Car wont start after hybrid/traction battery replaced

Discussion in 'Gen 2 Prius Technical Discussion' started by kenlav, May 19, 2025 at 11:09 PM.

  1. kenlav

    kenlav Junior Member

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    I replaced my gen 2 prius with a new oem hybrid battery, and now it lights up but wont start. im pretty sure i did everything correctly but.. well idk.. the obd tool i use connected, but wouldnt read any codes.

    here is what the dash looks like.
     

    Attached Files:

    #1 kenlav, May 19, 2025 at 11:09 PM
    Last edited: May 19, 2025 at 11:43 PM
  2. dolj

    dolj Senior Member

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    What OBD tool do you use? Do you have power on the OBDII port's pin 16? Posting the codes you have would definitely help. For example, if you were to post you had P0A0D, we could advise you to check whether the service plug grip has been installed properly. Most people fail to complete step three, for some reason.

    Prius Gen 2 Safety Interlock.jpg
     
    #2 dolj, May 20, 2025 at 3:41 AM
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  3. ColoradoCrow

    ColoradoCrow Senior Member

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    When you press the start button do you hear the 2 clicks of the relay by the traction battery? For sure check the safety tab as Dolj suggested.
     
    #3 ColoradoCrow, May 20, 2025 at 9:40 AM
  4. kenlav

    kenlav Junior Member

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    #4 kenlav, May 20, 2025 at 12:37 PM
    Last edited: May 20, 2025 at 1:35 PM
  5. kenlav

    kenlav Junior Member

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    #5 kenlav, May 20, 2025 at 12:42 PM
    Last edited: May 20, 2025 at 1:35 PM
  6. kenlav

    kenlav Junior Member

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    I dont know exactly how the "clicks" sound, but i do hear some noise which could be interpreted as 2 clicks. However the car doesnt start/get into ready mode after that. On the screen it shoes the traction battery has 60% charged, which im not sure if its a current reading, cause the old battery was always purple.
     
    #6 kenlav, May 20, 2025 at 12:44 PM
  7. kenlav

    kenlav Junior Member

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    Ive checked the orange safety tab already for 5-6 times and as far as i can tell its 100% seated. As for the OBD scan tool It doesnt read at all. It connects fine the obd tool lights up as usual, but no codes/cant read. Its a veepeek cheap one, but it always worked before. The only thing is i let the 12v battery die and im currently trying to trickle charge it. Im not sure if thats the cause, since the car and dash lit up.

    also wanted to add, i followed ALL the plugs and instructions exactly. i took pictures of every plug/section from multiple angles, the plates, pins, etc. and put everything back, i assumed 100% correctly. I double checked everything with pictures, before and after assembling each part. Im not saying i didnt make a mistake with that part, but if i think i did well in reassembly.
     
    #7 kenlav, May 20, 2025 at 1:35 PM
  8. dolj

    dolj Senior Member

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    So you're saying you've slid the handle downward firmly until it clicked into the lock position? There is no wiggle?

    If so, have you tested the continuity of the leads going into and out of the switch that the service plug activates when in the locked position? The little connector there often gets forgotten. It's an easy thing to forget.
     
    #8 dolj, May 21, 2025 at 1:01 AM
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  9. kenlav

    kenlav Junior Member

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    genuinely apologize. it was exactly the orange service grip plug, i feel like and idiot. Car runs absolutely perfect and my OBDII reader wasn't reading codes, because there were ZERO codes.

    on the other hand, the reason me (and so many others) miss step 3 i believe is because in STEP 2, the part actually does CLICK and DOES move DOWN about half an inch... so I/we didn't realize it had to go down TWICE.

    Thank you all for the help.
     
    #9 kenlav, May 21, 2025 at 12:17 PM
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  10. ColoradoCrow

    ColoradoCrow Senior Member

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    Hey Man.. All good. At least it is fixed. Last time I pulled my battery out. I misplaced the left rear anchoring bracket..Lost it in my garage of parts. I put everything in a box that was labeled...and somehow I put that bracket in an empty cooler next to the box... Didn't find it for 3 months until I moved and needed the cooler.....:rolleyes: Face PALM...................................for weeks.:whistle:
     
    #10 ColoradoCrow, May 21, 2025 at 12:23 PM
  11. mr_guy_mann

    mr_guy_mann Senior Member

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    You should look at getting a better scantool. If the interlock wasn't seated, then there was a code set. It just wasn't in the ECM (which is the only ecu that many cheap devices can read).

    Look at the sticky thread at the top of the forum - it's a review of several scantool apps and devices. The summary is at post 37.

    Posted via the PriusChat mobile app.
     
    #11 mr_guy_mann, May 21, 2025 at 1:56 PM
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