What is the MG P0504 fault code?

1 Answers
SanGabriella
07/30/25 8:47am
MG fault code P0504 indicates Brake Switch A/B Correlation (Signal Implausible). Possible causes: If this fault code appears, it may indicate a malfunction in the brake switch or a circuit fault. Generally, such faults are caused by a damaged brake light switch or related circuit open/short circuit issues, primarily due to switch failure or poor contact in the wiring harness connectors. Solution: If this fault code appears, it is necessary to inspect the brake light switch assembly, wiring harness and connectors, and the brake light switch signal circuit. This fault requires a technician to use specialized tools for diagnosis. Once identified, contact a professional technician promptly to inspect and resolve the issue.
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