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Engine-Codes – GMC – U3506 GMC

U3506 GMC Code - Control Module Supply Circuit 2 High Voltage

Quick Answer

The U3506 GMC diagnostic trouble code (DTC) indicates that there is a high voltage condition detected in Control Module Supply Circuit 2. Common causes include Faulty Control Module: A malfunctioning control module could be causing the high voltage condition in Control Module Supply Circuit 2, Wiring or Connector Damage: Damage to the wiring or connectors in the supply circuit can lead to a high voltage condition, Voltage Regulator Malfunction: A faulty voltage regulator may be supplying too much voltage to the control module, triggering the U3506 DTC. 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 GMC indicates Control Module Supply Circuit 2 High Voltage.
Common causes
Common causes include Faulty Control Module: A malfunctioning control module could be causing the high voltage condition in Control Module Supply Circuit 2, Wiring or Connector Damage: Damage to the wiring or connectors in the supply circuit can lead to a high voltage condition, Voltage Regulator Malfunction: A faulty voltage regulator may be supplying too much voltage to the control module, triggering the U3506 DTC.
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 16, 2024
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Code U3506 GMC Description

The U3506 GMC diagnostic trouble code (DTC) indicates that there is a high voltage condition detected in Control Module Supply Circuit 2. This code typically points to an issue with the power supply circuit for a specific control module in the vehicle. The control module in question may vary depending on the specific make and model of the vehicle.

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

Common Causes of U3506 GMC

  1. Faulty Control Module: A malfunctioning control module could be causing the high voltage condition in Control Module Supply Circuit 2.
  2. Wiring or Connector Damage: Damage to the wiring or connectors in the supply circuit can lead to a high voltage condition.
  3. Voltage Regulator Malfunction: A faulty voltage regulator may be supplying too much voltage to the control module, triggering the U3506 DTC.
  4. Battery or Charging System Problems: Issues with the vehicle's battery or charging system, such as a failing alternator, can result in a high voltage condition in the control module supply circuit.

Symptoms of U3506 GMC

  1. Check Engine Light: The most common symptom associated with the U3506 DTC is the illumination of the check engine light on the vehicle's dashboard.
  2. Erratic Behavior: The vehicle may exhibit erratic behavior, such as rough idling, stalling, or hesitation during acceleration.
  3. Electrical Issues: There may be electrical problems, such as flickering lights, malfunctioning gauges, or issues with power windows or door locks.
  4. Reduced Performance: The vehicle may experience a decrease in performance, including decreased power output or poor fuel efficiency.
  5. Transmission Issues: The transmission may shift erratically or exhibit harsh shifting patterns due to the high voltage condition affecting the control module.

How to Fix U3506 GMC

  1. Diagnostic Scan: Begin by using a diagnostic scan tool to retrieve the specific DTCs stored in the vehicle's computer, including the U3506 code.
  2. Inspect Wiring and Connectors: Thoroughly inspect the wiring and connectors in Control Module Supply Circuit 2 for any signs of damage or corrosion.
  3. Test Voltage Regulator: Test the vehicle's voltage regulator to ensure that it is functioning correctly and supplying the appropriate voltage to the control module.
  4. Check Control Module: Verify the operation of the control module associated with the high voltage condition and replace it if necessary.
  5. Clear Codes and Test Drive: After completing the repairs, clear the DTCs from the vehicle's computer and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix U3506 GMC

The typical repair costs for addressing the U3506 GMC DTC can vary depending on the specific cause of the high voltage condition and the extent of the repairs needed. In general, the cost of parts for this repair could range from $100 to $500, while labor costs may range from $150 to $300. Overall, the total repair cost for resolving the U3506 DTC could fall between $250 and $800, including parts and labor.

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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 GMC Code

1. What are the common symptoms of OBDII code U3506 GMC?

- Common symptoms include illuminated Check Engine light, poor vehicle performance, and possible stalling or rough idling.

2. What does the OBDII code U3506 GMC indicate?

- U3506 indicates that the Control Module Supply Circuit 2 is experiencing high voltage, potentially causing issues with the vehicle's control module.

3. What are the possible causes of OBDII code U3506 GMC?

- Possible causes include a faulty control module, wiring issues, a defective power supply, or a problem with the control module relay.

4. How can I diagnose OBDII code U3506 GMC?

- Diagnosis typically involves using a scan tool to read the code, checking the wiring and connections related to Control Module Supply Circuit 2, and testing the control module and power supply components.

5. What are the repair options for OBDII code U3506 GMC?

- Repairs may involve replacing the control module, repairing damaged wiring, replacing the power supply components, or addressing any issues with the control module relay.

6. Can I drive my vehicle with OBDII code U3506 GMC?

- It is not recommended to drive the vehicle with this code active, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

7. How do I reset the OBDII code U3506 GMC after repairs?

- After completing the necessary repairs, you can reset the code using a scan tool or by disconnecting the vehicle's battery for a few minutes to clear the code.

8. Will OBDII code U3506 GMC cause my vehicle to fail an emissions test?

- Yes, this code can cause your vehicle to fail an emissions test, as it signifies a problem with the control module supply circuit that can impact emissions control systems.

9. Are there any preventive measures to avoid OBDII code U3506 GMC?

- Regular vehicle maintenance, including checking the control module and wiring, can help prevent issues that may lead to this code. Addressing any electrical issues promptly can also help avoid this problem.

10. How much does it typically cost to repair OBDII code U3506 GMC?

- Repair costs can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

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