DTCs for simultaneous, solid ABS, BRAKE, and Slip Indicator dash lights

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by kehyler, Jan 11, 2025 at 9:32 AM.

  1. kehyler

    kehyler Member

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    Hi Guys,

    On a morning commute I got a solid ABS, BRAKE, and Slip Indicator dash lights for about half the commute. Evening commute back home had no lights on. No firm observable on the brake system so far, all appears normal.

    Here are the DTCs as read out by the jumper wire method:
    • Slip Indicator Light -> 43
    • ABS warning Light-> 33 & 38
    • Brake system warning light -> 36
    Just last week, I did swap in snow tires & rims for the first time. Lights appeared about 1 week later.

    Could someone point me to where in the repair manual the real DTCs are stored? Other ideas as too root cause?

    Thanks,

    -kehyler
     
    #1 kehyler, Jan 11, 2025 at 9:32 AM
  2. rjparker

    rjparker Tu Humilde Sirviente

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    I normally recommend 94 year olds from blah seek qualified help or maybe stop driving. Can't contribute to possible injuries caused by diy in a critical system.

    I would get a capable scanner (usually Techstream) that read the actual dtcs and info codes.

    Several at once usually means one is causing the others

    "When 2 or more DTCs are detected, perform circuit inspections one by one until the problem is identified."

    In most cases on gen3s, the brake booster fails.
     
    #2 rjparker, Jan 11, 2025 at 10:07 AM
  3. kehyler

    kehyler Member

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    ^I thought the flashing lights indicated specific DTCs? I just don't know where in the repair manual that lookup table is.
     
    #3 kehyler, Jan 11, 2025 at 10:40 AM
  4. ChapmanF

    ChapmanF Senior Member

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    You thought right. Our page about the blink codes already tells you about the VSC 43 and ECB 36 blinks, which both just mean "hey, there are real codes on the ABS light, go look at those."

    Blink (a/k/a Flash) Codes – How to. | PriusChat

    As for the 33 and 38 on the ABS, you're also right that you'll find the corresponding DTCs in the repair manual. The blink code page linked above shows you how.
     
    #4 ChapmanF, Jan 11, 2025 at 11:36 AM
  5. kehyler

    kehyler Member

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    Okay, so I guess the DTC codes are C0210 and C1238.

    C0210, "Rear Speed Sensor RH Circuit"
    While driving at 10 km/h (6 mph) or more, speed sensor output from one or two wheels is lower than that from other wheels for 15 seconds or more.

    C1238, "Foreign Object is Attached on Tip of Front Speed Sensor RH"
    Either of the following is detected:
    1. When driving at 20 km/h (12 mph) or more, noise occurs on the speed sensor or signal waveform for 5 seconds or more.
    2. When driving at 10 km/h (6 mph) or more, noise occurs once per wheel revolution for 15 seconds or more.

    Maybe this line of attack, working from easy to hard.
    1. Clear codes & demonstrate repeatability of problem.
    2. Swap non-studded tires back on for a week or two, comment about noise made me think this could be worth a try.
    3. Unplug replug wiring harness @ both ends.
    4. Replace right rear wheel bearing to get new sensor
    5. Replace wiring harness.
    6. Cry & bring it to someone with more intelligence than me.
     
    #5 kehyler, Jan 11, 2025 at 2:45 PM
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