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:
    Mar 23, 2023
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    Location:
    SoCal
    Vehicle:
    2008 Prius
    Model:
    N/A
    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