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P0A80 and P3021 codes, multiple issues, advice needed

Discussion in 'Gen 2 Prius Technical Discussion' started by Bobdallama, Apr 9, 2019.

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  1. Bobdallama

    Bobdallama Junior Member

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    2007 Prius
    Model:
    ----USA----
    Hi All!

    So, I have a 2007 with 246k miles. Everything has been great, I'm the second owner, and put about half of those miles on it myself. Only issues I've had were easily remedied - around 200k had a MAF sensor gunked up and got it cleaned. Then the water pump pulley seized and tore up the serpentine belt around 220k. All were straightforward fixes and comparatively inexpensive.

    Then this past weekend, went to drive it and got the Red Triangle, VSC, Brake system light, and check engine light, along with error code P0A80. Voltage reading via Torque showed that all blocks read 16.0-16.1 except block 11, which read 14.8.

    So, a friend had a spare battery that he had purchased for a flooded Prius but wasn't able to use. I swapped out the entire battery for his, but it was in even worse shape. Voltages were all over the map, and the engine would never even start. So then I put my battery back in - at least I could get the car running with my battery.

    On my way home from my Dad's (he's got the garage and everything), had some serious problems. on the way to Dad's I was able to maintain speed with traffic, but on the way back, the car wouldn't get up to speed. The cooling fan ran on full blast non-stop, and it felt like the throttle was stuck around 25%, but mushy, if that makes sense. Then I pulled another code (P3021) which seems to be pointing at block 11 again.

    So...to my question(s):

    1.) Are my initial findings correct, that it is just block 11 that has gone bad and is causing all these problems?

    2.) If so, how reasonable is it to replace just that module? any thing I need to know before doing that?

    3.) Is there any chance that I've done damage to other components (the rest of the HV Battery, or the ICE) by driving it like I did?

    4.) Is it even worth putting more time and money into a car with 250k miles on it?

    thank you guys so much for any advice you might have. I'll be happy to provide any additional info that might help.
     
    #1 Bobdallama, Apr 9, 2019
  2. davecook89t

    davecook89t Senior Member

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    If you've already swapped the battery a couple of times, it seems that you have the tools and skills to keep the car on the road, until you get tired of playing "whack-a-mole" with the modules, as it's commonly called. To get more than a few months out of the car after replacing the worn-out module, it is recommended that you do several cycles of charging and discharging of the entire pack to equalize the capacity of the modules using something like the Prolong system sold by the member of this forum @jeff652. I don't think you have done any further damage by continuing to drive the car in the short time since the battery has started to give you problems. Your course of action will be determined by how essential this car is to meeting everyday transportation needs, how much time and money you have to fix it, and how much you generally trust this particular car to get you where you need to go.
     
    #2 davecook89t, Apr 9, 2019
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  3. Bobdallama

    Bobdallama Junior Member

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    2007 Prius
    Model:
    ----USA----
    @davecook89t thanks for the reassurance. I think I'm up for a few rounds of whack-a-mole. my main concern is pouring money into a vehicle that may not be long for this world, but considering the cost v risk seems to point me towards replacing an individual module.

    so, next question - is it easier to replace a single module, or to replace a block (since they seem to operate in pairs). I was ok with swapping a battery, as it wasn't really that difficult, but opening up the battery and swapping modules intimidates me a little. just don't want to get in over my head.
     
    #3 Bobdallama, Apr 10, 2019
  4. davecook89t

    davecook89t Senior Member

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    I guess the usual words of caution are in order, such as wearing Class 00 Electrical Insulating Gloves,
    , and being sure to remove the orange service plug before opening the battery case.

    Otherwise, if the individual modules look Ok (no leakage of battery fluid, no deformation of their casing, etc.), I would put a Multi Meter along with a load (perhaps a DC light bulb) on each one of them, to test their capacity, and replace any that appear weak. It may turn out that the only one that needs to be replaced is one of the two in Block 11.
     
    #4 davecook89t, Apr 10, 2019
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  5. ericbecky

    ericbecky Hybrid Battery Hero

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    If you managed to swap the big battery, you will be able to do the modules within it.

    Please use an inch-pound torque wrench when reassembling the 8mm nuts and bolts on the modules and contactors. You do not want to snap a post or leave them too loose to cause arcing.
     
    #5 ericbecky, Apr 11, 2019
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