P0504 - Brake Switch Circuit 'A' / 'B' Correlation
Repair Importance Level:
Repair Difficulty Level:
- Faulty stop lamp switch
- Blown stop lamp bulb
- Brake switch harness open or shorted
- Brake switch circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
The Engine Control Module (ECM) has detected a fault in correlation between the two brake switch circuits
P0504 Information for specific makes
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