Quick flash of red triangle and beep sound

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Dahvid, Apr 17, 2026 at 8:01 PM.

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  1. Dahvid

    Dahvid Junior Member

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    Hello all.

    2008 prius 167k
    Battery not in the greatest shape just under 60% state of charge.

    I've just noticed in the last couple of days that the red triangle just comes on for a second like a blip and the beep sound but then gone.

    I used dr prius and there's no codes

    I heard just the beep yesterday and thought it was the passenger airbag sensor bc I had some stuff in the seat but today I happened to be looking down and saw the triangle illuminate for just a split second and then off. Used dr prius and no codes


    Any thoughts? Thank you
     
    #1 Dahvid, Apr 17, 2026 at 8:01 PM
  2. ChapmanF

    ChapmanF Senior Member

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    Were you accelerating, stopping, or turning a corner at the time of the flash and beep?
     
    #2 ChapmanF, Apr 17, 2026 at 8:10 PM
  3. PriusCamper

    PriusCamper Senior Member

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    A quick triangle flash when starting up the car and no error code is usually a near dead 12v battery that needs a heavy charge or replacement.

    A quick triangle flash when hard braking, accelerating or turning a sharp corner fast with no error code is usually because you're two quarts low on oil.

    How's your MPG? How many miles on car? Are you behind on regular maintenance?
     
    #3 PriusCamper, Apr 17, 2026 at 8:11 PM
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