AutoCodes – Scion – C1554 Scion

C1554 Scion Code - Power Source Relay Circuit Malfunction

Quick Answer

The Diagnostic Trouble Code (DTC) will be set when the Power source relay circuit malfunctions. 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: C1554 Scion indicates Power Source Relay Circuit 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 3,818

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1554 Scion Description

The Diagnostic Trouble Code (DTC) will be set when the Power source relay circuit malfunctions. If the Power Steering ECU detects this Diagnostic Trouble Code (DTC), it shuts off the motor relay circuit (built into the Power Steering ECU) and stops power assist.

OBDII Code C1554 Scion - Power Source Relay Circuit Malfunction - AutoCodes.com — C1554 Scion Code - Power Source Relay Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC C1554 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 C1554 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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1554 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 C1554 Scion Code

1. What are the common symptoms of OBDII code C1554 in a Scion related to Power Source Relay Circuit Malfunction?

- Common symptoms include difficulty starting the vehicle, intermittent power loss, and the illumination of the check engine light.

2. What are the possible causes of OBDII code C1554 in a Scion indicating a Power Source Relay Circuit Malfunction?

- The code can be triggered by a faulty power source relay, damaged wiring or connectors, a blown fuse, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose OBDII code C1554 in my Scion for a Power Source Relay Circuit Malfunction?

- You can diagnose the issue by checking the power source relay, inspecting the wiring and connectors for damage, testing the fuses, and scanning the PCM for any related error codes.

4. Can I still drive my Scion with OBDII code C1554 indicating a Power Source Relay Circuit Malfunction?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential power loss or other issues while on the road.

5. What are some repair tips for fixing OBDII code C1554 in a Scion due to a Power Source Relay Circuit Malfunction?

- Repair tips include replacing the faulty power source relay, repairing any damaged wiring or connectors, ensuring the fuses are in good condition, and resetting the PCM after the repairs.

6. How much does it typically cost to repair OBDII code C1554 in a Scion caused by a Power Source Relay Circuit Malfunction?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 including parts and labor.

7. Can a DIY enthusiast fix OBDII code C1554 related to Power Source Relay Circuit Malfunction in a Scion?

- While some simple fixes like checking fuses or connectors can be done by DIY enthusiasts, diagnosing and repairing more complex issues may require professional help.

8. How urgent is it to address OBDII code C1554 in a Scion indicating a Power Source Relay Circuit Malfunction?

- It is advisable to address the issue promptly to avoid potential safety hazards, further damage to the vehicle, and to ensure optimal performance and reliability.

9. Will resetting the OBDII system clear OBDII code C1554 in a Scion caused by a Power Source Relay Circuit Malfunction?

- Resetting the system may temporarily clear the code, but if the underlying issue is not repaired, the code is likely to reappear after driving the vehicle.

10. Is OBDII code C1554 in a Scion related to a Power Source Relay Circuit Malfunction a common issue?

- While it is not as common as some other OBDII codes, issues with power source relay circuits can occur in Scion vehicles, especially in older models or those with high mileage.