AutoCodes – Mazda – P0504 Mazda

P0504 Mazda 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 Mazda 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 9,935

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
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0504 Mazda 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 Mazda - Brake Switch Circuit 'A' / 'B' Correlation - AutoCodes.com — P0504 Mazda Code - Brake Switch Circuit 'A' / 'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P0504 Mazda?

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 Mazda?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0504 Mazda 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.

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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 Mazda Code

1. What are the common symptoms of OBDII code P0504 in a Mazda related to the Brake Switch Circuit 'A'/'B' Correlation?

- Common symptoms include the inability to shift out of Park, cruise control not working, and the brake lights staying on or not functioning.

2. What are the possible causes of OBDII code P0504 in a Mazda?

- The code P0504 in a Mazda can be triggered by issues such as a faulty brake light switch, damaged wiring in the brake light circuit, or a misaligned brake pedal position sensor.

3. How can I diagnose the OBDII code P0504 in a Mazda related to the Brake Switch Circuit 'A'/'B' Correlation?

- To diagnose P0504, you can start by checking the brake lights to see if they are working properly. Then, inspect the brake light switch and its wiring for any visible damage or loose connections.

4. Can I still drive my Mazda with OBDII code P0504 present?

- It is not recommended to drive your Mazda with code P0504 present, as it can affect crucial safety features like the ability to shift gears and proper brake light operation.

5. How can I repair OBDII code P0504 in my Mazda?

- Repairing OBDII code P0504 may involve replacing the faulty brake light switch, repairing damaged wiring, or recalibrating the brake pedal position sensor to ensure proper correlation.

6. Is it possible to reset OBDII code P0504 in a Mazda without fixing the underlying issue?

- While you can clear the code temporarily, it is crucial to address the root cause of P0504 to prevent safety hazards and ensure the proper functioning of your Mazda's brake system.

7. Can a DIY enthusiast fix OBDII code P0504 in a Mazda?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to replace a faulty brake light switch or repair damaged wiring associated with code P0504 in a Mazda.

8. Will OBDII code P0504 cause my Mazda's check engine light to illuminate?

- Yes, OBDII code P0504 related to the Brake Switch Circuit 'A'/'B' Correlation can trigger the check engine light in your Mazda, indicating a problem that needs attention.

9. Are there any safety risks associated with ignoring OBDII code P0504 in a Mazda?

- Ignoring code P0504 in a Mazda can pose safety risks such as the brake lights not functioning properly, leading to potential rear-end collisions or difficulties in shifting gears.

10. How long does it typically take to repair OBDII code P0504 in a Mazda?

- The repair time for OBDII code P0504 can vary based on the specific cause of the issue, but it generally takes a few hours to diagnose, fix, and test the Brake Switch Circuit 'A'/'B' Correlation problem in a Mazda.