AutoCodes – Cadillac – U3506 Cadillac

U3506 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 483

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC U3506 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

Need more information on how to fix the U3506 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3506 Cadillac 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 U3506 Cadillac Code

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

Symptoms may include illuminated Check Engine light, poor engine performance, and potential stalling.

2. What could cause the U3506 Cadillac code to trigger?

Possible causes include a faulty control module, damaged wiring or connectors, issues with the power supply, or a defective ground circuit.

3. How can I diagnose the U3506 code in a Cadillac?

Diagnosis typically involves using a diagnostic scanner to retrieve the code, inspecting the related circuits and components for damage, and performing voltage tests to pinpoint the issue.

4. Is it safe to drive with the U3506 code present in a Cadillac?

It is not recommended to drive with this code as it may lead to further damage or unsafe driving conditions. Immediate attention is advised.

5. Can I reset the U3506 code in a Cadillac and see if it comes back?

While you can clear the code using a diagnostic scanner, it is important to address the underlying issue causing the fault code to prevent it from reoccurring.

6. How do I repair the Control Module Supply Circuit 2 High Voltage issue in a Cadillac?

Repair may involve replacing the faulty control module, repairing damaged wiring or connectors, ensuring proper power supply, and addressing any ground circuit issues.

7. Can a DIY enthusiast fix the U3506 code in a Cadillac?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address this code. However, complex electrical issues may require professional assistance.

8. Are there any common mistakes to avoid when dealing with the U3506 code in a Cadillac?

Avoid overlooking simple things like loose connections, neglecting to check the power supply, or assuming the control module is the only culprit without thorough testing.

9. How long does it typically take to repair the U3506 code in a Cadillac?

The repair time can vary depending on the exact cause of the issue, the availability of parts, and the expertise of the person performing the repairs. It may range from a few hours to a day.

10. What is the approximate cost to fix the U3506 Cadillac code related to Control Module Supply Circuit 2 High Voltage?

The cost can vary widely based on the specific repairs needed, parts required, and labor rates. It is advisable to obtain quotes from different repair shops for an accurate estimate.