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C1464/C1465 ABS code, ABS, Brake lights on and no speed

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by irobbins26, Jul 23, 2020.

  1. irobbins26

    irobbins26 New Member

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    ABS light, emergency brake light and stability control light all came on and the speedometer is not working. I replaced the 12 volt battery and nothing changed. I read the ABS codes and it came up with both front speed sensor codes: C1464(left) and C1465(Right). I checked the brake fluid level and it was halfway between low and full. I have not inspected either sensor yet, but the chances of both sensors going bad at the same time is not likely. Any ideas?
     
    #1 irobbins26, Jul 23, 2020
  2. SB6

    SB6 Member

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    Have you checked the sensors yet now?
     
    #2 SB6, Jul 23, 2020
  3. irobbins26

    irobbins26 New Member

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    Update: Sensors look clean, no visible damage. Fuses all look good. I erased the codes and they instantly came back.
     
    #3 irobbins26, Jul 24, 2020
  4. Raytheeagle

    Raytheeagle Senior Member

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    What did you read the codes with?

    Do you hear the abs system running frequently?

    How do the brakes feel if compared to prior use?
     
    #4 Raytheeagle, Jul 24, 2020
  5. ChapmanF

    ChapmanF Senior Member

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    The brake computer is telling you of an issue with the speed sensors. It is also not delivering speed information to the speedometer (which is information it gets from the speed sensors).

    The brake computer is inside of a box. It is connected to the speed sensors by wires. When it doesn't get the signals, it can't climb out of its box and poke around and tell you why. It needs you to do that. There could be a variety of reasons besides whether the sensors themselves look clean or undamaged.

    There are troubleshooting procedures for those codes in the repair manual (more info). They'll help.
     
    #5 ChapmanF, Jul 24, 2020
  6. AzusaPrius

    AzusaPrius Senior Member

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    Pop both the front sensors off and wipe them clean with a rag.

    Would be good to air compress where it goes into but you can just wipe them and try again.
     
    #6 AzusaPrius, Jul 24, 2020
  7. irobbins26

    irobbins26 New Member

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    Thank you. This was immensely helpful. I am used to dealing with hard copy service manuals and probably wouldn't have found this for a while. Will report back with updates.
     
    #7 irobbins26, Jul 24, 2020
  8. irobbins26

    irobbins26 New Member

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    Feeling pretty stupid at this point. Took the car into the dealer, who replaced both speed sensors. I had rodent damage at the connector under the wheel well covers where the sensor plugs into the car/computer system. If I would have taken the time to trace the failure up one more level, I could have saved myself a ton of time and money. Thanks for everyone's help.
     
    #8 irobbins26, Aug 18, 2020
    SB6 likes this.
  9. Dadder

    Dadder New Member

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    I have a similar problem in my prius V. Both right sensors are reading 0 mph. Cleaned and inspected and they seem fine. Given what you know now, how would you go about tracing the lines to the engine? Can you get to the part that was damaged from the engine compartment, or do you need to go from under the car. I am having a hard time figuring out how to trace the lines.
     
    #9 Dadder, Mar 22, 2021
  10. corystal

    corystal Junior Member

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    Damn! I had this exact thing happen to me. Too bad you didnt come across my post about it Check PCS system warning | Page 2 | PriusChat
    Now I have the problem again... checked the wire again before I ran the codes, but wire is fine and I've got codes for both sensors (unlike last time when there was just the right) so I'm wondering how both are showing up now.
     
    #10 corystal, Feb 29, 2024
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