Question about Hyundai Sonata

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07 sonata. I have a code p0504. what do i need to be looking for what needs to b replaced?

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  • calvin meadow Aug 23, 2010


  • mirlush
    mirlush Jan 23, 2012

    I've just finish resolving the same issue. It turns out that the dealership installed the wrong type of tail bulb. Same size and fit, but the wrong number. It resulted in the two connectors in the bulb fusing together and computer pointed out, in P0504, that one of the lights was saying that the break is on. Also, due to the same reason, the remote started failed to work. It would start and then shut itself off.
    Anyway, thank god a five dollar bulb solved the problem. So go to local store, find out which bulb you are supposed to have and check it against which one you actually have.



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Hi! If the PCM (powertrain control module) registers a code p0504 it's definitely a brake switch failure. You will need to have it replaced to get rid of the code. Hope this helps and thank you for using FixYa!

Posted on Aug 23, 2010


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