AutoCodes – Buick – U3502 Buick

U3502 Buick 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 Buick 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 717

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC U3502 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 U3502 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 U3502 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.

Need more information about the U3502 Buick 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 U3502 Buick Code

What does the OBDII code U3502 mean for a Buick?

The U3502 code indicates a problem with the Control Module Supply Circuit 1, specifically that it has detected high voltage in the circuit.

What symptoms might I experience if my Buick has the U3502 code?

Common symptoms include warning lights on the dashboard, issues with vehicle performance, and potential erratic behavior of electronic components.

What could cause the U3502 code to trigger?

Potential causes include a faulty control module, wiring issues such as shorts or open circuits, poor grounding, or an overvoltage condition from the power supply.

How can I diagnose a U3502 code in my Buick?

Start by using an OBD-II scanner to confirm the code. Then, visually inspect the wiring and connectors for damage, check the voltage at the control module, and test the module itself for faults.

What repairs might be needed for a U3502 code?

Repairs may involve replacing damaged wiring, fixing a poor ground connection, or replacing the control module if it is found to be faulty.

Can I continue to drive my Buick if the U3502 code is present?

It is not advisable to continue driving your vehicle with this code, as it may lead to further electrical issues or affect the vehicleâ€™s performance.

Is the U3502 code specific to Buick vehicles?

No, the U3502 code is a generic OBD-II code that can occur in various vehicle makes and models, although its specific implications may vary.

How can I prevent the U3502 code from reoccurring?

Regular maintenance of the vehicle's electrical system, ensuring proper connections, and addressing any electrical issues promptly can help prevent this code from reappearing.

Will clearing the U3502 code fix the problem?

Clearing the code may stop the warning lights temporarily, but it will not fix the underlying issue. It's essential to diagnose and repair the cause of the code to ensure it does not return.