AutoCodes – Scion – C1551 Scion

C1551 Scion Code - Power Supply Voltage Malfunction

Quick Answer

The Power Steering ECU monitors itself for proper operation. Common causes include Power Steering ECU Fuse, Faulty Power Steering ECU, Power Steering ECU harness is 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: C1551 Scion indicates Power Supply Voltage Malfunction.
Common causes: Common causes include Power Steering ECU Fuse, Faulty Power Steering ECU, Power Steering ECU harness is 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.

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Code Popularity 798

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 22, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1551 Scion Description

The Power Steering ECU monitors itself for proper operation. The Power Steering ECU sets the OBDII code when it detects an internal malfunction. The Power Steering ECU distinguishes the ignition switch status as ON or OFF through the IG power source circuit. The Diagnostic Trouble Code (DTC) will be set when an IG power source circuit malfunctions inside ECU.

OBDII Code C1551 Scion - Power Supply Voltage Malfunction - AutoCodes.com — C1551 Scion Code - Power Supply Voltage Malfunction

What does this mean?

What are the Possible Causes of the DTC C1551 Scion?

Power Steering ECU Fuse
Faulty Power Steering ECU
Power Steering ECU harness is open or shorted
Power Steering ECU circuit poor electrical connection

How to Fix the DTC C1551 Scion?

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 C1551 Scion 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.

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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 C1551 Scion Code

1. What does the OBDII code C1551 mean on a Scion?

C1551 indicates a Power Supply Voltage Malfunction in the power steering control system, typically related to low or unstable voltage to the power steering ECU.

2. What are the common symptoms of code C1551 in a Scion?

Common symptoms include a loss of power steering assist, heavy steering effort, a power steering warning light on the dashboard, or intermittent steering issues.

3. What causes code C1551 to appear in a Scion?

Possible causes include a weak or failing car battery, damaged or corroded electrical connections, a faulty power steering ECU, or issues with the alternator.

4. How do I diagnose the C1551 code on a Scion?

Start by checking the battery voltage, inspecting the power steering systemâ€™s wiring and connections for damage or corrosion, and testing the alternator to ensure itâ€™s charging properly.

5. Can a low battery trigger the C1551 code in my Scion?

Yes, a low or failing battery can cause this code by not supplying sufficient voltage to the power steering ECU.

6. Is it safe to drive with code C1551 active on a Scion?

Driving may be unsafe as the loss of power steering assist could make steering difficult, especially at low speeds. Itâ€™s recommended to address the issue promptly.

7. How do I fix the C1551 code on a Scion?

Repairs may involve charging or replacing the battery, cleaning or repairing corroded connections, ensuring proper alternator function, or replacing the power steering ECU if necessary.

8. Can a faulty alternator cause the C1551 code in a Scion?

Yes, a faulty alternator that fails to maintain proper voltage levels can trigger this code.

9. How much does it cost to fix code C1551 on a Scion?

Costs vary depending on the root cause. Battery replacement is relatively inexpensive, while ECU replacement or alternator repairs may be more costly.

10. Can clearing the C1551 code solve the problem?

Clearing the code without fixing the underlying issue will only result in the code returning. Proper diagnosis and repair are necessary to resolve it.