I just replaced my battery modules...and then...P3012 & P3013 pop up!

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Rodger C., Apr 29, 2020.

  1. Rodger C.

    Rodger C. New Member

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    Okay! So... here's what I did:
    -I swapped my gen3 battery modules (all 28) out with my gen2 prius.
    Why did I do that? Because the cells were going bad. It had trouble codes:
    It gave me the code P0A80 (Replace hybrid battery pack)

    Present time problem:
    - Dashlights came on after letting car run for 10 minutes. Triangle of death,VSC, ABS (the whole nine yards!)
    Note: after troubleshooting my car I got these codes back:
    -P3012 & P3013
    -Block 2 & Block 3 battery becomes weak
    - My fan in the back that pushes air to the battery is running very high even with the car in idle.

    Here's what I did already:
    - I made sure when I swapped the batteries from Gen3 to Gen2 the negatives and positives were in the same position as they were initially (so they are in sequence)
    - I made sure the orange saftey plug is locked in place and down.

    Note:
    -There is corrosion on the metal parts connecting directly to the modules ( but I can't say that's the problem otherwise I would of had these error codes the first time around)
    - Putting the Hv battery pack back together was hell! I made sure everything was perfectly in place and connected, from the wires to each cells perfectly touching.
    - I did not Torque each nut onto each terminal. I did it very tight using a ratchet. Definitely NOT loose.

    I've been going at it for 3days... I'm stumped. I've dug through threads.


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  2. George W

    George W Active Member

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    I'm guessing your Gen 3 did not have any of these codes when you pulled its pack? However, the mention of corrosion is a dead giveaway. You need to clean that s*** off. Pull the wires off of your terminals, and get some baking soda and a toothbrush after them. Soak your busbars, remove that corrosion. You need clean connections.
     
    #2 George W, Apr 29, 2020
    Last edited: Apr 29, 2020
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  3. Rodger C.

    Rodger C. New Member

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    Right, the Gen3 didn't have any of these battery codes. Okay, I'll clean those off first thing tomorrow. I'm gonna check for cracks or damage and clean them. If this works, then I'm set!
     
  4. dolj

    dolj Senior Member

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    Out of interest, what app are you using to read the codes?

    I don't know if it matters, but the numbering convention of the block/modules is opposite in a Gen 3 from a Gen 2. Gen 2 are numbered like this:
    Prius Gen II HV Battery module ID.png

    On a Gen 3, they start at the left (ECU) side and count up to the right.
     
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  5. 05PreeUs

    05PreeUs Senior Member

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    Yes to all the above, PLUS get that 12v charged! At 11.8v it is basically completely dead.
     
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  6. Rodger C.

    Rodger C. New Member

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    -I'm using the HT200 (A bluetooth OBD2 reader by Hyper Tough)
    - I just got done cleaning the corrosion off and I just used an inch pound torque ratch and torqued them at 48in. Same for the terminals that connect the huge orange cables to the modules

    I'm gonna see if anything changes... might have to redo the whole thing and put them in correct order like you suggest. How do I pinpoint the module that is supposed to be closest to the ECU? and then furthest?
     
  7. dolj

    dolj Senior Member

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    I was meaning the relationship of what you see in your OBDII reader to how the blocks are laid out physically in the battery. When it says block 1 on a Gen 2 this is the 2 modules furthest from the ECU. When it says block 1 on a Gen 3 this is the 2 modules nearest from the ECU.

    If you wanted to make it like the factory, you would go from the lowest serial number to the highest, I guess.
     
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  8. Rodger C.

    Rodger C. New Member

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    UPDATE:
    - The error codes I got about Block to and Block 3 were resolved!

    What I did:
    - Cleaned corrosion off the Orange Harness that connects to each battery module terminal. There was a lot of acid corrosion on the copper bus bar plates.
    - As a safe measure, I used an inch pound torque wrench and torqued all the nuts connecting to each terminal on all 28 modules at 48in on the torque wrench. Same for the positive and negative terminal.

    The car is running great!
     
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  9. Rodger C.

    Rodger C. New Member

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    Good point on the serial numbers, I noticed those afterwards lol
    But what I did do when I assembled the pack was I took the batteries closest to the ECU of the Gen3 and put those batteries closest to the ECU of the Gen2... Hopefully it doesn't come back to bite me in the butt
     
  10. George W

    George W Active Member

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    I am happy that you got that resolved. Clean connections makes such a difference in the Prius.

    I would also take 05PreeUs' suggestion and consider having your 12V battery Load-tested. It's cold resting voltage should be at least 12.6V or higher
     
  11. 05PreeUs

    05PreeUs Senior Member

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    So how was it, the feeling of earning YOURSELF about $1000/hr!???!!!
     
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