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Ultraguage Issue

Discussion in '2nd Gen Tundras (2007-2013)' started by Jack Burton, Jun 1, 2015.

  1. Jun 1, 2015 at 4:08 AM
    Jack Burton

    Jack Burton [OP] New Member

    Jan 7, 2014
    Little China
    2013 DC 5.7L TRD/OR
    Tires, Diamondback HD Tonneau w/ ATV Carrier
    During my 25K service a few weeks ago, the dealership replaced my battery. When I got in the truck to leave, I noticed that my ABS and VSC lights were both on solid (you'd think they'd have noticed it too, but that's another issue). They called out a svc manager who took it back in and reset everything. He said he ran a complete diagnostic and everything was good to go.

    Fast-forward to a couple days ago and I had to disconnect the positive battery cable in order to remove an accesory wire I no longer needed. When I got in the truck the next morning, lo and behold my ABS and VSC lights were on solid again and my BRAKE light was flashing some sort of code pattern.

    My Ultraguage was blank so I unplugged/replugged it with the truck running and it reset itself. That didn't change the dash lights though, but when I shut the truck off then restarted it, everything went back to normal.

    So, apparently having the UG plugged in, but not functioning was what was causing the idiot lights all along and the svc mgr never needed to do the whole diagnostic scan. Moral of the story: If you have an Ultraguage, unplug it before disconnecting your battery, then plug it back in once everything's up and running again. I guess.
    Gtfour43 and Black Wolf like this.
  2. Jun 1, 2015 at 7:05 AM
    Black Wolf

    Black Wolf INCOGNITO undercover mafia

    Apr 20, 2014
    First Name:
    Aurora CO
    2022 Nissan Frontier SV 4X4
    TuwaPro headache rack

    Dang. It seems like there are infinite possibilities to trigger these lights. I guess.:annoyed:
  3. Jun 1, 2015 at 10:25 AM

    Mike Tread lightly.

    Jan 13, 2014
    First Name:
    south carolina
    2003 tundra sr5 4x4 stepside....
    yep bank account is running low from it..
    Scan gauge has a cap in it for memory. I suspect the scan gauge trying to feed a small about of power backwards in the truck as the cap discharges. In turn feeding power to other low volatge system causing the errors.

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