Prius Plus not starting / ready Help needed

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by CNP, Mar 26, 2021.

  1. CNP

    CNP New Member

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    Hi this is my 1st post and help is needed. Thanks

    Prius Plus 2012 import, 70k miles

    Tis techstream fault codes shown U0131 (steering control unit) photo added
    No codes on standard diagnostic equipment
    Hybrid Battery around 35%
    12v battery replaced
    Fuses checked.
    Car stood parked for a few months.
    Could be a possible power drain on the car also.
    Tried jump starting also
     

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  2. bisco

    bisco cookie crumbler

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    might be a blown fuse. whar are you getting for voltage at the jump point under the hood?
     
  3. CNP

    CNP New Member

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    When I checked the voltage under the hood. At jump point and fuses. It matched the battery voltage. It was 12.5v last I checked. Battery is drained again.
    The car seems to be draining the 12v battery.
     
  4. CNP

    CNP New Member

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    I have checked fuses under dash and in the engine bay. I may check them again visually and with a multimeter
     
  5. CNP

    CNP New Member

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    Would a power steering control unit stop the car from starting/ready?

    Posted via the PriusChat mobile app.
     
  6. sam spade 2

    sam spade 2 Senior Member

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    Leaving the scanner tool plugged in will drain the battery too.
    You didn't mention recharging the battery manually. Have you done that ?
    New batteries often come half charged or less.
     
  7. CNP

    CNP New Member

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    Hi i do double check to take the scan tool off.
    New battery was 12.1v I manually charged it to 12.9v
    While on charge the hybrid battery seem to be charging up at 0.06v. From 38% to 59% but 12v battery drain to 5v.
     

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  8. CNP

    CNP New Member

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    The pack voltage looks low still
     
  9. TMR-JWAP

    TMR-JWAP Senior Member

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    I think this is the first time I've ever seen a techstream readout from a Plus model.
     
  10. CNP

    CNP New Member

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    Hi the graph is read out from hybrid diagnostic app.
    The codes are from Tis techstream program

    Posted via the PriusChat mobile app.
     
  11. CNP

    CNP New Member

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    The fault may possibly be the voltage sensor unit on the hybrid battery. As Tis could not reset or do a diagnostic on the battery pack

    Posted via the PriusChat mobile app.
     
  12. ZX Nutt

    ZX Nutt New Member

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    My 2012 V will not start if the 12v battery is low.
     
  13. CNP

    CNP New Member

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    I have had the 12v battery over 12.6v of charge and my car still doesn't start

    Posted via the PriusChat mobile app.
     
  14. CNP

    CNP New Member

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    Visually checked the hybrid voltage sensor and plugs for burns marks etc. They look clean 20210328_143743.jpeg

    Posted via the PriusChat mobile app.
     
  15. sam spade 2

    sam spade 2 Senior Member

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    Well yes, that would be pretty much true of almost ANY vehicle.
     
  16. ZX Nutt

    ZX Nutt New Member

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    Correct, but the Prius spins the engine with the 220v traction battery, not the 12v...
     
  17. CNP

    CNP New Member

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    Manually charging the hybrid battery would be nice. It could be the next option.

    Posted via the PriusChat mobile app.
     
  18. bisco

    bisco cookie crumbler

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  19. bisco

    bisco cookie crumbler

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    that would be unusual for a low mile '12 after a few months, but anything is possible i suppose.

    still, if everything else were fine, it should boot right up and tell tis the hv battery is low.
     
  20. sam spade 2

    sam spade 2 Senior Member

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    Yes but the 12 V powers the computers that TELL the engine to start.
    I guess I'm not getting your point.
     
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