Slow Smart Key

Discussion in 'Gen 2 Prius Main Forum' started by qmanqman, Jul 21, 2025 at 10:17 AM.

  1. qmanqman

    qmanqman Active Member

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    The unlock feature of my smart key is becoming slower and slower. This morning I had to pull on the door handle 3 times before the door finally unlocked. For a second I thought I didn't have my key on me. Is this a sign the battery is wearing out in the key fob?
     
  2. dolj

    dolj Senior Member

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    Could be. If you test the fob battery with a voltmeter, replace it if it is under 3 volts.
     
  3. Mendel Leisk

    Mendel Leisk MMX GEN III

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    When I'm replacing I've found the outgoing batteries still display quite good voltage, over 3.0 volts. but they are crapping out.
     
  4. bisco

    bisco cookie crumbler

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    fob key, 12 volt, lock motor, in that order