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  1. #1
    Join Date
    Feb 2017
    Posts
    111

    Default ABS light is on, code is ABS circuit A, replaced pedal position sensor, still on

    The title sorta sums this one up. I have the 'pull over safely urgent' issue message, ABS lights on. Code is 'brake circuit A' and sometimes 'brake circuit A and B'. Googling suggested the brake position sensor which I replaced today. I cleared the codes, but it came back up.

    This issue is intermittent, pretty much 50/50 and once you start the car if it's off it stays off and vice-versa. I have a Volvo specific code reader and I cleared the codes with that, still came back. I had also replaced both front ABS wheel speed sensors out of an abundance of caution.

    Also replaced the brake light switch sorta by accident.

    What else could it be?

    This is my 2002 V70 XC turbo inline 5.

    drGian
    current lineup: 2001 Volvo v70 2.4 Turbo, 2014 Ford Flex AWD, 3.5 V6 Turbo, 2017 F-150 3.5 V6 Turbo

  2. #2
    Join Date
    Feb 2013
    Location
    Boston, MA
    Posts
    1,159

    Default

    What codes did you have? Read by DiCE/VIDA if possible.
    2002 V70 (sold)
    2005 XC70 (Telos Road took it. Did a chassis swap)
    2016 XC60

  3. #3
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,876

    Default

    Googling suggested that I have terminal cancer.

    But a couple of Tums cured my symptoms, so...

    Look, you really need to do some more troubleshooting, which must include testing, on this. A code doesn’t mean that a particular component has failed, only that the car has registered a fault. Another component may be causing this problem.

    In your case, the ABS module is a weak spot, so are the reluctor rings themselves. A bad reluctor ring will show up as a wheel sensor fault since the wheel sensor isn’t reading speed properly.

    So, cheapest thing to do is examine each ring closely, clean them up and look for cracks. Go from there.

    A Volvo-specific code reader is nice, but only gets you about 10% of the way through the troubleshooting process. The additional steps in VIDA will walk you through the rest.

    But examine the rings first. Maybe you’ll get lucky. Throwing parts at it is going to get expensive.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  4. #4
    Join Date
    Feb 2017
    Posts
    111

    Default

    are the reluctor rings the gear looking like rings that the wheel speed sensors are pointed at? I assume I can get at them just by pulling the wheels off. I will do that and look for cracks and let you know what I find after they are cleaned up.

    I have a bootlegged copy of Vida but it has expired, I think there is a really easy way around that I have research what it is, but first I'm just going to try setting the date back a few years to when it last worked.

    Thanks, I'll keep you posted.

    drGian
    current lineup: 2001 Volvo v70 2.4 Turbo, 2014 Ford Flex AWD, 3.5 V6 Turbo, 2017 F-150 3.5 V6 Turbo

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