NEED HELP ASAP. Replaced water pump and still won’t start

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Jrjunior03, Dec 5, 2021.

  1. Jrjunior03

    Jrjunior03 New Member

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    11/11/21- I was out for a drive and the check engine and check hybrid system error popped up and car stalked. Got it towed home. Sat around for 2-3 weeks until I figured out what to do.
    11/30/21- purchased the innova Bluetooth ODB2 code reader. Check code:p261b water pump malfunction
    12/4- installed new water pump and coolant. Watched plenty of videos especially the Aisin vendor video on YouTube. Referenced this site for support info as well. Install appeared to go smooth. Coolant flush and refill went without a hitch.
    Attempted to do the maintenance mode steps but car won’t go into ready state. Ran the code reader again and the report showed the 12v battery at 11.25v
    Put the car in self function test and the check signal button shows 12v at 11.6v
    The car lights and dash turn on no problem and don’t seem to dim out. Tried to “jump start” battery hoping to charge battery up to 12v with no success.
    Details:
    2013
    226,000 miles
    Just replaced coil packs/head gasket/spark plugs early this year ($1500)
    4brand new tires ($400)
    Just installed new water pump($250)
    Just wondering if it’s worth spending almost another $250 on the 12v battery to not know if this will fix my issue. Current battery has a sticker saying 12/19 assuming that’s the manufacture date. So battery should still be good right?
     
  2. ChapmanF

    ChapmanF Senior Member

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    You haven't said anything about codes except for the :p261B before you did the pump replacement?

    Your aux battery is low on charge, but not low enough to stop you from reading current codes to find out why your car is choosing not to go READY.

    [​IMG]

    That's what would be my next step, before shotgunning parts. Generally when the car decides not to go READY it will be happy to tell you why. As you observed yourself, $250 would be quite a bit to spend on a shotgunning approach.
     
  3. Jrjunior03

    Jrjunior03 New Member

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    Here is the check engine code and “needs attention” codes according to the report
     

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  4. Jrjunior03

    Jrjunior03 New Member

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    These were the codes just prior to replacement.
     
  5. Jrjunior03

    Jrjunior03 New Member

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    These are the codes after replacement and trying to put it in maintenance mode.
     

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  6. ChapmanF

    ChapmanF Senior Member

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    You have a current P0A0D. That hybrid system interlock will prevent the car from starting.

    If the service plug on the traction battery was ever removed for any reason, not getting its handle completely reseated is a common P0A0D cause. If that's not it, there are other interlocks in the inverter wiring covers, but those are less commonly disturbed. And of course the wiring needs to be checked, if there's nothing amiss with the interlock contacts.

    You still have a 'permanent' :p261B code, but that will go away as soon as the car is operational again for long enough to figure out that the pump now works.
     
  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    That voltage is very low. Wouldn't hurt to try a charging session, with a 3~4 amp smart charger, but probably replacement time.
     
  8. ChapmanF

    ChapmanF Senior Member

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    The voltage is above Toyota's threshold for retrieving codes, and the P0A0D code shown in current status is the car saying right out loud, "hi! I am not going to start, because you have left the safety interlock circuit open, and I am programmed not to start then."
     
  9. Jrjunior03

    Jrjunior03 New Member

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    I have unhooked and reseated the safety interlock and it clicks in and everything. So would it be safe to say since the battery is roughly over 3 years old it’s probably time to replace it. I did have to jump the car once back in October.
     
  10. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Look into 12 volt digital battery testers.

    https://www.autoguide.com/top-10-best-car-battery-testers

    I have a Solar BA5 (older model); see there's a Solar in the above list. Works well.
     
  11. ChapmanF

    ChapmanF Senior Member

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    After doing that work, have you re-read the codes, and do you or do you not still have a current P0A0D?

    The interlock circuit, which runs from the power management control ECU, through the inverter, back through the wiring harness, to the battery service plug, and to body ground from there, is a very simple electrical circuit. If the code about it has gone away, then that particular issue is resolved now. If the code about it is still present, there is still a discontinuity in it somewhere, and the P0A0D code will be present until you find and correct that. While there's nothing wrong with replacing your battery if you want to, as long as you have a way to keep the current one reasonably charged, that's as much as you need while tracking down where the interlock circuit is open.
     
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