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C1555 Toyota Code - Power Steering Motor Relay Welding Failure

Quick Answer

The C1555 diagnostic trouble code (DTC) for Toyota vehicles specifically refers to a Power Steering Motor Relay Welding Failure. Common causes include Faulty power steering motor relay: The most common cause of this code is a malfunctioning power steering motor relay, Electrical issues: Wiring harness problems, loose connections, or a faulty power steering control module can also trigger this code, Power steering motor failure: A failing power steering motor can lead to issues with the power steering system. 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
C1555 Toyota indicates Power Steering Motor Relay Welding Failure.
Common causes
Common causes include Faulty power steering motor relay: The most common cause of this code is a malfunctioning power steering motor relay, Electrical issues: Wiring harness problems, loose connections, or a faulty power steering control module can also trigger this code, Power steering motor failure: A failing power steering motor can lead to issues with the power steering system.
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 06, 2024
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Code C1555 Toyota Description

The C1555 diagnostic trouble code (DTC) for Toyota vehicles specifically refers to a Power Steering Motor Relay Welding Failure. This code indicates that there is an issue with the power steering system's motor relay, which is responsible for controlling the power steering motor. The power steering motor is crucial for providing the necessary assistance to the driver when turning the steering wheel, making it easier to maneuver the vehicle, especially at lower speeds or while parking.

OBDII Code C1555 Toyota - Power Steering Motor Relay Welding Failure
C1555 Toyota Code - Power Steering Motor Relay Welding Failure

Common Causes of C1555 Toyota

  1. Faulty power steering motor relay: The most common cause of this code is a malfunctioning power steering motor relay.
  2. Electrical issues: Wiring harness problems, loose connections, or a faulty power steering control module can also trigger this code.
  3. Power steering motor failure: A failing power steering motor can lead to issues with the power steering system.
  4. Overheating: Excessive heat can cause the power steering motor relay to weld together, resulting in a failure.

Symptoms of C1555 Toyota

  1. Increased steering effort: The driver may notice that it requires more effort to turn the steering wheel, especially at lower speeds.
  2. Unresponsive steering: The power steering system may become unresponsive, making it challenging to steer the vehicle.
  3. Power steering assist failure: The power steering assist may fail completely, causing a significant increase in steering effort.
  4. Warning light: The power steering warning light on the dashboard may illuminate, indicating a problem with the power steering system.

How to Fix C1555 Toyota

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the power steering system to identify the root cause of the problem.
  2. Replace the power steering motor relay: If the relay is found to be faulty, replace it with a new one to restore proper functionality to the power steering system.
  3. Check wiring and connections: Inspect the wiring harness and connections for any signs of damage, corrosion, or looseness. Repair or replace any damaged components as needed.
  4. Test the power steering system: After completing the repair, test the power steering system to ensure that it is functioning correctly and that the power steering assist is working as expected.
  5. Clear the trouble codes: Use a diagnostic scanner to clear the stored trouble codes from the vehicle's computer to reset the system and turn off the warning light on the dashboard.

Cost to Fix C1555 Toyota

The typical repair costs for a Power Steering Motor Relay Welding Failure can vary depending on the extent of the damage, the cost of parts, and the labor rates at the auto repair shop. In general, replacing a power steering motor relay can cost anywhere from $150 to $300, including parts and labor. However, prices may fluctuate based on the specific make and model of the vehicle, the location of the repair shop, and other factors.

What does this mean?

Tech Notes for C1555 Toyota

In some vehicles, it is necessary to replace the Power Steering ECU when there is a problem in the power relay because each relay is built into the Power Steering ECU.

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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 C1555 Toyota Code

1. What are common symptoms of OBDII code C1555 in a Toyota related to Power Steering Motor Relay Welding Failure?

The common symptoms include malfunctioning power steering system, difficulty steering, and illuminated warning lights on the dashboard.

2. What causes the Power Steering Motor Relay Welding Failure leading to OBDII code C1555 in a Toyota?

The main cause is a welding failure in the power steering motor relay, which can be triggered by electrical issues or component wear over time.

3. How can I diagnose OBDII code C1555 related to Power Steering Motor Relay Welding Failure in my Toyota?

Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the power steering system for visible damage, and testing the relay for proper functioning.

4. Can I continue driving my Toyota with OBDII code C1555 indicating Power Steering Motor Relay Welding Failure?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the power steering system and compromise driving safety.

5. What repairs are needed to fix OBDII code C1555 related to Power Steering Motor Relay Welding Failure in a Toyota?

Repair typically involves replacing the faulty power steering motor relay and addressing any underlying electrical issues contributing to the welding failure.

6. Is it possible to reset OBDII code C1555 after repairing Power Steering Motor Relay Welding Failure in a Toyota?

After the necessary repairs are made, the code can be cleared using an OBDII scanner to reset the system and ensure the issue has been resolved.

7. Are there any preventive measures to avoid encountering OBDII code C1555 due to Power Steering Motor Relay Welding Failure in a Toyota?

Regular maintenance checks, including inspecting the power steering system components and addressing any electrical issues promptly, can help prevent this code from occurring.

8. Can a DIY enthusiast fix OBDII code C1555 related to Power Steering Motor Relay Welding Failure in a Toyota?

While some experienced DIYers may be able to replace the power steering motor relay, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure safety and accuracy.

9. How much does it typically cost to repair OBDII code C1555 associated with Power Steering Motor Relay Welding Failure in a Toyota?

The cost of repairs can vary depending on the extent of the damage, parts needed, and labor rates, but it is advisable to budget for potentially significant expenses to address this issue effectively.

10. Will fixing OBDII code C1555 related to Power Steering Motor Relay Welding Failure improve the overall performance of my Toyota's power steering system?

Yes, addressing this code promptly and accurately can help restore the proper functioning of the power steering system, ensuring smooth steering operation and driving experience.

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