AutoCodes – Chevrolet – U3509 Chevrolet

U3509 Chevrolet Code - Control Module Supply Circuit 3 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: U3509 Chevrolet indicates Control Module Supply Circuit 3 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 843

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 U3509 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 U3509 Chevrolet - Control Module Supply Circuit 3 Low Voltage - AutoCodes.com — U3509 Chevrolet Code - Control Module Supply Circuit 3 Low Voltage

What does this mean?

What are the Possible Causes of the DTC U3509 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 U3509 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 U3509 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 U3509 Chevrolet code?

Need more information on how to fix the U3509 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3509 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 U3509 Chevrolet Code

1. What are the common symptoms of OBDII code U3509 on a Chevrolet vehicle?

The common symptoms of OBDII code U3509 (Control Module Supply Circuit 3 Low Voltage) on a Chevrolet vehicle may include stalling, rough idling, poor acceleration, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code U3509 to be triggered on a Chevrolet?

The OBDII code U3509 on a Chevrolet is typically triggered due to issues with the control module supply circuit, such as a faulty wiring harness, loose connections, or a failing control module.

3. How can I diagnose the OBDII code U3509 on my Chevrolet?

Diagnosing the OBDII code U3509 on a Chevrolet may require using a diagnostic scanner to read the trouble codes, inspecting the control module supply circuit for any visible damage, and performing voltage tests to identify the source of the low voltage issue.

4. Are there any safety precautions to consider when repairing OBDII code U3509 on a Chevrolet?

When repairing OBDII code U3509 on a Chevrolet, it is important to disconnect the battery to prevent electrical hazards, wear appropriate safety gear, and follow the manufacturer's guidelines for handling electrical components.

5. Can I drive my Chevrolet with the OBDII code U3509 present?

It is not recommended to drive your Chevrolet with the OBDII code U3509 present, as it can lead to potential performance issues and further damage to the vehicle's control module system.

6. How much does it typically cost to repair OBDII code U3509 on a Chevrolet?

The cost to repair OBDII code U3509 on a Chevrolet can vary depending on the underlying cause of the issue, but it may range from $100 to $500 for parts and labor.

7. Can I reset the OBDII code U3509 on my Chevrolet without fixing the underlying issue?

While you can clear the trouble code using a diagnostic scanner, it is not recommended to do so without addressing the root cause of the problem, as the issue may persist and potentially worsen over time.

8. Is OBDII code U3509 a common issue in Chevrolet vehicles?

OBDII code U3509 (Control Module Supply Circuit 3 Low Voltage) is not as common as some other codes, but it can still occur in Chevrolet vehicles, especially in older models or those with electrical system issues.

9. Can a DIY enthusiast repair OBDII code U3509 on a Chevrolet?

Repairing OBDII code U3509 on a Chevrolet may require advanced knowledge of automotive electrical systems, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

10. How long does it take to repair OBDII code U3509 on a Chevrolet?

The repair time for OBDII code U3509 on a Chevrolet can vary depending on the complexity of the issue and the availability of replacement parts, but it may take a few hours to a full day to complete the repair.