2007 Prius: Red Triangle + ABS + Engine Check lights :(

Discussion in 'Gen 2 Prius Main Forum' started by Lindsay Mathieson, Nov 22, 2025 at 6:45 AM.

  1. Lindsay Mathieson

    Lindsay Mathieson Junior Member

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    Location:
    Brisbane, Australia
    Vehicle:
    2007 Prius
    Model:
    N/A
    While driving - close to home fortunately, made it back.

    Have run Toyota Techstream to pull the codes, got the following:

    Hybrid Control:
    • P0A08
    • P3102
    • B2799
    ABS/VSC/TRC
    • C1241
    Air Conditioner :)
    • B1421
    • B1476
    Gateway:
    • B1210
    Quite the list :(

    From my somewhat naive searching, I'm wondering if its the 12 volt battery that's the problem? Is it worthwhile just replacing it as a start before panicking? Same battery from when I purchased the car in 2023

    175k KM on the clock.
     
    #1 Lindsay Mathieson, Nov 22, 2025 at 6:45 AM
  2. Brian1954

    Brian1954 Senior Member

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    Model:
    III
    If you have a volt meter, use it to measure the 12v battery. Check at the battery terminals and at the jump point under the hood with the car off. Also, check when the car is Ready (on).
     
    #2 Brian1954, Nov 22, 2025 at 9:11 AM
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  3. priumium

    priumium Member

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    All questions should by default be answered with:

    As a person who do not wish to pay for fault codes (since posting here) to any mechanic without any knowledge of the actual issue; get a Bluetooth 4 OBD2 dongle, such as vlink or similar, read the codes from your phone.

    Note to all; This tip may be outside the scope of what Toyota recommends…
     
    #3 priumium, Nov 22, 2025 at 9:40 AM
  4. Hayslayer

    Hayslayer Active Member

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    OP wrote:
    Have run Toyota Techstream to pull the codes, got the following.

    That is just slightly better than any phone app you're going to find............
     
    #4 Hayslayer, Nov 22, 2025 at 10:04 AM
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  5. highmilesgarage

    highmilesgarage Active Member

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    lol, why would you use a phone app when you have techstream.. sometimes you have to think before posting..

    P3102 is hinting a weak 12v battery and did you check your inverter coolant pump?
     
    #5 highmilesgarage, Nov 22, 2025 at 10:12 AM
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  6. Hayslayer

    Hayslayer Active Member

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    sometimes you have to think before posting..

    very good advice, I'm just not sure how that applies to my post
     
    #6 Hayslayer, Nov 22, 2025 at 10:18 AM
  7. Lindsay Mathieson

    Lindsay Mathieson Junior Member

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    Didn't think to check the Inverter Coolant pump, I'll check in the morning. Probably just replace the 12v battery as well - any decent battery will do?

    Thanks!
     
    #7 Lindsay Mathieson, Nov 22, 2025 at 10:56 AM
  8. Brian1954

    Brian1954 Senior Member

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    III
    Do you own a volt meter??? See post #2.

    You could have a bad inverter assembly or a blown fuse. If so, buying a new 12v battery would be a waste of money.
     
    #8 Brian1954, Nov 22, 2025 at 2:34 PM
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