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Thread: i-Eloop supercap failure on '16 GT

  1. #1
    Registered Member ceric's Avatar

    2017 Mazda CX-5 GT, 2016 Mazda6 iGT, 2014 Mazda3 sGT hatchback

    Join Date
    Jan 2008
    Northern California

    Talking i-Eloop 12V Battery failure on '16 GT

    For those who own GT with i-Eloop, you might want to read this.

    The 12V battery used in i-Eloop system is prone to failure after 3-4 yrs of normal use.
    Mine just failed a couple months ago. My co-worker's GT ('15) also did last year.
    So, two out of two in our company.
    Mazda dealers seem to know this problem very well.
    Mazda no longer have i-Eloop in newer Mazda6. That speaks for itself.

    Two case studies here. If you are a GT owner with i-Eloop, here is how you can save money.
    It started with "Battery Management System Malfunction" in dash display.
    It pops up once every week, and disappear after 1 day or so.

    Case 1: my co-worker's.
    Her i-Eloop failed. She went to dealer (same as mine).
    They quoted her ($500 for the parts, and $250 for labor). $750 !!! No kidding.
    I told her to call MazdaUSA since her car was just out of warranty.
    MazdaUSA was nice enough to cover the part, and she was to pay for the labor (needs programming unlike normal battery)
    Better than full amount, right?
    When she went to pick up the car, the dealer charged her $0.

    Case 2: mine.
    It happened more than 1 month ago. I knew what it was, thanks to what my co-worker encountered.
    My Mazda6 was 3.5yr (out of warranty also) old. I took time to investigate the issue... how the error popped up once every week, and disappeared after 1 day. etc.
    Today, I went to visit the dealer. They knew what the problem was.
    While I was there, they quoted me $875 for total cost.
    I said: "No way I am paying this much. I will pay for the diagnosis, and please give me the case number. I will talk to MazdaUSA. I got three Mazdas. That speaks for something."
    The adviser was new. She talked to her manager.
    The manager invited me into his office.
    I nicely told him that, I am going call MazdaUSA to help me out on the cost.
    He told me that he couldn't get hold of any representative (MazdaUSA).
    He made a couple calls and the dealer (his supervisor) decided to use DSW to cover my expense. $0 to me. Nice.

    So, there you have it.
    Anyone who owns a GT with i-Eloop needs to be aware of this.
    Your 12V battery might fail sooner than you expected.
    When it does, call MazdaUSA (and be nice, which helps).

    The i-Eloop is a dumb engineering experiment for sake of tiny bit of MPG improvement.
    The Q85 battery (12V) that works with i-Eloop is a deep-cycle one. It costs $$$$ itself, and it needs reprogramming to work in i-Eloop system.

    Unlike Honda/Toyota, MazdaUSA is very helpful.
    All I can say.
    Last edited by ceric; 11-23-2018 at 06:56 PM.
    2016 Mazda6 iGT + Tech Pkg
    ....Sonic Silver Mica / Parchment
    2014 Mazda3 sGT hatchback
    ....Soul Red Metallic / Almond

  2. #2
    Registered Member

    Mazda6 GT, MX5 PRHT

    Join Date
    May 2015
    Upstate, SC
    Cool they covered it as they should in my opinion. They recently replaced all my alloy wheels on my GT due to paint flaking off and my car was 3 months out of warranty. It is also a known problem. My car was built in June of 2015 so I assume the paint on the new wheels will hold up. I'm pleased with how Mazda and my local dealer has treated me.

  3. #3
    Registered Member concept's Avatar

    2014 Mazda3 S GT auto, 2008 MX5 6-speed

    Join Date
    Mar 2009
    San Diego
    Quote Originally Posted by ceric View Post
    The i-Eloop is a dumb engineering experiment for sake of tiny bit of MPG improvement.
    Next, the battery (12V) that works with i-Eloop is a deep-cycle one. It costs $$$$ also.
    Fingers crossed....
    It is great that the defective part(s) is replaced without charge, but the big question is: Is the replacement part an updated (improved) version of the original or is it exactly the same part. If it is an updated part, you may never have another problem with it. Of course, if the failed part is an anomaly, then it may be perfectly acceptable to receive a version A replacement. However, this doesn't seem to be the case if the failures are not uncommon.

    So if this happens to my car's capacitor, the first thing I would ask Mazda is whether they have analyzed the failure and upgraded the part so as to prevent reoccurring incidences of failure. If they haven't, they should provide a written guarantee for the replacement part, IMO.
    2014 3S GT, Deep Crystal Blue, Eibach Pro-Kit, Enkei PF01s, Koni Sports, Pirelli P ZERO ALL SEASON PLUS tires, 225/45/18
    2008 MX-5 Touring (Mazdaspeed CAI, HIDs, Progress/Koni Sports/Racing Beat sways, SST Magnaflow muffler and tips)

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