AutoCodesToyota – P1520 Toyota

P1520 Toyota Code - Stop Light Switch Signal Malfunction

Quick Answer

This signal is used to detect when the brakes have been applied. Common causes include Faulty Stop Light Switch, Stop Light Switch harness is open or shorted, Stop Light Switch circuit poor electrical connection. 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 Toyota indicates Stop Light Switch Signal Malfunction.
Common causes
Common causes include Faulty Stop Light Switch, Stop Light Switch harness is open or shorted, Stop Light Switch circuit poor electrical connection.
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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 43,014
How popular is this code, among other codes? Medium
Table of contents Created and updated by William Orellana on Aug 27, 2019
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1520 Toyota Description

This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as the voltage supplied to the stop lights. The STP signal is used mainly to control the fuel cut–off engine speed (The fuel cut–off engine speed is reduced slightly when the vehicle is braking).
OBDII Code P1520 Toyota - Stop Light Switch Signal Malfunction - AutoCodes.com
P1520 Toyota Code - Stop Light Switch Signal Malfunction

What are the Possible Causes of the DTC P1520 Toyota?

  • Faulty Stop Light Switch
  • Stop Light Switch harness is open or shorted
  • Stop Light Switch circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P1520 Toyota?

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 P1520 Toyota 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 P1520 Toyota code?

Need more information on how to fix the P1520 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1520 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 Toyota Code

1. What are the common symptoms of OBDII code P1520 Toyota (Stop Light Switch Signal Malfunction)?

- Common symptoms include the brake lights staying on or not functioning properly, the vehicle not shifting out of park, and the inability to engage cruise control.

2. What are the possible causes of OBDII code P1520 Toyota?

- The code may be triggered by a faulty stop light switch, damaged wiring or connectors in the brake light circuit, or issues with the brake pedal position sensor.

3. How can I diagnose the cause of OBDII code P1520 Toyota?

- You can start by checking the operation of the brake lights, testing the stop light switch, inspecting the wiring and connectors, and scanning the vehicle for any related trouble codes.

4. Can I still drive my car with OBDII code P1520 Toyota?

- It is not recommended to drive your vehicle with this code as it can affect the proper functioning of important safety features like the brake lights and shift interlock system.

5. How can I repair OBDII code P1520 Toyota?

- Repair options may include replacing the stop light switch, repairing damaged wiring or connectors, resetting the fault codes, and ensuring proper adjustment of the brake pedal position sensor.

6. Will OBDII code P1520 Toyota cause any long-term damage to my vehicle?

- While the code itself may not cause immediate damage, it is important to address the underlying issue promptly to prevent potential safety hazards and further complications.

7. Can a DIY enthusiast fix OBDII code P1520 Toyota?

- Depending on your experience and tools, some DIY enthusiasts may be able to diagnose and repair this code by following a step-by-step guide or consulting a repair manual.

8. How much does it typically cost to fix OBDII code P1520 Toyota at a repair shop?

- The cost of repair can vary depending on the cause of the issue, labor rates in your area, and whether any parts need to be replaced. It is advisable to get a few quotes from different mechanics.

9. Is it possible for OBDII code P1520 Toyota to come back after being cleared?

- If the underlying issue causing the code is not properly addressed, there is a possibility for the code to return even after being cleared. It is important to ensure a thorough repair.

10. Can OBDII code P1520 Toyota be related to other codes or issues in the vehicle?

- Yes, this code can sometimes be related to other codes such as P0705 (Transmission Range Sensor Circuit Malfunction) or issues with the vehicle's brake system. It is important to conduct a comprehensive diagnosis.

Discuss the causes and fixes for P1520 Toyota OBDII Code

Code P1520 Toyota comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play