AutoCodes – Generic – U3504

U3504 Code - Control Module Input Power 'B' Circuit Range/Performance

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Faulty Control Module setting the code, Control Module harness is open or shorted, Control Module circuit poor electrical connection. 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: U3504 indicates Control Module Input Power 'B' Circuit Range/Performance.
Common causes: Common causes include Faulty Control Module setting the code, Control Module harness is open or shorted, Control Module circuit poor electrical connection.
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 1,599

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 Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U3504 Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. With the ignition is ON, the Diagnostic Trouble Code (DTC) will set when the control module or sensor detects a system voltage of less than approximately 9 V for approximately 5 s.

OBDII Code U3504 - Control Module Input Power 'B' Circuit Range/Performance - AutoCodes.com — U3504 Code - Control Module Input Power 'B' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC U3504?

Faulty Control Module setting the code
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U3504?

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 U3504 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 U3504 code?

Need more information on how to fix the U3504 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3504 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U3504 Buick — Control Module Input Power 'B' Circuit Range/Performance
U3504 Cadillac — Control Module Input Power 'B' Circuit Range/Performance
U3504 Chevrolet — Control Module Input Power 'B' Circuit Range/Performance
U3504 GMC — Control Module Input Power 'B' Circuit Range/Performance

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 U3504 Code

1. What are the common symptoms of OBDII code U3504?

- Common symptoms include engine misfire, rough idle, poor fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code U3504?

- Possible causes include a faulty control module, wiring issues in the input power circuit, a weak battery, or a malfunctioning power relay.

3. How do I diagnose OBDII code U3504?

- Diagnosis typically involves using a scan tool to read the code, checking the wiring and connections in the input power circuit, and testing the control module and associated components for proper functionality.

4. What repairs are commonly needed to fix OBDII code U3504?

- Repairs may involve repairing or replacing damaged wiring, repairing or replacing the control module, checking and replacing the power relay if necessary, and ensuring a stable power supply to the module.

5. Can I continue driving with OBDII code U3504?

- It is not recommended to continue driving with this code as it can lead to further damage to the vehicle and potential safety hazards. It is best to address the issue promptly.

6. How serious is OBDII code U3504?

- While the severity can vary depending on the underlying cause, this code should be addressed promptly to prevent potential issues with engine performance and vehicle operation.

7. Can a DIY enthusiast repair OBDII code U3504?

- Depending on the individual's level of automotive knowledge and experience, some DIY repairs like checking and repairing wiring connections may be possible. However, more complex repairs may require professional assistance.

8. How much does it typically cost to fix OBDII code U3504?

- The cost of fixing this code can vary widely depending on the specific cause of the issue, the extent of the damage, and whether professional labor is required. It is recommended to obtain quotes from automotive professionals.

9. Are there any preventive measures to avoid OBDII code U3504 in the future?

- Regular vehicle maintenance, including checking the battery health, inspecting wiring for damage, and addressing any electrical issues promptly, can help prevent OBDII code U3504 from occurring.

10. How long does it take to repair OBDII code U3504?

- The repair time can vary depending on the complexity of the issue, the availability of parts, and whether professional assistance is required. Simple fixes may take a few hours, while more involved repairs may take longer.