AutoCodes – Generic – U350A

U350A Code - Control Module Supply Circuit High Voltage

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: U350A indicates Control Module Supply Circuit High Voltage.
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 820

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 U350A 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 U350A - Control Module Supply Circuit High Voltage - AutoCodes.com — U350A Code - Control Module Supply Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC U350A?

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

How to Fix the DTC U350A?

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 U350A 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 U350A code?

Need more information on how to fix the U350A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U350A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U350A Buick — Control Module Supply Circuit High Voltage
U350A Cadillac — Control Module Supply Circuit High Voltage
U350A Chevrolet — Control Module Supply Circuit High Voltage
U350A GMC — Control Module Supply Circuit High Voltage

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 U350A Code

1. What are common symptoms of OBDII code U350A (Control Module Supply Circuit High Voltage)?

- Common symptoms include illuminated Check Engine Light, poor vehicle performance, and potential stalling or rough idling.

2. What can cause OBDII code U350A to trigger?

- This code is typically triggered by issues such as a faulty control module, damaged wiring, or a malfunctioning power supply.

3. How serious is OBDII code U350A (Control Module Supply Circuit High Voltage)?

- While the severity can vary, it is important to address this code promptly to prevent potential damage to the vehicle's control module or electrical system.

4. How can I diagnose the source of OBDII code U350A?

- Diagnosis usually involves using a professional OBDII scanner to read the code, inspecting wiring for damage, and testing the control module and power supply components.

5. Can I drive my vehicle with OBDII code U350A present?

- It is not recommended to drive the vehicle with this code present, as it may lead to further electrical issues or potential safety hazards.

6. What are some repair tips for resolving OBDII code U350A?

- Repair tips may include checking and repairing damaged wiring, replacing the faulty control module, and ensuring proper voltage supply to the module.

7. How much does it typically cost to fix OBDII code U350A?

- The cost of fixing this code can vary depending on the underlying cause, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix OBDII code U350A at home?

- While some basic troubleshooting and repairs can be done at home, diagnosing and fixing the root cause of this code may require professional expertise and specialized tools.

9. How long does it usually take to repair OBDII code U350A?

- The repair time can vary based on the specific issue causing the code, but it may take a few hours to a full day for a mechanic to diagnose and fix the problem.

10. Is it necessary to clear the OBDII code U350A after repairing the issue?

- Yes, it is important to clear the code after repairing the underlying problem to reset the Check Engine Light and ensure the issue has been resolved successfully.