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U0073 Lexus Code - Control Module Communication Bus Off

Quick Answer

The U0073 diagnostic trouble code (DTC) for Lexus vehicles indicates a communication problem with the control module communication bus. Common causes include Faulty Control Module: A malfunctioning control module can disrupt communication on the network, Wiring Issues: Damaged or corroded wiring and connectors can interrupt the flow of data on the communication bus, Software Glitches: Software bugs or programming errors within the control modules can cause communication problems. 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 Lexus indicates Control Module Communication Bus Off.
Common causes
Common causes include Faulty Control Module: A malfunctioning control module can disrupt communication on the network, Wiring Issues: Damaged or corroded wiring and connectors can interrupt the flow of data on the communication bus, Software Glitches: Software bugs or programming errors within the control modules can cause communication problems.
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 09, 2024
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Code U0073 Lexus Description

The U0073 diagnostic trouble code (DTC) for Lexus vehicles indicates a communication problem with the control module communication bus. In modern vehicles, there are multiple control modules that communicate with each other over a network called the Controller Area Network (CAN). When the communication bus is "off," it means that one or more control modules are not able to communicate properly with the rest of the vehicle's systems.

OBDII Code U0073 Lexus - Control Module Communication Bus Off
U0073 Lexus Code - Control Module Communication Bus Off

Common Causes of U0073 Lexus

  1. Faulty Control Module: A malfunctioning control module can disrupt communication on the network.
  2. Wiring Issues: Damaged or corroded wiring and connectors can interrupt the flow of data on the communication bus.
  3. Software Glitches: Software bugs or programming errors within the control modules can cause communication problems.
  4. Faulty CAN Bus: A malfunctioning CAN bus itself can prevent proper communication between control modules.
  5. Water Damage: Water intrusion into the vehicle's electronic components can lead to corrosion and communication issues.

Symptoms of U0073 Lexus

  1. Check Engine Light: The most common symptom associated with the U0073 code is the illumination of the Check Engine Light on the dashboard.
  2. Erratic Behavior: The vehicle may exhibit erratic behavior, such as stalling, hesitation, or sudden loss of power.
  3. Communication Errors: Other control modules may display communication errors when attempting to communicate with the affected module.
  4. Inability to Start: In severe cases, the vehicle may refuse to start due to the communication issues.
  5. Loss of Instrument Cluster Functionality: The instrument cluster may display incorrect or no information due to the lack of communication with the control modules.

How to Fix U0073 Lexus

  1. Diagnose the Issue: Use a professional diagnostic tool to identify the specific control module or wiring causing the communication problem.
  2. Check Wiring and Connectors: Inspect all wiring and connectors for damage, corrosion, or loose connections. Repair or replace as necessary.
  3. Update Software: Check for any available software updates for the control modules and apply them to address any programming errors.
  4. Replace Faulty Control Module: If a control module is determined to be faulty, replace it with a new or remanufactured unit.
  5. Test Communication: After repairs are completed, test the communication between control modules to ensure the issue is resolved.

Cost to Fix U0073 Lexus

The cost of repairing the U0073 code on a Lexus vehicle can vary depending on the specific cause of the communication issue. In general, the repair costs can range from $200 to $800, including parts and labor. However, it is important to note that these are rough estimates, and actual costs may differ based on the location, vehicle make and model, and the severity of the problem. Diagnostic time and labor rates at auto repair shops can also impact the overall cost, with rates typically ranging between $80 and $150 per hour. It is advisable to consult with a qualified mechanic or dealership for a more accurate cost estimate tailored to your specific situation.

What does this mean?

Tech Notes for U0073 Lexus

When there are problems with the way different systems in a vehicle communicate with each other using a technology called Controller Area Network (CAN) communication, Diagnostic Trouble Codes (DTC) are displayed. These codes can be caused by issues with the main bus or branch of the communication network, or with the Electronic Control Units (ECUs) and sensors that make up the different systems. If you see code for both the CAN communication problems and internal or power source problems at the same time, you should focus on fixing the internal or power source problems first.

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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 Lexus Code

1. What does the OBDII code U0073 for a Lexus indicate?

The U0073 code in a Lexus indicates a communication fault on the control module communication bus.

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

Common symptoms of the U0073 code in a Lexus may include issues with the vehicle's transmission, ABS, traction control, or other electronic control modules.

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

Possible causes of the U0073 code in a Lexus include damaged wiring, loose connections, faulty control modules, or a defective communication network.

4. How can I diagnose the U0073 code in my Lexus?

Diagnosing the U0073 code in a Lexus typically involves using a diagnostic scanner to retrieve the trouble codes, checking for any other related codes, inspecting the wiring and connections, and testing the control modules.

5. How can I repair the U0073 code in my Lexus?

To repair the U0073 code in a Lexus, you may need to repair or replace damaged wiring, tighten loose connections, replace faulty control modules, or reprogram the communication network.

6. Can I drive my Lexus with the U0073 code present?

It is not recommended to drive your Lexus with the U0073 code present, as it may cause further damage to the vehicle's electronic control systems and affect its performance.

7. How much does it cost to fix the U0073 code in a Lexus?

The cost of fixing the U0073 code in a Lexus can vary depending on the specific cause of the issue, the required repairs or replacements, and the labor rates of the service provider.

8. Will resetting the trouble codes clear the U0073 code in my Lexus?

Resetting the trouble codes may temporarily clear the U0073 code in a Lexus, but if the underlying issue is not addressed, the code is likely to reappear.

9. Can a DIY enthusiast fix the U0073 code in a Lexus?

Depending on the DIY enthusiast's skill level and access to tools, it may be possible to fix the U0073 code in a Lexus by following repair guides and instructions carefully.

10. How can I prevent the U0073 code from reoccurring in my Lexus?

To prevent the U0073 code from reoccurring in your Lexus, it is essential to address any underlying issues promptly, perform regular maintenance checks, and ensure proper care of the vehicle's electronic systems.

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