Brake Light, ABS Light & Traction Control Light are on

Discussion in 'Gen 3 Prius Technical Discussion' started by danjag, Jan 28, 2019.

  1. danjag

    danjag Junior Member

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    My wife took our 2011 Prius III a few miles down the road this morning and 3 warning lights came on; Brake, ABS & Traction Control.

    I took it for a drive a few hours later and found, in addition to the warning lights, the regenerative braking system wasn't working. I had only the normal brake system. I didn't notice any other conditions.

    I left it out in the driveway and let it run for about an hour. Afterwards, the warning lights were still on, but I took it for another drive. Everything returned to normal just a few feet out of the driveway.

    Leading up to this morning's event, the car sat unused and in the garage for 4 days. The temperatures have been dipping into the single digits at night. Additionally, there is a puddle of melted snow (mixed with road salt) on the garage floor, beneath the front end of the car.

    I suspect that the extreme cold, along with the moisture, may have affected the braking system.

    Can anyone confirm if my suspicions are correct, or do I have a more serious condition on my hands? I can't find my OBD Reader and I don't quite trust my local dealership enough to think I would get an honest diagnosis.
     
  2. Eddie25

    Eddie25 Member

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    It's probably a connection to a wheel speed sensor, or a sensor itself. I had the exact thing happen when I replaced a front wheel well splash shield and didn't route the cable for the sensor correctly. I wiggled it around and routed it better and it's never happened again.
     
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  3. ChapmanF

    ChapmanF Senior Member

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    Without an OBD reader, you can still read the brake/ABS/traction trouble codes (in abbreviated form) by taking a short wire between the Tc and CG terminals on the OBD connector, and counting light blinks. (You can find other threads with the details if you search.) If you post those codes, we may be able to reach some conclusions.
     
  4. danjag

    danjag Junior Member

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    Ohhh. I am currently missing a wheel well splash shield. Thank you Eddie25.

    ChapmanF, thank you. I've never heard of doing that.
     
  5. Eddie25

    Eddie25 Member

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    There's a connector up inside the wheel well that continues down to the sensor behind the rotor. It's pretty much exposed without that splash shield and I'll bet you that's been affected by the weather/snow. I'd fiddle with it and maybe use some wd40 before replacing that splash shield... but I'm no mechanic (I'm also going off memory here). At least get that shield replaced, I got an after-market one for like $30 then you need the clips and stuff, but it wasn't that bad.
     
  6. ca3799

    ca3799 Junior Member

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    I came here to investigate this same problem. I've already been to a local, non-specialty, non-dealer shop once for the problem a few days ago and they couldn't find anything wrong so they "reflashed the system" (their words).

    I did bottom this car out pretty hard a couple of weeks ago on an unexpected and unseen pothole. After that I heard a rubbing sound and found that the plastic shroud inside the driver front wheel well was knocked out of place. I banged it back into place with my hand and went on my way. I'm going to ask them to check that area when I take it in but they don't have an open slot until 4 days from now.
     
    #6 ca3799, Aug 21, 2020
    Last edited: Aug 21, 2020
  7. Grit

    Grit Senior Member

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    o_O
     
  8. ASRDogman

    ASRDogman Senior Member

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    I answered this in another section, but:
    You could have one of your ABS sensors going bad.

    I recently replaced my front wheel bearings. The next day cruise wouldn't work, brake light was on,
    skid control, and abs. You'll also lose charging when you let off the the throttle, and electric braking.

    But my right rear ABS sensor failed. I replaced the rear hubs 9000 miles ago.
    I had to reinstall my old one until I get the replacement.

    You'll need techstream or OB2 reader that will read ABS systems.
    Hopefully, it will be a front sensor. Easy to change.
     
  9. ca3799

    ca3799 Junior Member

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    Thank you for your reply.

    After the "reflashing", the same 3 error lights returned a few days later (Traction control, brake, and ABS). I can see that the car isn't charging properly.

    I took it back to the shop and mentioned that I had bottomed the car out on a pothole and that I had to push the dirt guard back into place to prevent it from rubbing the tire and that I may have damaged a sensor.

    This time they said it was the braking master cylinder and that it needed to be replaced for about $3,400.

    I'm going to get a second opinion after the hurricane(s) blow through.
     
  10. ChapmanF

    ChapmanF Senior Member

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    Has any shop you've been to so far given you a list of the trouble codes your car is reporting? Have you collected them yourself, either using an OBD reader or the light blinks?
     
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  11. ASRDogman

    ASRDogman Senior Member

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    Did you read post #8?
    What are the codes?
    My Right Rear was C0210. I think the left rear is C0209.


     
    #11 ASRDogman, Aug 26, 2020
    Last edited: Aug 26, 2020
  12. Grit

    Grit Senior Member

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    o_O
     
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  13. ASRDogman

    ASRDogman Senior Member

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    oooooppsssss.... :whistle::whistle::whistle::whistle::whistle:
     
  14. Grit

    Grit Senior Member

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    :ROFLMAO: (y)
     
  15. ca3799

    ca3799 Junior Member

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    Hurricane over and done- The second opinion on my 3 indicator lights reports the code is c1391. They reset the lights so the lights are off again now and said if the lights come on again they recommend to replace the actuator for about $1,300.
     
  16. bisco

    bisco cookie crumbler

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    that's a good price
     
  17. Tombukt2

    Tombukt2 Junior Member

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    This is how it was always done learn this method first learn more about the car at same time forcing you under hood vs a plug into dash
     
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