AutoCodes – Generic – U3500

U3500 Code - Control Module Input Power 'A' Circuit Range/Performance

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: U3500 indicates Control Module Input Power 'A' Circuit Range/Performance.
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 4,231

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 U3500 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 U3500 - Control Module Input Power 'A' Circuit Range/Performance - AutoCodes.com — U3500 Code - Control Module Input Power 'A' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC U3500?

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

How to Fix the DTC U3500?

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 U3500 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 U3500 code?

Need more information on how to fix the U3500 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3500 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U3500 Buick — Control Module Input Power 'A' Circuit Range/Performance
U3500 Cadillac — Control Module Input Power 'A' Circuit Range/Performance
U3500 Chevrolet — Control Module Input Power 'A' Circuit Range/Performance
U3500 GMC — Control Module Input Power 'A' Circuit Range/Performance

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 U3500 Code

1. What are the common symptoms of OBDII code U3500?

The common symptoms of code U3500 include issues with the control module's input power circuit, such as engine stalling, rough idling, or problems with vehicle starting.

2. What could cause OBDII code U3500 to trigger?

Code U3500 can be triggered by issues such as a faulty control module, damaged wiring in the input power circuit, or a poor electrical connection.

3. How can I diagnose the cause of OBDII code U3500?

Diagnosing code U3500 involves using a scan tool to retrieve the code and checking the control module, wiring, and electrical connections for any signs of damage or malfunction.

4. Can I continue driving with OBDII code U3500 present?

It is not recommended to continue driving with code U3500 present, as it can lead to further damage to the control module or other components of the vehicle.

5. What are some repair tips for fixing OBDII code U3500?

Repair tips for code U3500 may include checking and repairing any damaged wiring in the input power circuit, ensuring a proper electrical connection, or replacing a faulty control module if necessary.

6. How much does it typically cost to repair OBDII code U3500?

The cost of repairing code U3500 can vary depending on the exact cause of the issue, with potential costs ranging from a simple wiring repair to a more expensive control module replacement.

7. Can I reset OBDII code U3500 without fixing the underlying issue?

While you can clear the code temporarily, it will likely reappear if the underlying issue causing code U3500 is not addressed and resolved.

8. Is OBDII code U3500 a common problem in certain vehicle makes and models?

Code U3500 can be more common in certain vehicle makes and models that have known issues with the control module input power circuit or electrical systems.

9. Are there any preventative measures to avoid OBDII code U3500?

Regular vehicle maintenance, including checking and maintaining the electrical components and connections, can help prevent issues that may trigger code U3500.

10. Can a DIY enthusiast fix OBDII code U3500, or is it best left to professionals?

Depending on the complexity of the issue causing code U3500, DIY enthusiasts with experience in automotive repair may be able to address the problem. However, in some cases, it may be best to seek professional help for an accurate diagnosis and repair.