AutoCodes – Generic – U3502

U3502 Code - Control Module Supply Circuit 1 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: U3502 indicates Control Module Supply Circuit 1 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 3,255

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 U3502 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 U3502 - Control Module Supply Circuit 1 High Voltage - AutoCodes.com — U3502 Code - Control Module Supply Circuit 1 High Voltage

What does this mean?

What are the Possible Causes of the DTC U3502?

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

How to Fix the DTC U3502?

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 U3502 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 U3502 code?

Need more information on how to fix the U3502 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3502 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U3502 Buick — Control Module Supply Circuit 1 High Voltage
U3502 Cadillac — Control Module Supply Circuit 1 High Voltage
U3502 Chevrolet — Control Module Supply Circuit 1 High Voltage
U3502 GMC — Control Module Supply Circuit 1 High 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 U3502 Code

1. What are the common symptoms of OBDII code U3502?

- Common symptoms of code U3502 include the illumination of the Check Engine light on the dashboard, decreased fuel efficiency, and potential issues with the vehicle's performance.

2. What causes the OBDII code U3502 to be triggered?

- The U3502 code is typically triggered by a malfunction in the control module supply circuit 1, resulting in high voltage readings beyond the specified range.

3. How serious is the OBDII code U3502?

- While the U3502 code may not cause immediate harm to the vehicle, it is important to address the underlying issue promptly to prevent potential damage to the control module and other components.

4. Can I continue driving with the OBDII code U3502 present?

- It is generally not recommended to continue driving with the U3502 code illuminated, as unresolved electrical issues can lead to further complications and potential breakdowns.

5. How can I diagnose the OBDII code U3502?

- Diagnosing the U3502 code typically involves using an OBDII scanner to retrieve the specific fault code, followed by a thorough inspection of the control module supply circuit 1 for any visible damage or loose connections.

6. What are some possible repair options for OBDII code U3502?

- Repair options for code U3502 may include repairing or replacing damaged wiring in the control module supply circuit 1, checking and resetting the control module, or seeking professional assistance for further diagnosis and repair.

7. Are there any DIY tips to troubleshoot OBDII code U3502?

- DIY troubleshooting tips for code U3502 may include checking for loose connections, inspecting the control module fuse, and ensuring proper grounding of the control module supply circuit 1.

8. Can a faulty battery cause the OBDII code U3502 to appear?

- Yes, a faulty battery or alternator can potentially cause electrical issues leading to the triggering of code U3502, so it's recommended to check the battery and charging system as part of the diagnostic process.

9. How much does it typically cost to repair OBDII code U3502?

- The cost of repairing the U3502 code can vary depending on the extent of the damage and the specific components needing attention. Costs may range from a simple wiring repair to a replacement of the control module.

10. Is it necessary to clear the OBDII code U3502 after repairs are made?

- Yes, it is important to clear the U3502 code after repairs are made to reset the system and ensure that the issue has been resolved. This can be done using an OBDII scanner or by disconnecting the vehicle's battery for a short period.