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    Thread: Parasitic Power Drain

    1. 09-14-2020 04:36 PM #1
      Hey everyone, I have a 2012 Jetta TDI with about 90k miles.. I'm having an issue with my battery draining overnight or while I'm at work all day. I have had the battery checked at three different places and all checks come back good. I've been through my car at night and there are no lights switched on. Only then did I notice that my UltraGauge is remaining powered up on the 'Scanning ' page while the car is completely (for hours) shut off. So to my eyes, it seems as if the ECU is remaining powered up. Does this make sense to anyone? I've seen talk of this being symptomatic of a bad relay? Thanks for everyones help!
      Last edited by Marquesas14; 09-14-2020 at 05:19 PM. Reason: Details.

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    3. Member fastinradford's Avatar
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      09-14-2020 08:24 PM #2
      Does it still happen if you unplug your “ultra gauge”

      How far do you generally drive?
      Less than 15 minutes and you are discharging you’re battery.
      smiles per gallon in a tdi rabbit are unreal

    4. 09-14-2020 10:25 PM #3
      Yes, the battery was draining with the gauge unplugged. I plugged it in simply to check for engine codes. I typically drive 30-40 min each way to work.

      Quote Originally Posted by fastinradford View Post
      Does it still happen if you unplug your “ultra gauge”

      How far do you generally drive?
      Less than 15 minutes and you are discharging you’re battery.

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    6. Member fastinradford's Avatar
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      81 caddy VNT MTDI 02a.
      09-16-2020 01:46 AM #4
      When they checked your battery....

      Did you drive there?

      If you check the battery after having the engine running you will always get false positives. As it has just been charged up at high amps by your alternator.

      I would check the battery after the battery has sat overnight.
      As that’s when you have your problem.
      smiles per gallon in a tdi rabbit are unreal

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