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U0073 Cadillac Code - Control Module Communication Bus OFF

Quick Answer

The U0073 Cadillac code indicates that the Control Module Communication Bus has been turned off. Common causes include Damaged wiring or connectors in the communication bus network, Faulty control module, Software glitch in the system. 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 Cadillac indicates Control Module Communication Bus OFF.
Common causes
Common causes include Damaged wiring or connectors in the communication bus network, Faulty control module, Software glitch in the system.
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 08, 2024
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Code U0073 Cadillac Description

The U0073 Cadillac code indicates that the Control Module Communication Bus has been turned off. The communication bus is a vital component in modern vehicles that allows different control modules to communicate with each other. When this bus is turned off, it can lead to a breakdown in communication between the various modules, causing issues with the vehicle's performance and functionality.

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

Common Causes of U0073 Cadillac

  1. Damaged wiring or connectors in the communication bus network
  2. Faulty control module
  3. Software glitch in the system
  4. Weak battery or alternator
  5. Water damage or corrosion in the control module

Symptoms of U0073 Cadillac

  1. Check Engine Light is illuminated
  2. Loss of power or acceleration
  3. Transmission shifting issues
  4. Rough idling or stalling
  5. Inability to communicate with vehicle diagnostic tools

How to Fix U0073 Cadillac

  1. Perform a thorough inspection of the wiring and connectors in the communication bus network
  2. Test the control modules for faults and replace any that are malfunctioning
  3. Check for software updates or glitches in the system and reprogram if necessary
  4. Test the battery and alternator for proper voltage output
  5. Clean or replace any corroded components in the control module

Cost to Fix U0073 Cadillac

The typical repair costs for addressing the U0073 Cadillac code can vary depending on the specific cause of the issue. On average, the repair costs for this issue can range from $200 to $600, including parts and labor. However, it's important to note that the actual cost may be higher or lower based on the extent of the damage and the specific repairs needed. Additionally, the diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for U0073 Cadillac

There is a factory service bulletin for the following Cadillac models:
2007-2010 Cadillac Escalade Models
2007-2010 Cadillac XLR
2009-2010 Cadillac Escalade Hybrid
Cadillac Factory Service Bulletin OBDII Code U0073

Need more information about the U0073 Cadillac code?

Need more information on how to fix the U0073 Cadillac code? Get Access to Factory Service Manuals

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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 Cadillac Code

1. What does the OBDII code U0073 for Cadillac mean?

The U0073 code indicates a communication problem between control modules in the vehicle, specifically that the Control Module Communication Bus OFF.

2. What are common symptoms of the U0073 code in a Cadillac?

Common symptoms of the U0073 code may include the check engine light turning on, issues with vehicle stability control systems, transmission problems, and difficulty starting the vehicle.

3. What are possible causes of the U0073 code in a Cadillac?

Possible causes of the U0073 code include faulty wiring or connectors, damaged control modules, software glitches, low battery voltage, or a malfunctioning communication network within the vehicle.

4. How do I diagnose the U0073 code in my Cadillac?

Diagnosing the U0073 code typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, inspecting the wiring and connectors, testing the control modules, and verifying the battery voltage.

5. Can I drive my Cadillac with the U0073 code?

It is not recommended to drive your Cadillac with the U0073 code present, as it can lead to further damage to the vehicle and compromise safety systems. It's best to address the issue promptly.

6. How do I repair the U0073 code in my Cadillac?

Repairing the U0073 code may involve fixing any damaged wiring or connectors, replacing faulty control modules, updating software if necessary, ensuring proper battery voltage, and resetting the fault codes.

7. Can I reset the U0073 code in my Cadillac on my own?

You can reset the U0073 code using a diagnostic scanner that can clear fault codes. However, it is important to address the underlying issue causing the code to prevent it from reoccurring.

8. Will the U0073 code cause my Cadillac to fail an emissions test?

The U0073 code alone may not cause your Cadillac to fail an emissions test, but it indicates a problem with the vehicle's communication system that should be addressed to ensure proper functioning of emissions-related components.

9. How much does it cost to fix the U0073 code in a Cadillac?

The cost to fix the U0073 code in a Cadillac can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to consult a professional mechanic for an accurate cost estimate.

10. Can the U0073 code be prevented in a Cadillac?

While some causes of the U0073 code may be unavoidable, regular vehicle maintenance, keeping the electrical system in good condition, and addressing any communication issues promptly can help prevent the code from appearing.

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