AutoCodes – Buick – U350B Buick

U350B Buick Code - Control Module Input Power 'C' 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: U350B Buick indicates Control Module Input Power 'C' 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 747

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 U350B Buick 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 U350B Buick - Control Module Input Power 'C' Circuit Intermittent/Erratic - AutoCodes.com — U350B Buick Code - Control Module Input Power 'C' Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC U350B Buick?

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

How to Fix the DTC U350B Buick?

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 U350B Buick 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 U350B Buick Code

1. What are the common symptoms of OBDII code U350B in a Buick?

- Common symptoms include intermittent or erratic engine performance, stalling, rough idling, and issues with starting the vehicle.

2. What can cause the OBDII code U350B in a Buick?

- This code is typically triggered by a faulty control module or wiring issues related to the input power 'C' circuit.

3. How can I diagnose the OBDII code U350B in my Buick?

- Diagnosis involves using a scan tool to read the code, inspecting the wiring and connectors for damage, and testing the control module's power supply.

4. Can a bad battery or alternator cause code U350B in a Buick?

- Yes, a weak battery or failing alternator can cause voltage fluctuations that may trigger this code. It's recommended to check the battery and charging system.

5. What are some repair tips for fixing OBDII code U350B in a Buick?

- Repair tips include checking and repairing any damaged wiring, replacing the control module if necessary, and ensuring a stable power supply to the module.

6. Is it safe to drive my Buick with the U350B code showing?

- It is not recommended to drive the vehicle for an extended period with this code present, as it can lead to further damage or potential safety issues.

7. Can resetting the code make it go away permanently?

- Resetting the code may clear it temporarily, but if the underlying issue causing the code is not addressed, it is likely to return.

8. How much does it cost to repair OBDII code U350B in a Buick?

- The cost of repair can vary depending on the exact cause of the code and the necessary parts or labor involved. It's best to consult a mechanic for an accurate estimate.

9. Will the OBDII code U350B turn off on its own?

- The code may turn off if the issue causing it resolves itself; however, it's important to diagnose and address the underlying problem to prevent it from reoccurring.

10. Can I fix the OBDII code U350B in my Buick by myself?

- While some DIY enthusiasts may be able to address simpler causes like loose connections, diagnosing and repairing complex issues related to this code may require professional help.