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P Lock Malfunction HELP!

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Jessemkane, Mar 14, 2016.

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  1. Rebound

    Rebound Senior Member

    Joined:
    Mar 11, 2010
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    Location:
    Portland, OR
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    It's not a common code:
    "Open in B+ Circuit"
    - Transmission control ECU assembly
    - Auxiliary battery
    - Wire harness or connector

    This link has the full troubleshooting procedure. See if this helps.
    https://techinfo.toyota.com/t3Portal/document/rm/RM1290U/xhtml/RM00000428Y000X.html?sisuffix=ff&locale=en&siid=1458059484517

    2010 Prius Diagnostic Trouble Code Chart - PriusChat
     
    #21 Rebound, Mar 15, 2016
    NutzAboutBolts likes this.
  2. Jessemkane

    Jessemkane Member

    Joined:
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    Location:
    Illinois
    Vehicle:
    2013 Prius
    Model:
    Persona
    Well, problem solved. Apparently in my hurry to check all of my fuses I missed one... Number 10 IGCT Fuse - 30amp. Tested each of them individually with a power probe and found that one to be blown, replaced it and all is fixed.

    So now that my lesson has been learned, ill be putting an in line fuse on the power wire I run to my gauges before I attempt to hook them up again. Thank you everyone for the help and DonDNH, you were correct. Thanks again!
     
    #22 Jessemkane, Mar 16, 2016
    DonDNH and Rebound like this.
  3. Quixrhyno

    Quixrhyno Junior Member

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    Jun 24, 2014
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    Vehicle:
    2007 Prius
    Model:
    II
    After 3 months trying everything suggested in these posts I decided to replace every ECU I can get to and BRAVO!!! The 1st one fixed it. The Transmission ECU under the AC unit on the passenger side. Oh man, I’m a happy camper now!
     
    #23 Quixrhyno, Mar 21, 2019
    Rebound likes this.
  4. Wasif Karim

    Wasif Karim New Member

    Joined:
    Aug 21, 2019
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    Location:
    Dallas, TX
    Vehicle:
    2012 Prius
    Model:
    IV
    Did you have to reprogram the Transmission ECU? Do you know who does the programming besides the dealer?
     
    #24 Wasif Karim, Aug 21, 2019
  5. ChapmanF

    ChapmanF Senior Member

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    Vehicle:
    2010 Prius
    Model:
    IV
    There's nothing special the transmission control ECU needs to know. It will learn how far your park actuator goes in each direction, the first time it's powered up.
     
    #25 ChapmanF, Aug 21, 2019
  6. Wasif Karim

    Wasif Karim New Member

    Joined:
    Aug 21, 2019
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    Location:
    Dallas, TX
    Vehicle:
    2012 Prius
    Model:
    IV
    The reason I asked was two. Toyota Dealer is saying these have to be programmed. They did a diagnostic test on my vehicle and told me the Transmission ECU was bad. I bought a used one off of ebay that came out of a car that was salvaged and plugged it in but I still get the P Lock error.
     
    #26 Wasif Karim, Aug 22, 2019
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