AutoCodes – Generic – U3508

U3508 Code - Control Module Input Power 'C' 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: U3508 indicates Control Module Input Power 'C' 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 1,225

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 U3508 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 U3508 - Control Module Input Power 'C' Circuit Range/Performance - AutoCodes.com — U3508 Code - Control Module Input Power 'C' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC U3508?

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

How to Fix the DTC U3508?

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 U3508 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 U3508 code?

Need more information on how to fix the U3508 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U3508 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U3508 Buick — Control Module Input Power 'C' Circuit Range/Performance
U3508 Cadillac — Control Module Input Power 'C' Circuit Range/Performance
U3508 Chevrolet — Control Module Input Power 'C' Circuit Range/Performance
U3508 GMC — Control Module Input Power 'C' 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 U3508 Code

1. What are the common symptoms of OBDII code U3508?

- Common symptoms include engine performance issues, reduced fuel efficiency, and in some cases, the vehicle may go into a limp mode.

2. What can cause the OBDII code U3508 to trigger?

- The code U3508 is triggered when the control module detects a voltage or resistance issue in the 'C' circuit related to input power.

3. How can I diagnose the cause of the OBDII code U3508?

- Diagnosing the issue involves checking the wiring and connectors related to the 'C' circuit, inspecting the control module, and testing the input power supply.

4. Are there any common repair tips for fixing OBDII code U3508?

- Repair tips include checking for loose or damaged wiring, ensuring proper connections, and replacing any faulty components related to the power input circuit.

5. Can a faulty battery or alternator cause the OBDII code U3508?

- Yes, a weak battery or a failing alternator can sometimes lead to voltage irregularities that trigger the U3508 code.

6. Is it safe to continue driving with the OBDII code U3508 present?

- It is not recommended to drive with the U3508 code present as it can cause further damage to the vehicle and potentially lead to more serious issues.

7. How much does it typically cost to repair OBDII code U3508?

- The cost of repairing the U3508 code can vary depending on the underlying cause, but it may range from $100 to $500, including parts and labor.

8. Can I reset the OBDII code U3508 with a simple scan tool?

- Yes, you can reset the code using an OBDII scan tool, but it is important to diagnose and address the root cause of the issue to prevent the code from reoccurring.

9. Will disconnecting the car battery reset the OBDII code U3508?

- Disconnecting the car battery may temporarily clear the code, but it is not a recommended method as it may erase important data and settings in the vehicle's systems.

10. How can I prevent the OBDII code U3508 from appearing in the future?

- Regular maintenance of the vehicle's electrical system, including checking the battery, alternator, and wiring, can help prevent the U3508 code from reoccurring.