AutoCodes – Lincoln – P0504 Lincoln

P0504 Lincoln 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 Lincoln 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 3,233

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Basic DIY (1 / 3)

What is this?

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 Lincoln 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 Lincoln - Brake Switch Circuit 'A' / 'B' Correlation - AutoCodes.com — P0504 Lincoln Code - Brake Switch Circuit 'A' / 'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P0504 Lincoln?

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 Lincoln?

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 Lincoln 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 Lincoln Code

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

- Common symptoms include the brake lights staying on constantly, cruise control not working, and potential issues with shifting gears.

2. What are the typical causes of OBDII code P0504 appearing in a Lincoln?

- The most common causes are a faulty brake light switch, misaligned brake pedal position sensor, damaged wiring in the brake light circuit, or a malfunctioning PCM.

3. How can I diagnose the issue causing OBDII code P0504 in my Lincoln?

- Start by checking the brake light switch for proper operation, inspecting the brake pedal position sensor alignment, and testing the wiring and connections in the brake light circuit.

4. Is it safe to continue driving my Lincoln with OBDII code P0504 present?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to ensure proper brake light functionality and potentially avoid related safety concerns.

5. Can I repair OBDII code P0504 in my Lincoln myself, or should I seek professional help?

- Depending on your automotive repair skills, you may be able to address this code yourself by replacing the brake light switch or realigning the brake pedal position sensor. If unsure, seek professional help.

6. Will resetting the OBDII code P0504 in my Lincoln make the issue go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not resolved (e.g., faulty switch or sensor), the code is likely to reappear.

7. How much can I expect to pay for repairing OBDII code P0504 in a Lincoln at a repair shop?

- The cost of repair can vary depending on the specific cause, parts needed, and labor rates. It's advisable to obtain quotes from different repair shops to compare prices.

8. Are there any preventive maintenance tips to avoid OBDII code P0504 in the future?

- Regularly inspecting and maintaining the brake light switch, brake pedal position sensor, and related wiring can help prevent issues leading to OBDII code P0504 in the future.

9. Can a failing battery or alternator cause OBDII code P0504 to appear in a Lincoln?

- While a failing battery or alternator can potentially impact electrical systems, OBDII code P0504 is typically related to issues specific to the brake switch circuit and not directly caused by battery or alternator problems.

10. Will OBDII code P0504 affect the overall performance of my Lincoln, or is it primarily a safety concern?

- While the code itself may not affect the performance of the vehicle, it can lead to safety concerns such as malfunctioning brake lights and potential issues with systems like cruise control, making it important to address promptly.