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Replaced hybrid battery - car won’t start

Discussion in 'Gen 2 Prius Technical Discussion' started by paryzekaj, Jul 21, 2024 at 4:10 PM.

  1. paryzekaj

    paryzekaj New Member

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    I replaced the hybrid battery in my 2004 Prius yesterday using a reconditioned battery. Now the car won’t go into gear. I have read through many similar posts online but so far haven’t found a solution. The car does start but that is it. I have no battery or engine codes. When using the Dr Prius app the new battery looks good with good voltage and resistance reading in each module.
    What am I missing? The orange interlock switch on the battery is in place and locked down (I have gone through that one numerous times). The 12v battery is strong and connected well. I feel like I must be missing something? TIA
     
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  2. bisco

    bisco cookie crumbler

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    'the car does start' means you have the ready light?
    have you double checked all the connectors?
     
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  3. ChapmanF

    ChapmanF Senior Member

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    Are there any warning lights on the dash?
     
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  4. paryzekaj

    paryzekaj New Member

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    Yes - Every light is lit up. No codes though, either battery or engine codes.
     
  5. paryzekaj

    paryzekaj New Member

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    I have reseated the orange interlock switch a half dozen time. The car does turn on but it doesn’t shift into gear - just park and neutral. I guess I start some disassembly and reseat all electrical connections. I was going to attach a video but it appears to involved to be worth it. All warning light light up when I start the car and the Red triangle gets added to the mix when I try to shift into gear.
     
  6. paryzekaj

    paryzekaj New Member

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    Just to close this up the car is running now. I took the brackets and trim off the electrical connections side of the battery. Checks all connections and reseated everything on that side. There was a small white wire that goes to the vehicle side of the orange wire connections that was not in position. Put that one back where it belongs and inserted the interlock, connected the 12v battery negative and tried to start the vehicle. It worked so disconnected the negative and interlock and reassembled everything. Reconnected and started the vehicle again. No codes, no warning lights, and drives fine. All’s good now.
     
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  7. ChapmanF

    ChapmanF Senior Member

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    As always, that means the scan tool being used isn't able to show what the codes are.

    We have a thread here that reviews scan tools and apps and identifies some good choices capable of retrieving the codes.

    Gen2 OBD2 app review | PriusChat

    Good find. If a better code reader had been at hand, it would have shown the P0A0D code that might have steered you more quickly in that direction.