2010 Prius p0a80 I Replaced the hybrid but still won't run on battery

Discussion in 'Gen 3 Prius Main Forum' started by Simonphelps, Oct 2, 2020.

  1. Simonphelps

    Simonphelps Junior Member

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    2010 Prius
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    Trying to explain this in as simple of a way as possible.

    A few weeks ago my 2010 Prius (115k miles) had the error "Check Hybrid System". This came off the heels of the car stalling a few days before when accelerating from a stopped position. It had also been giving me trouble when accelerating and was giving a delayed response on more than one occasion. I looked into the manufactures recall I recently got in the mail and realized this problem was due to a software update. I did this and to play it safe, hoping for a less expensive fix, I replaced the 12v. After doing this the "Check Hybrid System" went away. (I assumed this was from unplugging the battery and this caused the error to erase) I continued to drive the Prius and pretended everything was ok. I hoped this was the problem. After driving the car for 3 weeks the same thing popped up "Check hybrid system" This time I took it in and was told the hybrid battery needed to be replaced. One thing I notice is the car had stopped running on the hybrid battery. At this point it wouldn't turn off as I sat at traffic lights and wouldn't run on the Hybrid when I was accelerating gently at low speeds. (or any other time it use to kick on)
    I bought a hybrid battery and installed it just last night and I drove it around for 10 minutes. I noticed the "Check Hybrid System" was still on. Is this because the error code needs to be cleared?

    Secondly I noticed the car still refused to run on electric. I don't know a lot about Prius' but my thought was when the Prius thinks that the hybrid battery is bad it automatically stops using the hybrid. Perhaps this is why my car showed the hybrid battery as fully charged after driving for about 10 minutes but still wouldn't use it. Could this be because the code is still registered in the car and some sort of smart fail safe system is keeping it from being used?
     
  2. Simonphelps

    Simonphelps Junior Member

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    III
    update: I detached the 12v battery for 30 minutes and after reattaching "check hybrid system" isn't displayed. It also starting running on hybrid battery power as soon as the car powered up. This is something it wouldn't do before. I wonder if this means there is something else that is a problem.
     
  3. Solar Blue

    Solar Blue Junior Member

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    Have you scanned it for codes?
     
  4. royrose

    royrose Senior Member

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    The way I read what you are saying, the vehicle is running properly now. If it keeps doing that, you have cleared the "limp mode" and are good.

    Did you buy a new Toyota hybrid battery or a "reconditioned one? What did you pay?

    If I were you I would get an OBDII bluetooth enabled adapter (that plugs into the diagnostic port under the dash) and run the Dr. Prius app to assess whether your new battery is running properly and whether there are any codes.
     
    Threej likes this.
  5. Tom martin

    Tom martin New Member

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    ----UK----
     
  6. Tom martin

    Tom martin New Member

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    If you don’t clear the code it will not run on the hybrid battery, even if the replacement battery is good, I have been repeatedly clearing the code on my 2010 prius180000 ml, anyway I was due an mot and it would not pass with code showing, I bit the bullet and had a new battery fitted today, main agent £1638 fitted, the car now drives like new. And if I decide to sell it having a dealer fitted new not reconditioned will help sell.
     
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