AutoCodes – GMC – U350A GMC

U350A GMC 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 GMC 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 1,006

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

What does this mean?

What are the Possible Causes of the DTC U350A GMC?

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 GMC?

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 GMC 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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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 GMC Code

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

- Common symptoms include the Check Engine Light illuminating on the dashboard, poor engine performance, and potential issues with other electrical systems in the vehicle.

2. What are the possible causes of OBDII code U350A GMC?

- The code U350A GMC can be caused by a faulty control module, damaged wiring in the supply circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the OBDII code U350A GMC?

- Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the control module and wiring for any visible damage, and testing the voltage levels in the supply circuit.

4. Can a DIYer repair OBDII code U350A GMC?

- Repairing this code may require advanced diagnostic tools and knowledge, making it more suitable for professional technicians. DIYers can check for visible damage but may need assistance for further troubleshooting and repairs.

5. What are some tips for repairing OBDII code U350A GMC?

- Tips for repairing this code include checking and repairing any damaged wiring or connectors, ensuring proper grounding, and verifying the control module's functionality.

6. Is it safe to continue driving with OBDII code U350A GMC?

- It is generally not recommended to continue driving with this code active, as it can lead to further damage to the vehicle's electrical systems and potentially affect engine performance.

7. How much does it cost to repair OBDII code U350A GMC?

- The cost of repairing this code can vary depending on the extent of the issue, the parts needed for replacement, and the labor rates of the repair shop. It is advisable to obtain quotes from multiple service providers.

8. Can OBDII code U350A GMC be triggered by a loose battery connection?

- Yes, a loose or corroded battery connection can potentially cause voltage irregularities in the control module supply circuit, leading to the activation of code U350A GMC.

9. Will resetting the trouble codes clear OBDII code U350A GMC?

- Resetting the trouble codes may temporarily clear the code, but if the underlying issue causing code U350A GMC is not addressed, the code is likely to reappear once the problem resurfaces.

10. How long does it take to repair OBDII code U350A GMC?

- The repair time for OBDII code U350A GMC can vary depending on the complexity of the issue, availability of parts, and the technician's expertise. In some cases, it can be resolved within a few hours, while more extensive repairs may take longer.