AutoCodes – Chevrolet – U3503 Chevrolet

U3503 Chevrolet 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 Chevrolet 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 691

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

What does this mean?

What are the Possible Causes of the DTC U3503 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 U3503 Chevrolet code?

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

Need Help with the Code?

Get the U3503 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

1. What are common symptoms of OBDII code U3503 in a Chevrolet related to Control Module Input Power 'A' Circuit Intermittent/Erratic?

- Common symptoms include intermittent or erratic engine performance, stalling, rough idling, and issues with starting the vehicle.

2. What are possible causes of OBDII code U3503 in a Chevrolet?

- Possible causes include faulty wiring or connectors in the control module input power circuit, a weak or failing control module, or issues with the power supply to the control module.

3. How can I diagnose OBDII code U3503 in my Chevrolet?

- Diagnosing this code typically involves inspecting the wiring and connectors in the control module input power circuit, testing the control module itself, and checking the power supply to the module using a multimeter.

4. Can I drive my Chevrolet with OBDII code U3503 present?

- It is not recommended to drive your vehicle with this code present, as it can lead to potential engine performance issues and further damage if left unaddressed.

5. How can I repair OBDII code U3503 in my Chevrolet?

- Repairing this code often involves repairing or replacing damaged wiring or connectors in the control module input power circuit, replacing the control module if faulty, and ensuring a stable power supply to the module.

6. Will resetting the OBDII code U3503 in my Chevrolet make it go away permanently?

- Simply clearing the code without addressing the underlying issue will not make it go away permanently. It is essential to diagnose and repair the root cause of the code to prevent it from reoccurring.

7. Is it necessary to visit a mechanic for OBDII code U3503 in my Chevrolet, or can I fix it myself?

- Depending on your level of automotive knowledge and experience with electrical systems, you may be able to troubleshoot and repair this code yourself. However, seeking professional help is recommended for accurate diagnosis and proper repair.

8. How urgent is it to address OBDII code U3503 in my Chevrolet?

- It is advisable to address this code promptly to prevent potential engine performance issues, stalling, or other related problems that can arise from an intermittent or erratic control module input power circuit.

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

- Yes, extreme weather conditions, particularly temperature fluctuations, can sometimes exacerbate issues related to the control module input power circuit, leading to intermittent or erratic behavior triggering this code.

10. Are there any preventive maintenance measures I can take to avoid OBDII code U3503 in my Chevrolet?

- Ensuring regular inspection of electrical components, maintaining a stable power supply system, and promptly addressing any wiring issues can help prevent the occurrence of OBDII code U3503 in your Chevrolet.