AutoCodes – Toyota – P0504 2018 Toyota RAV4

P0504 2018 Toyota RAV4 Code - Brake Switch Circuit 'A' / 'B' Correlation

Quick Answer

The Stop Lamp Switch is a duplex system that transmits two signals: STP and ST1-. Common causes include Faulty Stop Lamp Switch (Brake Switch), Blown Stop Lamp Bulb, Stop Lamp 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 2018 Toyota RAV4 indicates Brake Switch Circuit 'A' / 'B' Correlation.
Common causes: Common causes include Faulty Stop Lamp Switch (Brake Switch), Blown Stop Lamp Bulb, Stop Lamp 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 574

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 Sep 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0504 2018 Toyota RAV4 Description

The Stop Lamp 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 2018 Toyota RAV4 - Brake Switch Circuit 'A' / 'B' Correlation - AutoCodes.com — P0504 2018 Toyota RAV4 Code - Brake Switch Circuit 'A' / 'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P0504 2018 Toyota RAV4?

Faulty Stop Lamp Switch (Brake Switch)
Blown Stop Lamp Bulb
Stop Lamp Switch harness open or shorted
Stop Lamp Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0504 2018 Toyota RAV4?

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 2018 Toyota RAV4 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 2018 Toyota RAV4 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 2018 Toyota RAV4 Code

1. What does OBDII code P0504 on a 2018 Toyota RAV4 mean?

Code P0504 indicates an issue with the Brake Switch Circuit 'A' / 'B' Correlation in the vehicle.

2. What are the common symptoms of OBDII code P0504 in a 2018 Toyota RAV4?

Common symptoms include the inability to shift out of park, cruise control not working, and possibly the brake lights staying on or not coming on at all.

3. What are the possible causes of OBDII code P0504 in a 2018 Toyota RAV4?

Potential causes include a faulty brake light switch, damaged wiring or connectors in the brake switch circuit, or a problem with the ECM (Engine Control Module).

4. How can I diagnose the issue causing OBDII code P0504 in my 2018 Toyota RAV4?

You can start by checking the brake light switch for proper operation, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to read the code and clear it for testing purposes.

5. Can I still drive my 2018 Toyota RAV4 with OBDII code P0504?

It is not recommended to drive the vehicle with this code active, as it can affect important functions like shifting and brake lights, compromising safety.

6. How do I repair OBDII code P0504 in my 2018 Toyota RAV4?

Repair options include replacing the brake light switch if faulty, repairing any damaged wiring or connectors, or seeking professional help to diagnose and fix the issue with the ECM if necessary.

7. Can I reset OBDII code P0504 in my 2018 Toyota RAV4 by disconnecting the battery?

Disconnecting the battery may clear the code temporarily, but it is important to diagnose and address the root cause to prevent the code from reappearing.

8. Will OBDII code P0504 cause my 2018 Toyota RAV4 to fail an emissions test?

Since this code is related to the brake switch circuit, it typically does not affect emissions directly. However, it should still be addressed to ensure proper vehicle operation.

9. How long does it take to repair OBDII code P0504 in a 2018 Toyota RAV4?

The repair time can vary depending on the exact cause of the issue. Simple fixes like replacing the brake light switch may take less time compared to diagnosing and repairing wiring or ECM problems.

10. Is OBDII code P0504 a common issue in the 2018 Toyota RAV4?

While not extremely common, issues related to the brake switch circuit can occur in various vehicles, including the 2018 Toyota RAV4. Proper maintenance and timely repairs can help prevent such issues.