AutoCodes – Toyota – P0504 2008 Toyota Camry

P0504 2008 Toyota Camry Code - Brake Switch Circuit 'A' / 'B' Correlation

Quick Answer

The stoplight switch is a duplex system that transmits two signals: STP and ST1-. Common causes include Faulty stop lamp switch, Blown stop lamp bulb, Brake switch harness 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 Toyota Camry indicates Brake Switch Circuit 'A' / 'B' Correlation.
Common causes: Common causes include Faulty stop lamp switch, Blown stop lamp bulb, Brake switch harness 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 5,225

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0504 2008 Toyota Camry Description

The stoplight switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the Engine Control Module (ECM) to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stoplight switch and sets the Diagnostic Trouble Code (DTC).

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

What does this mean?

What are the Possible Causes of the DTC P0504 2008 Toyota Camry?

Faulty stop lamp switch
Blown stop lamp bulb
Brake switch harness open or shorted
Brake switch circuit poor electrical connection
STOP fuse
IGN fuse

How to Fix the DTC P0504 2008 Toyota Camry?

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

Check to see if the bulbs are good if they are good check the STOP fuse and IGN fuse, if they are good most likely the STOP light switch (near the brake pedal) is bad if there is no wiring issues.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0504 2008 Toyota Camry 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 2008 Toyota Camry Code

1. What does the OBDII code P0504 mean on a 2008 Toyota Camry?

P0504 indicates a Brake Switch Circuit 'A' / 'B' Correlation issue, meaning the signals from the two brake switch circuits are inconsistent or out of sync.

2. What are the symptoms of the P0504 code in a 2008 Toyota Camry?

Common symptoms include the brake lights not functioning properly, the cruise control being disabled, and potential difficulty shifting out of park.

3. What causes the P0504 code to appear?

The most common causes are a faulty brake light switch, damaged or corroded wiring in the brake switch circuit, or a misaligned brake pedal switch.

4. Can I drive my 2008 Toyota Camry with a P0504 code?

While the car may still be drivable, safety features like brake lights and cruise control may be compromised, so itâ€™s best to address the issue promptly.

5. How do I diagnose the P0504 code on my 2008 Toyota Camry?

Start by inspecting the brake light switch and its wiring for damage or corrosion. Confirm the brake lights function properly and use a multimeter to test the switch circuits.

6. How do I fix the P0504 code on a 2008 Toyota Camry?

Common fixes include replacing the brake light switch, repairing damaged wiring, or ensuring the switch is correctly aligned with the brake pedal.

7. What tools are needed to repair a P0504 code?

Tools include a multimeter to test electrical continuity, basic hand tools for brake switch removal, and potentially an OBDII scanner to clear the code after repairs.

8. How much does it cost to fix a P0504 code on a 2008 Toyota Camry?

Replacing a brake light switch typically costs $50â€“$150 for parts and labor, depending on your location and the shop.

9. Can a blown fuse cause the P0504 code?

While it's uncommon, a blown fuse related to the brake light circuit could potentially trigger the code. Check all related fuses as part of the diagnosis.

10. Will replacing the brake light bulbs fix the P0504 code?

Replacing brake light bulbs alone is unlikely to fix the code unless thereâ€™s an electrical issue involving the circuit, but itâ€™s worth checking if the bulbs are functioning properly.