AutoCodes – GMC – U3505 GMC

U3505 GMC Code - Control Module Supply Circuit 2 Low 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: U3505 GMC indicates Control Module Supply Circuit 2 Low 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 1,024

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 U3505 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 U3505 GMC - Control Module Supply Circuit 2 Low Voltage - AutoCodes.com — U3505 GMC Code - Control Module Supply Circuit 2 Low Voltage

What does this mean?

What are the Possible Causes of the DTC U3505 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 U3505 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 U3505 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.

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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 U3505 GMC Code

1. What are common symptoms of OBDII code U3505 GMC (Control Module Supply Circuit 2 Low Voltage)?

The common symptoms of this code may include dimming or flickering dashboard lights, intermittent power steering assist, and difficulty starting the vehicle.

2. What are the potential causes of OBDII code U3505 GMC?

Possible causes of this code include a faulty control module, damaged wiring or connectors in the supply circuit, a weak battery, or a failing alternator.

3. How can I diagnose OBDII code U3505 GMC?

Diagnosing this code typically involves using a scan tool to read the code and check for any related codes. A thorough inspection of the control module, wiring, connectors, battery, and alternator is also recommended.

4. What are some repair tips for addressing OBDII code U3505 GMC?

Repair tips for this code may include checking and repairing any damaged wiring or connectors, testing and replacing the control module if necessary, ensuring the battery is in good condition, and checking the alternator output.

5. Can I drive my vehicle with OBDII code U3505 GMC?

It is not recommended to drive your vehicle with this code present, as it could lead to further electrical issues or potential stalling while driving. It is best to address the underlying problem as soon as possible.

6. How serious is OBDII code U3505 GMC?

While this code may not cause immediate drivability issues, it is still important to address it promptly to prevent potential electrical problems or failures in the future.

7. How much does it typically cost to repair OBDII code U3505 GMC?

The cost of repairing this code can vary depending on the underlying cause and the labor rates of the repair shop. It is advisable to get a diagnostic assessment to determine the exact cost.

8. Can a DIY enthusiast fix OBDII code U3505 GMC?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this code by checking and repairing wiring, connectors, or replacing the control module. However, complex electrical issues may require professional assistance.

9. Will resetting the OBDII code U3505 GMC make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

10. How can I prevent OBDII code U3505 GMC from occurring in the future?

To prevent this code from recurring, it is recommended to regularly inspect and maintain the vehicle's electrical system, including checking the battery, alternator, and wiring connections. Addressing any issues promptly can help prevent this code from appearing again.