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P0504 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
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.
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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.