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ABS ESC lights on
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Thread: ABS ESC lights on

  1. #1
    Junior Member
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    May 2019
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    ABS ESC lights on

    2012 Fiat 500 sport 1.4 is has ABS and ESC light on, ABS shows code C0039-29. I replaced the right wheel speed sensor, crp unit shows all wheel speed sensors working but the code comes back after clearing. I had issues before with ESC light on and cruise control not working which resolved after fixing the trunk hatch wiring issue common with this car. Stators are clean and each wheel shows signal on a meter. I'm not that great of a mechanic but usually get things working over time but this has me totally stumped. Anyone have any suggestions or experience with this problem?

  2. #2
    Senior Member
    Join Date
    Feb 2016
    Northern Virginia
    Thanked 361 Times in 257 Posts
    This is a classic corroded electrical ground connection problem. Remove the battery, battery tray. Underneath the battery on the "frame" you will see three ground wires attached to welded studs. Remove all three ground cables and clean both sides with some Scotchbrite or a wire brush until shiny metal. Do not just loosen and re-tighten the connections, physically take them apart and clean them. After you replace and re-tighten the connections, coat them with some grease to protect them from more corrosion.

  3. The Following User Says Thank You to KellyfromVA For This Useful Post:

    Fiat500USA (08-26-2019)

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