AutoCodes – Ford – P0504 2008 Ford Fusion

P0504 2008 Ford Fusion Code - Brake Switch Circuit 'A' / 'B' Correlation

Quick Answer

The Brake Pedal Switch (BPS) is sometimes referred to as the stop lamp switch. Common causes include Faulty Brake Pedal Switch (BPS) (Stop Lamp Switch), Faulty Brake Pedal Position (BPP) Switch, Brake Pedal Switch harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0504 2008 Ford Fusion indicates Brake Switch Circuit 'A' / 'B' Correlation.
Common causes: Common causes include Faulty Brake Pedal Switch (BPS) (Stop Lamp Switch), Faulty Brake Pedal Position (BPP) Switch, Brake Pedal Switch harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 2,953

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Basic DIY (1 / 3)

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Table of contents Created and updated by William Orellana on Jul 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0504 2008 Ford Fusion 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.

OBDII Code P0504 2008 Ford Fusion - Brake Switch Circuit 'A' / 'B' Correlation - AutoCodes.com — P0504 2008 Ford Fusion Code - Brake Switch Circuit 'A' / 'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P0504 2008 Ford Fusion?

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 to Fix the DTC P0504 2008 Ford Fusion?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0504 2008 Ford Fusion code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0504 2008 Ford Fusion code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0504 2008 Ford Fusion Code

1. What is OBDII code P0504 for a 2008 Ford Fusion?

The OBDII code P0504 for a 2008 Ford Fusion refers to the Brake Switch Circuit 'A' / 'B' Correlation.

2. What are the common symptoms of OBDII code P0504 on a 2008 Ford Fusion?

Common symptoms of OBDII code P0504 on a 2008 Ford Fusion include issues with the brake lights, cruise control malfunction, and potential problems with the vehicle's transmission shifting.

3. What are the possible causes of OBDII code P0504 on a 2008 Ford Fusion?

Possible causes of OBDII code P0504 on a 2008 Ford Fusion include a faulty brake light switch, damaged wiring or connectors in the brake light circuit, or a malfunctioning vehicle speed sensor.

4. How can I diagnose OBDII code P0504 on my 2008 Ford Fusion?

To diagnose OBDII code P0504 on a 2008 Ford Fusion, you can start by checking the brake light switch for proper operation, inspecting the wiring and connectors for any damage, and testing the vehicle speed sensor.

5. How can I repair OBDII code P0504 on my 2008 Ford Fusion?

To repair OBDII code P0504 on a 2008 Ford Fusion, you may need to replace the brake light switch if it is faulty, repair any damaged wiring or connectors in the brake light circuit, or replace a malfunctioning vehicle speed sensor.

6. Can I continue driving my 2008 Ford Fusion with OBDII code P0504?

It is not recommended to continue driving your 2008 Ford Fusion with OBDII code P0504, as it can lead to safety issues such as malfunctioning brake lights or problems with the vehicle's transmission.

7. Will OBDII code P0504 on a 2008 Ford Fusion cause the check engine light to illuminate?

Yes, OBDII code P0504 on a 2008 Ford Fusion can cause the check engine light to illuminate, signaling an issue with the Brake Switch Circuit 'A' / 'B' Correlation.

8. How long does it typically take to repair OBDII code P0504 on a 2008 Ford Fusion?

The time it takes to repair OBDII code P0504 on a 2008 Ford Fusion can vary depending on the specific cause of the issue and the extent of the repairs needed. It can range from a quick fix to a more involved repair process.

9. Can OBDII code P0504 on a 2008 Ford Fusion be a recurring problem?

If the underlying cause of OBDII code P0504 on a 2008 Ford Fusion is not properly addressed during the initial repair, it can potentially become a recurring problem. Regular maintenance and thorough diagnostics can help prevent this issue from happening again.

10. Is it necessary to reset the OBDII code P0504 on a 2008 Ford Fusion after the repair?

After repairing OBDII code P0504 on a 2008 Ford Fusion, it is recommended to reset the code using an OBDII scanner to clear the error code and ensure that the issue has been successfully resolved.