Random Codes ON after Dongle Insertion

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by PriuSocal, May 19, 2026 at 12:36 AM.

  1. PriuSocal

    PriuSocal Member

    Joined:
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    Vehicle:
    2008 Prius
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    I purchased a Gearwrench OBD2 Dongle reader and when I tried inserting it into the OBD port It felt as something was impeding it from seating in. I wiggled it a bit (did not yank or force it) to seat it and then the YTOD came on and the “Check Hybrid System” came on BUT NO CEL. I immediately removed the dongle and turned the car off.

    I then hooked up my BlueDriver to it to see what had happen and had the following codes:

    - U0073 Control Module Communication Bus “A” Off
    - U0123 Lost Communication w/ Vehicle Dynamics Control Module
    - U0124 Lost Communication w/ Brake System Control Module
    - U0126 Lost Communication w/ Steering Angle Sensor Module
    - U0293 Lost Communication w/ A/C Control Module
    - U0129 Lost Communication w/ Hybrid Powertrain Control Module

    I went ahead and deleted those codes only and cleared Battery codes w/ Dr.Prius and the dash went back to clear w/ no YTOD. I drove the car and nothing different, runs, drives and brakes perfectly but i went ahead and used TechStream to do a Health Check and the above codes show up (see screenshot as well). I did do a search on here and found some people who had experienced same codes but they had issues with the ABS and FAIL SAFE activating which mine does NOT have so I am almost positive the GW OBD2 dongle caused this but now wondering how to delete all this without doing a whole ECU reset / Clear codes.

    IMG_3949.jpg

    Any help will be greatly appreciated.
     
    #1 PriuSocal, May 19, 2026 at 12:36 AM
    Last edited: May 19, 2026 at 12:46 AM
  2. Tombukt2

    Tombukt2 Senior Member

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    Vehicle:
    2009 Prius
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    I'd clear that U stuff . Heck the dongle pins ? I. Using same the long GW tool not the short 40 dollar unit .this is longer same color and 140bux I've used my on about 74 vehicles with no hiccups. Can even deal with electrics no kidding .can scan BYD and rivian and Mercedes .
     
  3. Tombukt2

    Tombukt2 Senior Member

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    This GW long thing has a hundred updates weekly .