Prius 2006 with ABS and (!) Sign (Turning off and on)

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Mansoor Ahmad, Mar 8, 2025 at 5:09 AM.

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  1. Mansoor Ahmad

    Mansoor Ahmad New Member

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    I just bought an old prius having 340K mileage.

    After driving it about 3 week, I am receiving ABS + (!) sign on my dashboard. Sometimes only (!) appear.
    Those signs disappear after few hours and comeback again. What could be the issue? ABS works when dashboard has no sign, it doesn't when sign lights are on

    - Should I change Wheel sensor?
    - Or actuator? (Scared about this one)....

    - What I noticed was, on bumps it usually turns on. or on turning wheel full left or right. (it's my assumption so far)
     
    #1 Mansoor Ahmad, Mar 8, 2025 at 5:09 AM
  2. ChapmanF

    ChapmanF Senior Member

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    #2 ChapmanF, Mar 8, 2025 at 10:33 AM
  3. Tombukt2

    Tombukt2 Senior Member

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    Get the codes with the blink business or use it decent scanner that has an ABS button most of them will read the Prius ABS codes I've noticed innova branded cheapo scanners will. But if you were in a hurry and didn't have all this access immediately just looking to see if your wheel sensors are in fact plugged in and the wire runs up where it's supposed to and plugs up and it's not frayed been slung out by a wheel or movement . And if all that checks out then you're back to getting the codes and doing whatever If you immediately see one of these wires snapped parade dangling well there you go usually with this model car and especially in the mileage range you were in this probably should have already happened but apparently not usually it's a one-time deal in this model the car is long gone if there's going to be a second time unless you're using used actuators of course
     
    #3 Tombukt2, Mar 8, 2025 at 12:27 PM
  4. Mansoor Ahmad

    Mansoor Ahmad New Member

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    I do have a scanner, but it isn't showing any code. I'll try visiting a mechanic if they can get a code out of their scanner.
     
    #4 Mansoor Ahmad, Mar 8, 2025 at 4:05 PM
  5. ChapmanF

    ChapmanF Senior Member

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    #5 ChapmanF, Mar 8, 2025 at 6:45 PM
  6. Brian1954

    Brian1954 Senior Member

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    If you are interested in buying a better scanner for your Prius, look at post #1 and then scroll down to post #37 in this thread, https://priuschat.com/index.php?posts/3246758
    The Autel AP200 is a very good choice.
     
    #6 Brian1954, Mar 8, 2025 at 7:02 PM
  7. Mansoor Ahmad

    Mansoor Ahmad New Member

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    I followed the suggested diagnostic approach.

    Hi

    ABS Error Code: 42
    (!) Error Code: 47


    Another observation that I just observed.
    those signs appear after 3-4 hours of driving. then they will disappear after 30-45 minutes.
     
    #7 Mansoor Ahmad, Mar 9, 2025 at 4:30 AM
  8. Mansoor Ahmad

    Mansoor Ahmad New Member

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    Understood. I'll take a look at it! Thanks!.. p.s I have shared error code (NON OBD2)
     
    #8 Mansoor Ahmad, Mar 9, 2025 at 4:31 AM
  9. Mansoor Ahmad

    Mansoor Ahmad New Member

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    Another thing,

    My brake pedal does give jerk / shuddering effect on low speed (0-10) since I bought
     
    #9 Mansoor Ahmad, Mar 9, 2025 at 4:35 AM
  10. ChapmanF

    ChapmanF Senior Member

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    As you already saw on our blink codes page, the 42 on the ABS light is just directing you to the ECB ((!)) light where the interesting code is.

    The C1247 (blink code 47) on the ECB light reports an issue with the brake pedal stroke sensor. There are several three-digit detail codes that you would be able to see on a suitable scan tool, and they could help pin the issue down more narrowly. You can see them in this repair-manual excerpt, which also has troubleshooting tips:

    https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/Repair%20Manual/04pruisr/05/21avn/cic12474.pdf
     
    #10 ChapmanF, Mar 9, 2025 at 9:18 PM
  11. Mansoor Ahmad

    Mansoor Ahmad New Member

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    Thank you for being so helpful!!!!

    I went to the mechanic today. He received C1247 code - Stroke Sensor.
    I read the document. What is hand held testor?
    I tried searching online for this part, couldn't find it
    Is the part number correct? 89510-47010.
     
    #11 Mansoor Ahmad, Mar 10, 2025 at 1:00 AM
  12. ChapmanF

    ChapmanF Senior Member

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    The "hand held tester" was the scan tool Toyota dealers used to use. These days they have a laptop running their "global techstream+" software. Just an OBD-II scan tool that can communicate with everything in the car.
     
    #12 ChapmanF, Mar 10, 2025 at 7:44 AM
  13. Brian1954

    Brian1954 Senior Member

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    This may be caused by a warped front rotor.
     
    #13 Brian1954, Mar 10, 2025 at 9:21 AM
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