FOB Not Working & P0A1D, U0100, U0293

Discussion in 'Gen 2 Prius Main Forum' started by Tony Lucas, Oct 24, 2018.

  1. Tony Lucas

    Tony Lucas Junior Member

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    Hellow Prius Friends. I've seen and fixed most of the Prius codes - but this is a new one. Nothing seems really wrong with the car, except I can't start the car with the push button. I have to put the FOB in the slot by the steering wheel. These are the error codes on my App - P0A1D, U0100, U0293
    Any ideas?
     
  2. bisco

    bisco cookie crumbler

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    fob battery? 12v?
     
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  3. Tony Lucas

    Tony Lucas Junior Member

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    The 12V could be the issue? So, look at the 12v and then re-read the codes? Should I re-charge the 12v?
     
  4. bisco

    bisco cookie crumbler

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    how old is it? test it in the morning with a volt meter, then charge it if it is below 12.5
    if it won't hold, replace it
     
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  5. Tony Lucas

    Tony Lucas Junior Member

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    The car is 2006. The 12v is at least 5 years old. I'll recharge it. I tried looking at old posts - some talked about a computer, but there are so many computers on the car, I didn't know what to go after.
     
  6. bisco

    bisco cookie crumbler

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    low hanging fruit. if it is not the 12v or fob battery, you will have to look up the codes in the service manual.
     
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  7. SFO

    SFO Senior Member

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    Do you have the associated INF(s) or subcode(s) for that thrown DTC P0A1D, there are over 20 INF's for this DTC.

    Knowing which INF (subcode) can help efficiently track down a problem. You may need access to a compatible OBD2 device to retrieve such.

    Here is the work up for DTC U0100 and DTC U0293:

    https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/20zmw/ciu0100.pdf
     
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  8. Tony Lucas

    Tony Lucas Junior Member

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    I have Toyota Techstream on my computer, I'm assuming that will show an INF Subcode.
    What would be an example of the INF Subcode?
     
  9. SFO

    SFO Senior Member

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    Yes, techstream will work perfectly. INFs (subcodes) follow a three digit format, like "143".
    .
    Check in the scan results for an flower like icon between the 'Monitor Status' and the 'DTC' columns, click it.

    Below is an image with a DTC (P312F) circled in red, to the left of that is the icon you're looking for.

    [​IMG]
     
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