Engine-Codes.com
Engine-Codes – Toyota – U0073 Toyota

U0073 Toyota Code - Control Module Communication Bus Off

Quick Answer

The U0073 code for Toyota vehicles indicates that there is a communication bus off error within the control module. Common causes include Faulty control module, Damaged wiring or connectors in the CAN network, Software glitches or programming errors. 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 Toyota indicates Control Module Communication Bus Off.
Common causes
Common causes include Faulty control module, Damaged wiring or connectors in the CAN network, Software glitches or programming errors.
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 Aug 30, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U0073 Toyota Description

The U0073 code for Toyota vehicles indicates that there is a communication bus off error within the control module. In modern vehicles, various control modules communicate with each other through a network known as the Controller Area Network (CAN). This network allows different modules to share data and work together to ensure proper vehicle operation. When the U0073 code is triggered, it means that there is a communication breakdown between one or more control modules, leading to potential issues with the vehicle's performance and functionality.

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

Common Causes of U0073 Toyota

  1. Faulty control module
  2. Damaged wiring or connectors in the CAN network
  3. Software glitches or programming errors
  4. Water damage or corrosion in the control module
  5. Electrical issues such as a weak battery or alternator

Symptoms of U0073 Toyota

  1. Check engine light illuminated
  2. Loss of communication with one or more control modules
  3. Erratic or inconsistent performance of various vehicle systems
  4. Unresponsive or malfunctioning gauges on the instrument cluster
  5. Difficulty starting the vehicle

How to Fix U0073 Toyota

  1. Perform a visual inspection of the wiring and connectors in the CAN network to check for any damage or corrosion.
  2. Use a diagnostic scan tool to identify which control module(s) are experiencing communication issues.
  3. Check for any software updates or reprogramming that may be available for the affected control modules.
  4. Replace any faulty control modules or damaged wiring as needed to restore proper communication within the network.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure that the issue has been resolved.

Cost to Fix U0073 Toyota

The typical repair costs for addressing a U0073 code in a Toyota vehicle can vary depending on the specific cause of the communication bus off error. In general, the parts and labor required for this repair may range from $200 to $500 or more. It's important to note that diagnostic time and labor rates at auto repair shops can fluctuate based on factors such as location, vehicle make and model, and the complexity of the repair. Customers should inquire about local rates to obtain a more accurate estimate for resolving this issue.

What does this mean?

Tech Notes for U0073 Toyota

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.

Need more information about the U0073 Toyota code?

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

Need Help with the Code?

Get the U0073 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

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 Toyota Code

1. What does the OBDII code U0073 mean on a Toyota?

U0073 indicates a "Control Module Communication Bus Off" fault, meaning there is a loss of communication between control modules on the Controller Area Network (CAN) bus.

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

Symptoms include warning lights on the dashboard (like the check engine light), failure of certain vehicle systems (e.g., ABS or traction control), and possible stalling or starting issues.

3. What causes the U0073 code to appear in a Toyota?

Common causes include a faulty CAN bus wiring or connector, damaged control modules, low battery voltage, or interference from aftermarket devices.

4. Can a weak battery cause the U0073 code in a Toyota?

Yes, a weak or failing battery can cause voltage drops, which may disrupt communication on the CAN bus and trigger the U0073 code.

5. How do you diagnose the U0073 code on a Toyota?

Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting CAN bus wiring and connectors for damage, testing battery voltage, and checking for any faulty control modules.

6. Can an aftermarket device trigger the U0073 code in a Toyota?

Yes, aftermarket devices like remote starters or stereo systems can interfere with the CAN bus and cause communication errors.

7. Is it safe to drive a Toyota with the U0073 code?

It depends on the severity of the issue. While the vehicle may still run, critical safety systems like ABS or traction control could be compromised.

8. How can you fix the U0073 code on a Toyota?

Repairs may include fixing or replacing damaged wiring, connectors, or control modules, and ensuring the battery and charging system are functioning properly.

9. Can clearing the U0073 code solve the problem in a Toyota?

Clearing the code might temporarily turn off the warning light, but the underlying issue must be fixed to prevent the code from returning.

10. How much does it cost to repair the U0073 code on a Toyota?

Repair costs vary depending on the issue, ranging from $50 for simple wiring fixes to several hundred dollars for replacing a control module.

Discuss the causes and fixes for U0073 Toyota OBDII Code

Submit a New Comment

  • This fault first is the abs number two you check can wires if the reach Thier pin to pin position

    Reply to Comment