AutoCodes – Generic – C1554

C1554 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 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 7,800

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

What does this mean?

What are the Possible Causes of the DTC C1554?

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?

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 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 C1554 code?

Need more information on how to fix the C1554 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1554 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1554 Lexus — Power Source Relay Circuit Malfunction
C1554 Scion — Power Source Relay Circuit Malfunction
C1554 Toyota — Power Source Relay Circuit Malfunction

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 Code

1. What are the common symptoms of OBDII code C1554 (Power Source Relay Circuit Malfunction)?

- Common symptoms include difficulty starting the vehicle, intermittent or complete loss of power, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code C1554?

- The code C1554 can be triggered by a faulty power source relay, damaged wiring or connectors in the relay circuit, or a malfunctioning power control module.

3. How can I diagnose the cause of OBDII code C1554?

- Diagnosing the code typically involves inspecting the power source relay, checking for loose or damaged wiring, and using a multimeter to test the relay circuit for continuity and proper voltage.

4. Can I continue driving my vehicle with OBDII code C1554?

- It is not recommended to drive the vehicle with code C1554, as it can lead to potential safety hazards and further damage to the electrical system. It is advised to address the issue promptly.

5. How can I repair OBDII code C1554?

- Repairing the code C1554 may involve replacing the faulty power source relay, repairing or replacing damaged wiring or connectors, or recalibrating the power control module.

6. Are there any DIY tips for fixing OBDII code C1554?

- DIY tips for addressing code C1554 include ensuring all electrical connections are secure, inspecting for visible damage to wiring, and following the vehicle's service manual for specific repair procedures.

7. Is it necessary to reset the OBDII system after repairing code C1554?

- Yes, it is recommended to reset the OBDII system after repairing code C1554 to clear the error code and ensure proper functioning of the vehicle's onboard diagnostics.

8. Can extreme weather conditions cause OBDII code C1554 to trigger?

- Yes, extreme weather conditions such as extreme heat or cold can sometimes lead to electrical issues that trigger code C1554. Proper insulation and maintenance can help prevent such occurrences.

9. How can I prevent OBDII code C1554 from recurring in the future?

- To prevent code C1554 from recurring, regularly inspect and maintain the vehicle's electrical components, including the power source relay, wiring, and connectors, and address any issues promptly.

10. What should I do if OBDII code C1554 persists after attempted repairs?

- If code C1554 persists after attempted repairs, it is recommended to consult with a qualified mechanic or dealership for further diagnostics and assistance in resolving the issue.