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U3506 Chevrolet Code - Control Module Supply Circuit 2 High Voltage

Quick Answer

The U3506 Chevrolet code indicates a problem with the Control Module Supply Circuit 2, specifically that the voltage is too high. Common causes include Faulty control module, Wiring issues, such as a short or open circuit, Bad connection or poor ground. 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
U3506 Chevrolet indicates Control Module Supply Circuit 2 High Voltage.
Common causes
Common causes include Faulty control module, Wiring issues, such as a short or open circuit, Bad connection or poor ground.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code U3506 Chevrolet Description

The U3506 Chevrolet code indicates a problem with the Control Module Supply Circuit 2, specifically that the voltage is too high. The Control Module Supply Circuit 2 is responsible for providing power to various control modules in the vehicle, allowing them to function properly. When the voltage in this circuit is too high, it can lead to issues with the operation of these modules, potentially causing malfunctions in various systems of the vehicle.

OBDII Code U3506 Chevrolet - Control Module Supply Circuit 2 High Voltage
U3506 Chevrolet Code - Control Module Supply Circuit 2 High Voltage

Common Causes of U3506 Chevrolet

  1. Faulty control module
  2. Wiring issues, such as a short or open circuit
  3. Bad connection or poor ground
  4. Battery or charging system problems
  5. Electrical system overload

Symptoms of U3506 Chevrolet

  1. Check engine light illuminated on the dashboard
  2. Loss of power or performance issues
  3. Electrical malfunctions, such as erratic behavior of lights or accessories
  4. Difficulty starting the vehicle
  5. Poor fuel efficiency

How to Fix U3506 Chevrolet

  1. Begin by conducting a thorough inspection of the Control Module Supply Circuit 2 to identify the source of the high voltage issue.
  2. Check the control modules connected to the circuit for any signs of damage or malfunction.
  3. Inspect the wiring and connections in the circuit for any visible damage, corrosion, or loose connections.
  4. Test the vehicle's battery and charging system to ensure they are functioning properly and not contributing to the high voltage condition.
  5. Replace any faulty control modules, repair damaged wiring or connections, and address any issues with the battery or charging system as needed.

Cost to Fix U3506 Chevrolet

The cost of repairing a Control Module Supply Circuit 2 High Voltage issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the cost of parts for this repair can range from $100 to $500, while labor costs can range from $150 to $300. Overall, the total repair cost for this issue typically falls in the range of $250 to $800. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the specific diagnosis and repair process required. It's recommended to consult with a qualified mechanic or auto repair shop for a more accurate cost estimate based on your individual circumstances.

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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 U3506 Chevrolet Code

1. What are the common symptoms of OBDII code U3506 in a Chevrolet, indicating an issue with Control Module Supply Circuit 2 High Voltage?

The common symptoms include the Check Engine light illuminating on the dashboard, decreased fuel efficiency, and potential drivability issues like rough idling or hesitation during acceleration.

2. What could cause the OBDII code U3506 to be triggered in a Chevrolet, related to Control Module Supply Circuit 2 High Voltage?

Possible causes include a faulty control module, damaged wiring or connectors in the circuit, an issue with the power supply, or a problem with the ground connection.

3. How can I diagnose the OBDII code U3506 in my Chevrolet to pinpoint the exact issue with Control Module Supply Circuit 2 High Voltage?

You can use a diagnostic scanner to read the trouble codes and perform a thorough inspection of the control module, wiring, connectors, and power supply components to identify any visible damage or issues.

4. What are some repair tips for resolving OBDII code U3506 in a Chevrolet related to Control Module Supply Circuit 2 High Voltage?

Repair tips may include checking and repairing any damaged wiring or connectors, ensuring a secure connection to the control module, verifying proper power supply, and potentially replacing the control module if it is found to be faulty.

5. Can I continue driving my Chevrolet with the OBDII code U3506 present, indicating an issue with Control Module Supply Circuit 2 High Voltage?

It is generally not recommended to continue driving with this code present, as it can lead to further damage to the vehicle and potentially affect its performance. It is best to address the issue promptly.

6. How serious is the OBDII code U3506 in a Chevrolet related to Control Module Supply Circuit 2 High Voltage?

While the severity can vary depending on the root cause, it is important to address this code promptly to prevent potential damage to other components and ensure the vehicle operates correctly.

7. Is it possible to reset the OBDII code U3506 in a Chevrolet without addressing the underlying issue with Control Module Supply Circuit 2 High Voltage?

Resetting the code without fixing the root cause will only temporarily clear the Check Engine light. The code is likely to reappear if the underlying issue is not resolved.

8. Can a DIY enthusiast with basic automotive knowledge repair the OBDII code U3506 in a Chevrolet related to Control Module Supply Circuit 2 High Voltage?

Depending on the specific cause, some DIY repairs may be possible, such as checking and repairing wiring or connectors. However, more complex issues may require professional assistance.

9. How much can I expect to pay for repairing the OBDII code U3506 in a Chevrolet related to Control Module Supply Circuit 2 High Voltage?

The cost of repair can vary widely depending on the root cause, the extent of the damage, and whether professional labor is required. It is advisable to obtain quotes from reputable mechanics.

10. Are there any preventive measures I can take to avoid encountering the OBDII code U3506 in a Chevrolet related to Control Module Supply Circuit 2 High Voltage in the future?

Regular vehicle maintenance, including inspecting wiring and connectors, ensuring proper power supply connections, and promptly addressing any related issues, can help prevent this code from appearing.

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