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2008 Prius "Park Button" Not Working

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Prius Newby, Jul 13, 2024 at 9:07 AM.

  1. Prius Newby

    Prius Newby Junior Member

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    The Park Button won't engage park (and therefore, disengage?), and when I shift into Reverse or Drive, the transmission almost immediately shifts back into Neutral (as indicated on the digital gear indicator).

    About 10,000 miles ago I drained and refilled the transmission twice with Toyota WS trans fluid. No leaks.

    No odd dash lights are illuminated.

    What is the problem?
     
    #1 Prius Newby, Jul 13, 2024 at 9:07 AM
  2. bisco

    bisco cookie crumbler

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    how is the 12v health?
     
    #2 bisco, Jul 13, 2024 at 1:50 PM
  3. ChapmanF

    ChapmanF Senior Member

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    A scan tool will probably show some C23xx trouble codes. Those would be helpful.
     
    #3 ChapmanF, Jul 13, 2024 at 2:05 PM
  4. Prius Newby

    Prius Newby Junior Member

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    Replaced the 12V battery in March, though haven't measured voltage since this Parking Button problem started yesterday.
     
    #4 Prius Newby, Jul 13, 2024 at 2:41 PM
  5. Prius Newby

    Prius Newby Junior Member

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    I have simple OBD2 reader, will this read the "C" codes you mentioned?
     
    #5 Prius Newby, Jul 13, 2024 at 2:42 PM
  6. ChapmanF

    ChapmanF Senior Member

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    Simple way to find out....
     
    #6 ChapmanF, Jul 13, 2024 at 2:51 PM
  7. Prius Newby

    Prius Newby Junior Member

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    True, it's pushing 100 degrees here so I'll check in the am and report back here.
     
    #7 Prius Newby, Jul 13, 2024 at 9:36 PM
  8. mr_guy_mann

    mr_guy_mann Senior Member

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    #8 mr_guy_mann, Jul 13, 2024 at 10:37 PM
    Brian1954 likes this.
  9. Prius Newby

    Prius Newby Junior Member

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    Update:
    My OBD2 reader didn't indicate any codes.

    Today the parking button is functioning 100% correctly, and the transmission is shifting into gear and staying in gear as it should.

    WTH?
     
    #9 Prius Newby, Jul 15, 2024 at 9:18 AM
  10. bisco

    bisco cookie crumbler

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    get a free load test on the 12v at many auto parts stores
     
    #10 bisco, Jul 15, 2024 at 12:42 PM
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