P0504

Brake Light Switch Signal Correlation

Severity: Medium Brake System Toyota Specific Est. Repair: $40 - $120

Schedule diagnosis soon. Continued driving may worsen the issue.

What Does P0504 Mean?

Toyota-specific brake switch correlation fault. Common when switch is out of adjustment.

Common Symptoms

CEL
Cruise may not work

Possible Causes

Misadjusted brake light switch
Failed switch
Connector
Burned bulbs

How to Fix P0504 – Repair Guide

Adjust or replace switch
Verify brake lights work
Clear and retest
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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.