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U0073 Buick Code - Control Module Communication Bus OFF

Quick Answer

When the U0073 Buick code appears, it indicates that there is a communication issue on the control module communication bus in the vehicle. Common causes include Faulty control module, Wiring or connection issues in the communication bus, Software glitches. 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
U0073 Buick indicates Control Module Communication Bus OFF.
Common causes
Common causes include Faulty control module, Wiring or connection issues in the communication bus, Software glitches.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code U0073 Buick Description

When the U0073 Buick code appears, it indicates that there is a communication issue on the control module communication bus in the vehicle. This means that the modules in the vehicle are not able to communicate effectively with each other, leading to potential issues with various systems. The control module communication bus is the network that allows different modules in the vehicle to exchange data and work together to ensure proper functioning of systems like the engine, transmission, ABS, airbags, and more.

OBDII Code U0073 Buick - Control Module Communication Bus OFF
U0073 Buick Code - Control Module Communication Bus OFF

Common Causes of U0073 Buick

  1. Faulty control module
  2. Wiring or connection issues in the communication bus
  3. Software glitches
  4. Water damage or corrosion in the system
  5. Short circuits in the system

Symptoms of U0073 Buick

  1. Dashboard warning lights illuminated
  2. Engine stalling or rough idling
  3. Reduced engine performance
  4. Difficulty starting the vehicle
  5. Transmission shifting issues

How to Fix U0073 Buick

  1. Perform a thorough diagnostic scan to pinpoint the exact cause of the communication issue.
  2. Inspect wiring and connections in the communication bus for any damage or corrosion.
  3. Check the control modules for any faults and replace if necessary.
  4. Clear the code from the system and reset any affected modules.
  5. Test drive the vehicle to ensure the issue has been resolved and that all systems are functioning properly.

Cost to Fix U0073 Buick

The typical repair costs for addressing the U0073 Buick code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, you can expect to pay anywhere from $200 to $500 for parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check with local shops for a more accurate estimate based on your specific situation.

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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 U0073 Buick Code

1. What does OBDII code U0073 mean on a Buick?

U0073 indicates a communication problem in the Control Area Network (CAN) bus, where one or more control modules are unable to communicate properly.

2. What are the common symptoms of code U0073 on a Buick?

Symptoms may include a check engine light, erratic vehicle performance, failure of certain systems like ABS or traction control, and difficulty starting the vehicle.

3. What causes the U0073 code to appear on a Buick?

The code can be caused by a faulty control module, damaged wiring or connectors in the CAN bus network, a weak battery, or issues with the CAN bus itself.

4. Can a weak battery trigger the U0073 code on a Buick?

Yes, a weak or failing battery can cause voltage issues that disrupt communication between control modules, triggering the U0073 code.

5. How can I fix the U0073 code on my Buick?

Start by checking the battery and charging system, inspecting CAN bus wiring and connectors for damage, and scanning for additional codes to pinpoint the faulty module.

6. Is it safe to drive my Buick with the U0073 code?

Driving with this code can lead to unpredictable behavior in critical systems like braking and steering. It’s best to address the issue promptly.

7. How do I diagnose the U0073 code on a Buick?

Use a diagnostic scanner capable of reading CAN bus data to check for module communication issues. Inspect wiring, connectors, and voltage levels for faults.

8. Can a damaged CAN bus wire cause the U0073 code on a Buick?

Yes, damaged or shorted CAN bus wires can disrupt communication between control modules and trigger the U0073 code.

9. Do I need to replace a control module to fix the U0073 code on a Buick?

Not always. The issue could be related to wiring, connectors, or a power/ground fault. Replace a module only if diagnostics confirm it's faulty.

10. How much does it cost to fix the U0073 code on a Buick?

Repair costs vary depending on the cause. Simple fixes like repairing wiring may cost $100-$200, while replacing a control module could cost $500 or more.

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