P0504 FORD – Brake Switch Circuit ‘A’ / ‘B’ Correlation

P0504 FORD Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0504 FORD Possible Causes

Faulty Brake Lamp Switch,Blown Brake Lamp Bulb,Blown Brake Lamp Fuse,Brake Lamp Switch harness open or shorted,Brake Lamp Switch circuit poor electrical connection

P0504 FORD Description

The Powertrain Control Module (PCM) does a comparison test between the Brake Pedal Switch (BPS) and the Brake Pedal Position (BPP) switch.