AutoCodes – Cadillac – U3503 Cadillac

U3503 Cadillac 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 Cadillac 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 706

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

What does this mean?

What are the Possible Causes of the DTC U3503 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code? Get Access to Factory Service Manuals

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Get the U3503 Cadillac 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 Cadillac Code

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

- Common symptoms include intermittent or erratic power loss, misfiring, rough idling, and potential stalling of the vehicle.

2. What can cause the OBDII code U3503 to trigger in a Cadillac?

- The code U3503 typically triggers due to issues with the control module input power circuit, such as loose connections, damaged wiring, or a faulty control module.

3. How can I diagnose the cause of OBDII code U3503 in my Cadillac?

- To diagnose the issue, you can perform a visual inspection of the wiring and connectors, check for loose connections, test the control module, and use a diagnostic scanner to analyze the power input circuit.

4. What are some repair tips for fixing OBDII code U3503 in a Cadillac?

- Repair tips include repairing or replacing damaged wiring, ensuring all connections are secure, resetting the code using a diagnostic scanner, and replacing the control module if necessary.

5. Can I drive my Cadillac with the OBDII code U3503 present?

- It is not recommended to drive the vehicle with the U3503 code present, as it can lead to potential power loss or stalling, which can compromise safety and cause further damage to the vehicle.

6. How serious is OBDII code U3503 in a Cadillac?

- OBDII code U3503 should be addressed promptly, as it can impact the performance and safety of the vehicle. Ignoring the issue can lead to more severe problems over time.

7. Will disconnecting the battery reset OBDII code U3503 in a Cadillac?

- Disconnecting the battery may temporarily reset the code, but it is not a permanent solution. It is recommended to diagnose and repair the underlying issue causing the code to prevent it from reoccurring.

8. Can a DIY enthusiast fix OBDII code U3503 in a Cadillac?

- Depending on your skill level and access to tools, DIY enthusiasts may be able to diagnose and repair OBDII code U3503. However, complex electrical issues may require professional assistance.

9. How much does it cost to repair OBDII code U3503 in a Cadillac?

- The cost of repairing OBDII code U3503 can vary depending on the cause of the issue, labor rates, and parts needed. It is recommended to obtain quotes from mechanics or repair shops for an accurate estimate.

10. How long does it take to fix OBDII code U3503 in a Cadillac?

- The time to fix OBDII code U3503 can vary depending on the complexity of the issue and availability of parts. Simple repairs may take a few hours, while more involved repairs could take longer.