1. #1

    Error Code U102B

    I am having a trouble with my rear wheel speed sensor. Iíve had my EBS, Traction Control, and ESP BAS lights on for awhile so I replaced my sensor and cleared my computer but still am getting the lights with the U102B code still coming up. The sensor fixed 3 other codes but wonít get rid of this one does anyone know a fix or possible cause?


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  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
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    Re: Error Code U102B

    What year, make, model???
    Otherwise you het generic answers that may be wrong.



    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: Error Code U102B

    Itís a 2010 Jeep Wrangler Jk


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  4. Re: Error Code U102B

    Are you SURE that is a U code ?
    Speed sensors are 'C' series codes. AND C102B is Right Rear Wheel Speed Sensor Circuit.

    TIP - If I am correct about # note key word is CIRCUIT. expensive lesson.

  5. #5

    Re: Error Code U102B

    Yeah I had 2 C codes before and fixed it with the sensor and now I have the U code remaining. Do you know the fixes for a U code?


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  6. #6

    Re: Error Code U102B

    Actually my bad it is a C code! I wrote it wrong. I have the code C102B


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  7. Re: Error Code U102B

    OK that code C102B makes sense...

    Give me some time - access to info is S L O W at night...

  8. Re: Error Code U102B

    2010 Jeep Wrangler Jk

    using a test light or a DVOM -

    Is there @10V terminal 1 ? should be @ battery voltage
    Is terminall 2 grounded ? you could probe terminal1 to terminal2

    these are mst likely I expect no V at #1 - let me know as we go to next wiring ck.
    Attached Images Attached Images Error Code U102B-terminal-1.jpg Error Code U102B-terminal-2.jpg 

  9. #9

    Re: Error Code U102B

    I am going to do the test but honestly never had to use my multimeter for stuff like this before. What settings do I set it to to test the voltage? I have a analog meterError Code U102B-image1596311464.458870.jpg


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  10. #10

    Re: Error Code U102B

    I figured out how to test it with my multimeter and it is reading same voltage as my battery. But as far as terminal 2 being grounded I didnít know what you meant by that. I put + in terminal 1 and - in terminal 2 and got the same reading as my battery


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  11. #11
    Join Date
    Feb 2009
    Location
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    Error Code U102B

    Touch the black lead to the frame or a bare metal area. Then touch the red to the terminal you are testing. 0 zero volts is ground.


    Regards,
    JPNinPA

    Never look down on anybody unless you're helping them up. -Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  12. #12

    Re: Error Code U102B

    Yeah its grounded. Wires seem good and reading good Volts what else could it be? Could the sensor I purchased be faulty?


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  13. #13
    Join Date
    Feb 2009
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    Re: Error Code U102B

    Change the DMM to read K ohms. Touch one lead to each prong of the ABS sensor. Should be 2-5K ohms.


    Regards,
    JPNinPA

    Never look down on anybody unless you're helping them up. -Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  14. #14

    Re: Error Code U102B

    So check the actual sensor not the wire with ohms?


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  15. #15

    Re: Error Code U102B

    So I checked the ohms but not sure if I did it right.(Iím not good with electrical at all). I set it to 10 ohms max on my multimeter and connected each probe to each pin sticking out of the actual sensor and read 0 ohms just want to make sure before I call quadratec and ask for a replacement


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  16. #16
    Join Date
    Feb 2009
    Location
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    Re: Error Code U102B

    So it turns out I was wrong about jk speed sensor resistance. It will read zero volts. It will vary the current between 7 and 14 MA as the wheel turns and the sensor has 12v across it.

    A ODBII scanner can display the currents.

    Have you reset the codes via a ODBII code reader? My Honda had issues with speed sensors and each time I changed it I drove over to OReilly's and used their reader to reset the codes.


    Regards,
    JPNinPA

    Never look down on anybody unless you're helping them up. -Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  17. #17

    Re: Error Code U102B

    Yeah I have a Flashpack Superchip reader and cleared all my DTCs and itís the only code still popping up


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  18. #18
    Join Date
    Feb 2009
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    Error Code U102B

    Have you cleaned or inspected the tone ring?
    Error Code U102B-img_3165.jpg

    Debris or a crack in this will cause issues. Also be sure the sensor is fully inserted with the correct gap .


    Regards,
    JPNinPA

    Never look down on anybody unless you're helping them up. -Jesse Jackson
    Last edited by JPNinPA; 08-07-2020 at 10:45 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  19. #19

    Re: Error Code U102B

    I replaced the new sensor. The one I purchased was faulty and now my issue is finally resolved!


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