Help TRANSMISSION CONTROL prius 3

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Shacill123, Mar 4, 2026 at 5:21 PM.

  1. Shacill123

    Shacill123 New Member

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    Location:
    Poland
    Vehicle:
    2012 Prius
    Model:
    Three
    I have a 2011 Toyota Prius.

    C2303

    C2304

    C2305

    C2306

    I checked the wiring, replaced the sensor on the transmission, replaced the integration relay, and replaced the relay. The only thing left is the transmission control module. How do I replace it? If I just plug it in, the immobilizer light flashes.
     
    #1 Shacill123, Mar 4, 2026 at 5:21 PM
  2. ChapmanF

    ChapmanF Senior Member

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    Mar 30, 2008
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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    It's part of the theft-protection system, so it needs to be introduced properly to the module that recognizes your key.

    I'm not sure any of us do that often enough to remember the steps offhand; it's the kind of thing I'd go straight to the repair manual for, to avoid possibly trying to follow mistaken instructions from the internet.

    Toyota Service Information and Where To Find It | PriusChat
     
    #2 ChapmanF, Mar 4, 2026 at 9:05 PM
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