AutoCodes – GMC – U3506 GMC

U3506 GMC Code - Control Module Supply Circuit 2 High 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: U3506 GMC indicates Control Module Supply Circuit 2 High 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 572

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 U3506 GMC 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 U3506 GMC - Control Module Supply Circuit 2 High Voltage - AutoCodes.com — U3506 GMC Code - Control Module Supply Circuit 2 High Voltage

What does this mean?

What are the Possible Causes of the DTC U3506 GMC?

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

How to Fix the DTC U3506 GMC?

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 U3506 GMC 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 U3506 GMC code?

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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.