AutoCodes – Chevrolet – U3505 Chevrolet

U3505 Chevrolet Code - Control Module Supply Circuit 2 Low Voltage

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: U3505 Chevrolet indicates Control Module Supply Circuit 2 Low Voltage.
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 2,819

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 U3505 Chevrolet 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 U3505 Chevrolet - Control Module Supply Circuit 2 Low Voltage - AutoCodes.com — U3505 Chevrolet Code - Control Module Supply Circuit 2 Low Voltage

What does this mean?

What are the Possible Causes of the DTC U3505 Chevrolet?

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

How to Fix the DTC U3505 Chevrolet?

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 U3505 Chevrolet 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 U3505 Chevrolet code?

Need more information on how to fix the U3505 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3505 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 U3505 Chevrolet Code

1. What does the OBDII code U3505 mean on a Chevrolet?

The U3505 code indicates "Control Module Supply Circuit 2 Low Voltage," meaning a control module is detecting insufficient voltage in a specific power supply circuit.

2. What are the common symptoms of the U3505 code in a Chevrolet?

Symptoms may include the check engine light turning on, intermittent electrical issues, unresponsive controls, or failure of certain vehicle functions like lighting or accessories.

3. What causes the U3505 code to appear in a Chevrolet?

Common causes include a weak battery, damaged wiring, corroded connectors, blown fuses, or a faulty control module.

4. Can a failing alternator cause the U3505 code?

Yes, a failing alternator can lead to insufficient voltage, which may trigger the U3505 code.

5. How do I diagnose the U3505 code in my Chevrolet?

Start by checking the battery voltage, inspecting wiring and connectors for damage or corrosion, and testing the alternator and related fuses.

6. Can I drive my Chevrolet with the U3505 code?

Itâ€™s not recommended, as low voltage in the control module circuit could lead to further electrical issues or impair vehicle performance.

7. How do I fix the U3505 code in a Chevrolet?

Repairs may include replacing a weak battery, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing a faulty control module.

8. Does the U3505 code require professional repair?

While basic checks like inspecting the battery and connectors can be done at home, more advanced diagnostics may require professional tools and expertise.

9. Can a software issue cause the U3505 code in a Chevrolet?

Yes, in rare cases, a software glitch or outdated control module firmware could contribute to this code.

10. How can I prevent the U3505 code from occurring in the future?

Regular maintenance like checking battery health, inspecting wiring, and ensuring all electrical connections are clean and secure can help prevent this issue.