 12V battery was low and I had to be towed to the service center. Now that it is at the service center they want to replace the DC-DC High to Low Voltage converter ($2100 part $400 labor). The 12V battery is probably around 18 months old. Has anyone had to replace the DC-DC High to Low Voltage converter? On the one hand, I had no warning that the 12V battery was going dead, on the other hand it is 18 months old.
  2. kort677

    kort677 Banned

    Sep 17, 2015
    sadly the 12 v battery has been a weak spot for awhile. it is troubling that you became stranded but it isn't uncommon. it happened to me however I caught it quick and the service team was very proactive and they came out, took the car and returned it in a day after making the necessary fix. unlike you my car was around a year old and there was no charges for the fix.
  3. miimura

    miimura Active Member

    Aug 21, 2013
    Los Altos, CA
    If you are out of warranty, I would ask about core value and whether you can keep the original part. In the long run, these large EV parts like DC/DC Converters and On-Board Chargers need to be repaired or rebuilt, not just discarded and replaced with new. You could also look for one from a salvage and ask Tesla if they will install it for you.
  4. GJ79

    GJ79 Member

    Mar 15, 2016
    So much for the less moving parts and less maintenance claim. I feel you, I had so many issues with the 12 Volt message and it took them weeks to months to find the actual issue which was actually in the main pack. I hope for you they are right and it's just the DC-DC converter.

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