red triangle of death

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by ub2u4me, Feb 5, 2026.

  1. ub2u4me

    ub2u4me New Member

    Joined:
    Feb 5, 2026
    3
    1
    0
    Location:
    92397
    Vehicle:
    2006 Prius
    Model:
    Two
    Hello everyone, i have a 2006 prius that i just replaced 6 battery cells and have tested all the cells twice using a headlight bulb for 5 mins each test, all cells tested at 7.2 volts and higher, my problem is that when i install the battery and put my key phob in the ignition it gives me a red triangle right away and i can't get the motor to run , usually it atarts when i depress the gas pedel a bit . any ideas out there ?
     
  2. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    13,265
    2,395
    0
    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    Yes take some pictures check all your connections is your safety plug all the way in and slammed all the way down into its receptacle that tells it it's in place . Connections at orange cabeling in battery?.. you need a real scan tool like elm 327 n car scanner app.
     
  3. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    27,873
    18,446
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Please post the trouble code(s).
     
    Brian1954 likes this.
  4. ub2u4me

    ub2u4me New Member

    Joined:
    Feb 5, 2026
    3
    1
    0
    Location:
    92397
    Vehicle:
    2006 Prius
    Model:
    Two
    I have a blue driver obd 2 reader , would that qualify ? all the connections are good, orange plug is in all the way and locked down
     
  5. ub2u4me

    ub2u4me New Member

    Joined:
    Feb 5, 2026
    3
    1
    0
    Location:
    92397
    Vehicle:
    2006 Prius
    Model:
    Two
    success i pulled the battery to do my testing, put it back together and installed it, put the key in ,and it started right up , no triangle , i have no idea what i did or why it was acting the way it was but happy to report it's back to normal
     
    Brian1954 likes this.