AutoCodes – Buick – U3506 Buick

U3506 Buick 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 Buick 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 547

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

What does this mean?

What are the Possible Causes of the DTC U3506 Buick?

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 Buick?

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 Buick 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.

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Need Help with the 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 Buick Code

1. What are common symptoms of OBDII code U3506 in a Buick related to Control Module Supply Circuit 2 High Voltage?

The common symptoms include illuminated Check Engine Light, poor engine performance, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code U3506 indicating Control Module Supply Circuit 2 High Voltage in a Buick?

Possible causes include a faulty control module, damaged wiring or connectors, a short circuit, or a problem with the power supply.

3. How can I diagnose the OBDII code U3506 in my Buick?

Diagnosing the code involves using an OBDII scanner to retrieve the specific code, inspecting the control module and associated wiring for damage, and testing the power supply to the module.

4. Can I still drive my Buick with OBDII code U3506 present?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety issues. It is best to address the issue promptly.

5. How do I repair OBDII code U3506 in my Buick?

Repairing the code may involve replacing the faulty control module, repairing damaged wiring or connectors, fixing any short circuits, or addressing power supply issues. It is advisable to consult a professional mechanic for proper diagnosis and repair.

6. Are there any DIY tips for fixing OBDII code U3506 in a Buick?

While some basic inspections like checking for loose connections or damaged wires can be done DIY, it is recommended to seek professional help for accurate diagnosis and repair to ensure the issue is properly resolved.

7. Can a weak car battery cause OBDII code U3506 in a Buick?

Yes, a weak car battery can potentially cause voltage irregularities that trigger this code. Ensure your car's battery is in good condition and properly connected.

8. Is resetting the fault code enough to fix OBDII code U3506 in a Buick?

Simply resetting the fault code is not a permanent solution. The underlying issue causing the code needs to be diagnosed and repaired to prevent it from reoccurring.

9. How long does it typically take to repair OBDII code U3506 in a Buick?

The repair time can vary depending on the exact cause of the issue. Simple fixes like reconnecting a loose wire may take less time, while replacing a control module or addressing complex wiring problems could take longer.

10. Can OBDII code U3506 in a Buick cause damage to other vehicle components if left unattended?

Yes, if left unresolved, this code can lead to further damage to the control module, wiring system, or even other vehicle components. It's important to address the issue promptly to prevent potential costly repairs in the future.