AutoCodes – Buick – U3503 Buick

U3503 Buick Code - Control Module Input Power 'A' Circuit Intermittent/Erratic

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: U3503 Buick indicates Control Module Input Power 'A' Circuit Intermittent/Erratic.
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 536

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 U3503 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 U3503 Buick - Control Module Input Power 'A' Circuit Intermittent/Erratic - AutoCodes.com — U3503 Buick Code - Control Module Input Power 'A' Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC U3503 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 U3503 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 U3503 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.

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Need more information on how to fix the U3503 Buick code? Get Access to Factory Service Manuals

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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 U3503 Buick Code

1. What are common symptoms of OBDII code U3503 in a Buick?

- Common symptoms include intermittent or erratic power loss, rough engine performance, and potential issues with starting the vehicle.

2. What can cause the OBDII code U3503 to appear in a Buick?

- The code U3503 typically indicates a problem with the control module input power circuit, which can be caused by damaged wiring, a faulty control module, or loose connections.

3. How serious is the OBDII code U3503 in a Buick?

- The code U3503 can affect the overall performance and drivability of the vehicle. It is recommended to address this issue promptly to prevent further damage.

4. Can I drive my Buick with the OBDII code U3503?

- It is not recommended to drive your Buick with the OBDII code U3503 present, as it can lead to potential safety hazards and further damage to the vehicle.

5. How do I diagnose the OBDII code U3503 in my Buick?

- Diagnosing the U3503 code requires a scan tool to retrieve the code, followed by inspecting the control module input power wiring, connectors, and the control module itself for any signs of damage or corrosion.

6. Can I repair the OBDII code U3503 in my Buick myself?

- While some minor repairs like checking and cleaning connectors can be done by DIY enthusiasts, diagnosing and repairing the underlying cause of the U3503 code may require professional assistance.

7. How much does it cost to fix the OBDII code U3503 in a Buick?

- The cost of fixing the U3503 code can vary depending on the exact cause of the issue. It is recommended to obtain a diagnostic from a qualified mechanic to get an accurate estimate.

8. Are there any preventive measures to avoid the OBDII code U3503 in a Buick?

- Regular maintenance, including checking the wiring and connectors related to the control module input power, can help prevent issues that may trigger the U3503 code.

9. Can weather conditions affect the occurrence of the OBDII code U3503 in a Buick?

- Extreme weather conditions, such as excessive heat or moisture, can potentially impact the control module input power circuit and contribute to the intermittent or erratic behavior triggering the U3503 code.

10. Will resetting the OBDII code U3503 in my Buick make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the U3503 code is not addressed, it is likely to reappear. It is crucial to diagnose and repair the root cause of the problem to prevent future occurrences.