AutoCodes – Lexus – U0073 Lexus

U0073 Lexus Code - Control Module Communication Bus Off

Quick Answer

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Control Module, Control Module harness is open or shorted. 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 Controller Area Network (CAN) Communication System, Faulty Control Module, Control Module harness is open or shorted.
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 1,503

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 Mar 22, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0073 Lexus Description

The Controller Area Network (CAN) is a standard bus system in vehicles that enables the connection of automotive devices without the need for a host computer. The exchange of operating information and commands among devices is facilitated by pre-programmed information about the required message exchange on the serial data circuits. Communication is carried out using two dedicated wires, known as CAN high and CAN low, with both lines carrying 2.5V when the CAN bus is in idle mode. During the transmission of data bits, the CAN high line increases to 3.75V while the CAN low drops to 1.25V, creating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a message that includes the transmitter device availability has not been received.

OBDII Code U0073 Lexus - Control Module Communication Bus Off - AutoCodes.com — U0073 Lexus Code - Control Module Communication Bus Off

What does this mean?

What are the Possible Causes of the DTC U0073 Lexus?

Faulty Controller Area Network (CAN) Communication System
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0073 Lexus?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0073 Lexus 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 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.