Red Triangle, VSC, Chekc engine, brake - all lit up

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by R1001R, Aug 3, 2020.

  1. R1001R

    R1001R New Member

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    I got in the car this morning, drove about 150', and the Red Triangle, VSC, Check engine, brake icons all lit up. I know nothing is overheated, but what's up? All was fine last night.
    I have no codes yet, but looking for a little direction before I spend a lot of $$ to get it checked.
    More info: The hynrid battery has been draining more lately, but it still charges to max level after sometimes. The A/C works fine. After I left the house this morning and things lit up I went to work, stopping at the store. After that there was only the red triangle and check engine light. Oil, water, etc seems to be fine. I replaced the tranny coolant oil about 5-6 months ago. Ideas?
    Thanks-
     
  2. bisco

    bisco cookie crumbler

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    welcome!

    how many miles on her?
     
  3. PriusCamper

    PriusCamper Senior Member

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  4. R1001R

    R1001R New Member

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    ~233k miles on it. he hybrid was (supposedly) changed around 160k.
    I did a battery check and getting 19.9V Is that a bit low, maybe causing other problems?
     
  5. PriusCamper

    PriusCamper Senior Member

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    Sounds like something went wrong with your battery check... You should be closer to 12v than 19.9v... I think your volt meter is messed up.
     
  6. R1001R

    R1001R New Member

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    Sorry- typo... voltage was 11.9V
     
  7. PriusCamper

    PriusCamper Senior Member

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    Yeah... That's a dead 12v battery problem for sure... You can try recharging, but most likely will have to replace.
     
  8. ChapmanF

    ChapmanF Senior Member

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    Where/how did you do the "battery check"?

    The vehicle signal check screen on the MFD reads low on all the cars I've checked (it is probably an accurate reading of the volts arriving at the MFD, low enough that if I happened to see 11.9 there I wouldn't give it a second thought. It won't stop you reading the trouble codes if you have a way of doing that. (For brake system codes, you always have a way of doing that, because they have a blink-out-on-the-dash feature you can trigger.)
     
  9. PriusCamper

    PriusCamper Senior Member

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    To be clear, do this 12v battery check and let us know results:

     
  10. R1001R

    R1001R New Member

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    The 11.9V reading was through the MFD. I just did it again and it read 12.3, and when I pressed the power button again to go into full Ready mode it dropped to 12.2, then after a couple of seconds dropped again to 12V.
    After doing what PriusCamper suggested ("Here's a minor load:")
    Car off, voltage at jump point: 12.9
    Car off, headlight on high beam for 5 min, then wait a minute: 12.8
     
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  11. bisco

    bisco cookie crumbler

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    12v sounds okay, time for codes

    who installed the hybrid battery, is there a warranty?
     
  12. edthefox5

    edthefox5 Senior Member

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    Do you see the icon of a car in the upper left corner of the mfd the screen above the radio. If so the hybrid battery has failed.

    very very common on this site G2 hybrid batterys failing left and right. High mileage car driven daily all of sudden you hardly drive it at all battery doesn't get charged. Its death for the hybrid battery and usually the 12 volt too. The car is so complicated even a bad 12 volt battery is a head scratcher. Most cars you hear the engine turn over slow yep its the 12 volt. Not on a prius.

    I'm afraid your hybrid battery failed its the #1 post on this site. Based on the 11.9 the 12 volt is looking for the exit door too.
     
  13. R1001R

    R1001R New Member

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    There's an icon of a car in the upper left of the MFD- it's green. They hybrid battery was (supposedly) replaced- told to me by the guy I bought it from, and he was told by the guy HE bought it from, so....
    I drive this car a lot. I drive a little over 30k miles a year, so this gets a lot of drive time, almost every day.
    It has about 233K miles on it, uses a quart of oil a month, but still gets about 40-42mpg going 80mph on the freeway. If something goes south I'll move on to another used one.
     
  14. edthefox5

    edthefox5 Senior Member

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    ,it’s not just charging behavior lots of times there may be a micro cracked leaking battery module in the battery case it makes a mess of corrosion and starts to conduct and throws a grounded fault. See that often.

    You know if it’s a ground fault if you can disconnect the 12 volt battery wait a bit then reconnect it that will clear the codes and allowyou to drive some more till it launches the RTOD again.

    Letting it sit will also excite corrosion on an old battery.
     
  15. R1001R

    R1001R New Member

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    So I can disconnect it while at work? How long do I keep it disconnected? The possible corrosion you're talking about will be around the 12V battery?
     
  16. Moses Bruh

    Moses Bruh Member

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    Was the engine oil dipstick indicating closer to low mark or high? There has been a known issue that with engine oil closer to the Low mark, marking turns can cause oil starvation to the engine and it can throw all the brake codes up.
     
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  17. dolj

    dolj Senior Member

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    The 12 V battery is fine. Move on, nothing to see here.
     
  18. R1001R

    R1001R New Member

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    Get codes from the MFD, or...?
     
  19. edthefox5

    edthefox5 Senior Member

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    yeah dolj Having owned my car 13 years and on my 3rd 12 volt battery what would I know about it?

    11.9 is not good on a Prius. healthy prius battery lives at 12.6.
    if you had a battery re conditioner I would use that.

    Yes you can disconnect it at work. 2 different ways one is unbolt the ground lead off the car chassis not recommended as there will be sparks the other is pry off the red plastic battery cover and there is 2 black leads plugged in that black plastic assy on top of the battery. The
    big fat lead is the main B+ lead that's bolted to the front jump point under the hood. Those 2 lead plugs juts unclick by depressing there little levers and gently pulling out. Wait a minute then gently re-insert. Then re-insert they will click.
    The red stuff all over everything is 100% synthetic grease to prevent corrosion. Works great.
    The extra red lead on the 12 volt terminal is for a towing light aux power supply.

    Sometimes after you restart the car it will show alot of codes that's ok just shut the car off and start again there will be no codes. The cars system freaks out when the 12 is disconnected.

    This 12 volt reboot will clear all the codes the car has launched. if you can drive ok after that you may have a ground fault issue with the hybrid which is very very common. It will re-launch the code again though after a while somtimes fast sometimes takes days.
     

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    #19 edthefox5, Aug 6, 2020
    Last edited: Aug 6, 2020
  20. R1001R

    R1001R New Member

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    Thanks! I'll get that done today.
     
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