AutoCodes – Generic – U3505

U3505 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 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 2,388

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

What does this mean?

What are the Possible Causes of the DTC U3505?

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?

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 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 U3505 code?

Need more information on how to fix the U3505 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3505 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U3505 Buick — Control Module Supply Circuit 2 Low Voltage
U3505 Cadillac — Control Module Supply Circuit 2 Low Voltage
U3505 Chevrolet — Control Module Supply Circuit 2 Low Voltage
U3505 GMC — Control Module Supply Circuit 2 Low Voltage

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 Code

1. What are the common symptoms of OBDII code U3505?

The common symptoms of OBDII code U3505 include rough idling, poor engine performance, decreased fuel efficiency, and in some cases, the vehicle may not start.

2. What can cause the OBDII code U3505 to trigger?

The OBDII code U3505, Control Module Supply Circuit 2 Low Voltage, can be triggered by a faulty control module, damaged wiring or connectors, a weak battery, or a failing alternator.

3. How can I diagnose the OBDII code U3505?

Diagnosing the OBDII code U3505 involves using a diagnostic scanner to read the code, checking the voltage levels of the control module supply circuit, inspecting wiring and connectors for damage, and testing the battery and alternator.

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

Some repair tips for fixing OBDII code U3505 include repairing or replacing damaged wiring and connectors, ensuring the battery is in good condition, checking and possibly replacing the alternator if necessary, and resetting the fault code after repairs are completed.

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

It is not recommended to drive your vehicle with OBDII code U3505, as it can lead to further damage to the control module or other electrical components. It is best to address the issue promptly to avoid more severe problems.

6. How much does it cost to repair OBDII code U3505?

The cost to repair OBDII code U3505 can vary depending on the underlying cause of the issue. Costs may include replacing wiring and connectors, repairing the control module, or replacing the battery or alternator if needed.

7. Can a DIY enthusiast fix OBDII code U3505?

A DIY enthusiast with experience in automotive repairs and access to the necessary tools can attempt to fix OBDII code U3505. However, if unsure about the diagnosis or repair process, it is best to consult a professional mechanic.

8. Will resetting the fault code make OBDII code U3505 disappear permanently?

Resetting the fault code for OBDII code U3505 may make the warning light disappear temporarily, but if the underlying issue is not addressed, the code is likely to reappear. It is essential to diagnose and fix the root cause of the problem.

9. How long does it take to repair OBDII code U3505?

The time it takes to repair OBDII code U3505 can vary depending on the complexity of the issue and the availability of parts. Simple repairs like fixing wiring may take a few hours, while more involved repairs could take longer.

10. Is OBDII code U3505 a serious issue?

OBDII code U3505 should be taken seriously as it can affect the performance and drivability of the vehicle. Ignoring this code can lead to more significant problems with the control module and other electrical components.