P0504 Code - Brake Switch Circuit 'A' / 'B' Correlation

What Does P0504 Mean?

If a failure occurs in the circuit for the brake light, a number of problems can occur. To keep you out of danger this code will be recorded, and the Check Engine Light will remain on until the cause of the problem is resolved and the code is cleared from the PCM.

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What are the common causes of P0504 ?

Some common causes of could P0504 could include the following-

• Defective brake light switch (By far the most common cause)
• Damaged, burnt, shorted, disconnected, or corroded wiring/connectors in any system that is associated with, or tied into the brake light circuit
• Blown fuses/fusible links
• Blown brake light bulbs
• Corroded brake light bulb holders
• Failed or failing PCM. Note that this is a rare event, and the fault must be sought elsewhere before any control module is replaced

How do you troubleshoot P0504 ?

Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

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