AutoCodes – Toyota – P0504 2002 Toyota Highlander

P0504 2002 Toyota Highlander Code - Brake Switch Circuit 'A' / 'B' Correlation

Quick Answer

In addition to turning on the stop lamp, the stop lamp switch signals are used for a variety of engine, transmission, and suspension functions as well as being an input for diagnostic checks. 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 2002 Toyota Highlander 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 4,882

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0504 2002 Toyota Highlander Description

In addition to turning on the stop lamp, the stop lamp switch signals are used for a variety of engine, transmission, and suspension functions as well as being an input for diagnostic checks. It is important that the switch operates properly, therefore this switch is designed with two complementary signal outputs: STP and ST1.
The Engine Control Module (ECM) analyzes these signal outputs to detect malfunctions in the stop lamp switch.

OBDII Code P0504 2002 Toyota Highlander - Brake Switch Circuit 'A' / 'B' Correlation - AutoCodes.com — P0504 2002 Toyota Highlander Code - Brake Switch Circuit 'A' / 'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P0504 2002 Toyota Highlander?

Faulty stop lamp switch
Blown stop lamp bulb
Brake switch harness open or shorted
Brake switch circuit poor electrical connection
ECM

How to Fix the DTC P0504 2002 Toyota Highlander?

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 the bulb and fuse first, if they are good replace stop lamp switch.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0504 2002 Toyota Highlander 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 2002 Toyota Highlander code?

Need more information on how to fix the P0504 2002 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0504 2002 Toyota Highlander code diagnosed by a professional: Find a repair shop in your area

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 2002 Toyota Highlander Code

1. What does OBDII code P0504 mean for a 2002 Toyota Highlander?

The code P0504 on a 2002 Toyota Highlander indicates an issue with the Brake Switch Circuit 'A' / 'B' Correlation.

2. What are the common symptoms of OBDII code P0504 on a 2002 Toyota Highlander?

Common symptoms of code P0504 include the inability to shift out of park, cruise control not working, and the brake lights staying on all the time.

3. What are the possible causes of OBDII code P0504 on a 2002 Toyota Highlander?

Potential causes of code P0504 include a faulty brake light switch, wiring issues in the brake light circuit, or a problem with the brake switch circuit itself.

4. How do you diagnose OBDII code P0504 on a 2002 Toyota Highlander?

Diagnosing code P0504 involves checking the brake light switch for proper operation, inspecting the wiring for any damage or corrosion, and using a scan tool to monitor the switch's signals.

5. How can I repair OBDII code P0504 on a 2002 Toyota Highlander?

To repair code P0504, you may need to replace the brake light switch if it is faulty, repair any damaged wiring in the circuit, or reset the switch's position if necessary.

6. Can I drive my 2002 Toyota Highlander with OBDII code P0504?

It is not recommended to drive your Highlander with code P0504 as it can affect important safety functions like shifting out of park and brake light operation.

7. How much does it cost to fix OBDII code P0504 on a 2002 Toyota Highlander?

The cost to fix code P0504 can vary depending on the root cause of the issue, but it may involve a simple switch replacement or more extensive wiring repairs.

8. Will resetting the check engine light clear OBDII code P0504 on a 2002 Toyota Highlander?

Resetting the check engine light may temporarily clear the code, but if the underlying issue is not resolved, the code is likely to return after some time.

9. Can a DIY enthusiast fix OBDII code P0504 on a 2002 Toyota Highlander?

If you have experience with automotive repairs and access to the necessary tools, you may be able to diagnose and repair code P0504 yourself by following repair guides and manuals.

10. Is OBDII code P0504 a common issue in 2002 Toyota Highlanders?

Code P0504 related to the Brake Switch Circuit 'A' / 'B' Correlation can be a common issue in 2002 Toyota Highlanders, especially as the vehicle ages and components wear out.