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Engine-Codes – Scion – C1555 Scion

C1555 Scion Code - Power Steering Motor Relay Welding Failure

Quick Answer

The C1555 code for Scion vehicles indicates a power steering motor relay welding failure. Common causes include Faulty power steering motor relay: The relay itself may be defective, leading to welding failure, Electrical issues: Problems with the wiring or connections related to the power steering system, Overheating: High temperatures can cause the relay to malfunction. 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 Scion indicates Power Steering Motor Relay Welding Failure.
Common causes
Common causes include Faulty power steering motor relay: The relay itself may be defective, leading to welding failure, Electrical issues: Problems with the wiring or connections related to the power steering system, Overheating: High temperatures can cause the relay to malfunction.
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 10, 2024
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Code C1555 Scion Description

The C1555 code for Scion vehicles indicates a power steering motor relay welding failure. This means that there is an issue with the relay that controls the power steering motor, which can significantly impact the vehicle's performance and safety. The power steering system helps the driver steer the vehicle with ease by using hydraulic or electric assistance. When the power steering motor relay fails, it can lead to stiff or jerky steering, making it difficult to control the vehicle, especially at low speeds or when parking.

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

Common Causes of C1555 Scion

  1. Faulty power steering motor relay: The relay itself may be defective, leading to welding failure.
  2. Electrical issues: Problems with the wiring or connections related to the power steering system.
  3. Overheating: High temperatures can cause the relay to malfunction.
  4. Wear and tear: Normal wear and tear over time can lead to relay failure.
  5. Moisture or corrosion: Water or corrosion can damage the relay and cause welding failure.

Symptoms of C1555 Scion

  1. Stiff or jerky steering: Difficulty in turning the steering wheel smoothly, especially at low speeds.
  2. Check engine light: The code triggers the check engine light on the dashboard.
  3. Steering wheel vibration: Vibrations felt in the steering wheel while driving.
  4. Strange noises: Unusual sounds coming from the power steering system, such as whining or groaning.

How to Fix C1555 Scion

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and pinpoint the specific problem with the power steering system.
  2. Replace the power steering motor relay: Install a new relay to ensure proper functioning of the power steering system.
  3. Check wiring and connections: Inspect the wiring and connections related to the power steering system to ensure they are in good condition.
  4. Clear the trouble codes: After completing the repair, clear the trouble codes stored in the vehicle's computer to reset the check engine light.
  5. Test drive: Take the vehicle for a test drive to ensure that the power steering system is functioning correctly and that the symptoms associated with the code have been resolved.

Cost to Fix C1555 Scion

The typical repair costs for a power steering motor relay welding failure can range from $200 to $500, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for repairs.

What does this mean?

Tech Notes for C1555 Scion

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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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 Scion Code

1. What does the OBDII code C1555 mean on a Scion?

C1555 indicates a Power Steering Motor Relay Welding Failure, meaning the relay controlling the power steering motor is stuck in the "on" position.

2. What are the symptoms of code C1555 in a Scion?

Symptoms may include heavy or stiff steering, the power steering warning light being illuminated, or intermittent power steering operation.

3. What causes the C1555 code in Scion vehicles?

Common causes include a faulty power steering motor relay, damaged wiring or connectors in the power steering system, or an internal issue within the power steering control module.

4. Can I drive my Scion with the C1555 code?

Driving with this code is possible but not recommended, as the loss of power steering assistance can make steering difficult and unsafe, especially at low speeds.

5. How do I diagnose the C1555 code on a Scion?

Start by inspecting the power steering motor relay, wiring, and connectors for damage or corrosion. Use a scan tool to check for related codes and monitor the power steering system's operation.

6. How do I fix the C1555 code in a Scion?

Repairs may include replacing the power steering motor relay, repairing damaged wiring, or reprogramming or replacing the power steering control module if necessary.

7. How much does it cost to fix the C1555 code in a Scion?

Repair costs can vary but typically range from $100 to $300 for parts and labor, depending on whether the relay or other components need replacement.

8. Can a weak battery cause the C1555 code?

While unlikely, a weak or failing battery can sometimes cause electrical issues, so it’s a good idea to check the battery's health to rule it out.

9. Is C1555 specific to Scion vehicles?

No, C1555 can appear in other Toyota family vehicles with similar electronic power steering systems, as they share similar components and designs.

10. Do I need to reset the power steering system after fixing C1555?

Yes, after repairs, clearing the code with an OBDII scan tool and testing the system is necessary to ensure the issue is resolved.

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