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P1520 Lexus Code - Stop Lamp Switch Malfunction

Quick Answer

The P1520 diagnostic trouble code (DTC) for Lexus vehicles indicates a malfunction in the stop lamp switch. Common causes include Worn out or faulty stop lamp switch, Electrical issues such as a blown fuse or wiring problems, Faulty brake pedal position sensor. 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
P1520 Lexus indicates Stop Lamp Switch Malfunction.
Common causes
Common causes include Worn out or faulty stop lamp switch, Electrical issues such as a blown fuse or wiring problems, Faulty brake pedal position sensor.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1520 Lexus Description

The P1520 diagnostic trouble code (DTC) for Lexus vehicles indicates a malfunction in the stop lamp switch. This switch is a critical component of the vehicle's brake system, as it is responsible for activating the brake lights when the brake pedal is pressed. When the stop lamp switch malfunctions, it can lead to a variety of issues that can affect the vehicle's performance and safety.

OBDII Code P1520 Lexus - Stop Lamp Switch Malfunction
P1520 Lexus Code - Stop Lamp Switch Malfunction

Common Causes of P1520 Lexus

  1. Worn out or faulty stop lamp switch.
  2. Electrical issues such as a blown fuse or wiring problems.
  3. Faulty brake pedal position sensor.
  4. Corrosion or dirt buildup affecting switch operation.

Symptoms of P1520 Lexus

  1. Brake lights not illuminating when the brake pedal is pressed.
  2. Inability to shift out of park.
  3. Warning lights on the dashboard related to the brake system.
  4. Vehicle failing state inspections due to brake light issues.

How to Fix P1520 Lexus

  1. Locate the stop lamp switch near the brake pedal assembly.
  2. Disconnect the electrical connector attached to the switch.
  3. Remove the switch from its mounting bracket.
  4. Install the new stop lamp switch and secure it in place.
  5. Reconnect the electrical connector and test the brake lights to ensure proper operation.

Cost to Fix P1520 Lexus

The cost of repairing a stop lamp switch malfunction can vary depending on the make and model of the vehicle, as well as the labor rates in your area. On average, the parts for a stop lamp switch replacement can range from $20 to $50, while the labor costs can range from $80 to $150 per hour. Overall, the total repair cost can range from $100 to $300, including parts and labor. It is recommended to get a few quotes from local auto repair shops to get a more accurate estimate for your specific vehicle.

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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 P1520 Lexus Code

1. What does the OBDII code P1520 mean on a Lexus?

P1520 indicates a Stop Lamp Switch Malfunction, meaning the vehicle's ECM has detected an issue with the brake light switch or its circuit.

2. What are the common symptoms of the P1520 code in a Lexus?

Symptoms may include the brake lights not working, the vehicle being stuck in park, the check engine light turning on, or issues with cruise control functionality.

3. What causes the P1520 code to appear on a Lexus?

It is usually caused by a faulty stop lamp switch, damaged wiring or connectors, a blown fuse, or improper adjustment of the brake light switch.

4. Can I drive my Lexus with a P1520 code?

Driving with a P1520 code can be unsafe if the brake lights are not functioning properly, as this can make it harder for other drivers to see when you're braking.

5. How can I diagnose the P1520 code on my Lexus?

Start by checking the brake lights for proper operation, inspecting the stop lamp switch and its wiring for damage or disconnection, and testing the switch with a multimeter.

6. How do I fix the P1520 code on a Lexus?

Repair or replace the stop lamp switch if faulty, fix any damaged wiring or connectors, and ensure the switch is properly adjusted to the brake pedal.

7. How much does it cost to repair a P1520 code on a Lexus?

Repair costs can vary, but replacing a stop lamp switch typically costs $50–$150 for parts and labor, depending on the vehicle model and labor rates.

8. Can a faulty stop lamp switch affect other systems in my Lexus?

Yes, a faulty stop lamp switch can impact systems like cruise control, traction control, and the shift interlock mechanism, preventing the vehicle from shifting out of park.

9. How do I reset the P1520 code after repairs?

After repairs, the code can be cleared using an OBDII scanner. If the issue is resolved, the code should not return.

10. What tools do I need to fix a P1520 code on my Lexus?

You may need an OBDII scanner, a multimeter, basic hand tools, and possibly a service manual for your specific Lexus model to diagnose and fix the issue.

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