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What Does P0504 Code Mean?

    OBD-II Code P0504 is defined as a Brake Switch "A"/"B" Correlation

    The Brake Switch tells the engine control module (PCM) that the brake pedal is depressed. This switch also controls the brake lights. If the PCM detects an incorrect signal from the Brake Switch, the PCM will set code P0504.

    P0504 Symptoms

    • Brake lights may not illuminate
    • Cruise control will not operate

    Common Problems That Trigger the P0504 Code

    • Brake switch failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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