B2799-539 Code

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by TwoPriusInTenn, Oct 1, 2025 at 10:33 PM.

  1. TwoPriusInTenn

    TwoPriusInTenn Member

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    I replaced the HV ECU in my daughter's 2008. We have done the 4 and 13 jumper wire trick, but still the engine will not start. Next step suggestions welcomed.
     
    #1 TwoPriusInTenn, Oct 1, 2025 at 10:33 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    spins but no start? Is it sposed to be starting running?
     
    #2 Tombukt2, Oct 2, 2025 at 7:03 AM
  3. Brian1954

    Brian1954 Senior Member

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    Is this the same car that you created a thread about on September 6th?
    https://priuschat.com/index.php?posts/3563003
     
    #3 Brian1954, Oct 2, 2025 at 9:14 AM
    Last edited: Oct 2, 2025 at 9:29 AM
  4. TwoPriusInTenn

    TwoPriusInTenn Member

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    #4 TwoPriusInTenn, Oct 2, 2025 at 4:05 PM
  5. saneesh8

    saneesh8 Member

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    #5 saneesh8, Oct 2, 2025 at 5:04 PM
    TwoPriusInTenn likes this.
  6. TwoPriusInTenn

    TwoPriusInTenn Member

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    Thank you.
     
    #6 TwoPriusInTenn, Oct 2, 2025 at 8:29 PM
  7. TwoPriusInTenn

    TwoPriusInTenn Member

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    I have done a paperclip in pins 4 and 13 again. Dashlights flicker. Did this procedure for 30+ minutes and turned it off. Took out jumper and key. Waited 5 minutes. Inserted key and pushed start button. Lights are solid. Triangle is still there. No start.

    I did not replace the Engine ECU, just the HV ECV and converter/inverter.

    Should I call a locksmith and have the fob reprogrammed?
     
    #7 TwoPriusInTenn, Oct 4, 2025 at 12:32 PM
    Last edited: Oct 4, 2025 at 1:39 PM
  8. TwoPriusInTenn

    TwoPriusInTenn Member

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    UPDATE: Current status- With car in ready. The engine fired with jumper in pins 4 and 13 and key fob in. Will not start without jumper. I will try a couple more times.
     
    #8 TwoPriusInTenn, Oct 4, 2025 at 2:26 PM
  9. TwoPriusInTenn

    TwoPriusInTenn Member

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    It's running!!! After about 4 tries. The fob is sync'd.

    Now it is displaying the following codes:

    C1310
    POA08-264
    POA08-591
    PXL_20251004_203733114.jpg PXL_20251004_191325920.MP.jpg PXL_20251004_191228904.MP.jpg
     
    #9 TwoPriusInTenn, Oct 4, 2025 at 4:54 PM
  10. ChapmanF

    ChapmanF Senior Member

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    Yay progress!

    Search around for threads about your P0A08 and P0A09 codes. They pertain to a simple signaling circuit between the HV control ECU and the DC/DC converter, and there's information in other threads about troubleshooting that.
     
    #10 ChapmanF, Oct 4, 2025 at 5:05 PM
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