Brake Switch Circuit ‘A’ / ‘B’ Correlation
Table of contents
P0504 MERCURY Possible Causes
- Faulty Brake Pedal Switch (BPS) (Stop Lamp Switch)
- Faulty Brake Pedal Position (BPP) Switch
- Brake Pedal Switch harness is open or shorted
- Brake Pedal Switch circuit poor electrical connection
How do I fix code P0504 MERCURY?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P0504 MERCURY code
The cost of diagnosing the P0504 MERCURY code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0504 MERCURY Description
The Brake Pedal Switch (BPS) is sometimes referred to as the stop lamp switch. The BPS provides a signal to the Powertrain Control Module (PCM) indicating the brakes are applied. The BPS is normally open and mounted on the brake pedal support. The Powertrain Control Module does a comparison test between the Brake Pedal Switch and the Brake Pedal Position (BPP) switch. The Diagnostic Trouble Code (DTC) will set when the BPS and BPP are no to factory specifications.