AutoCodes – Toyota – U0073 2018 Toyota RAV4

U0073 2018 Toyota RAV4 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 2018 Toyota RAV4 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 307

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 2018 Toyota RAV4 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 2018 Toyota RAV4 - Control Module Communication Bus Off - AutoCodes.com — U0073 2018 Toyota RAV4 Code - Control Module Communication Bus Off

What does this mean?

What are the Possible Causes of the DTC U0073 2018 Toyota RAV4?

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 2018 Toyota RAV4?

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 2018 Toyota RAV4 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 2018 Toyota RAV4 Code

1. What does the OBDII code U0073 mean for a 2018 Toyota RAV4?

The U0073 code indicates a "Control Module Communication Bus Off," meaning thereâ€™s a problem with the communication network between control modules in the vehicle.

2. What are the common symptoms of the U0073 code in a 2018 Toyota RAV4?

Common symptoms include warning lights such as the check engine light, issues with electronic systems, failure of certain vehicle functions, or the car not starting.

3. What causes the U0073 code to appear in a 2018 Toyota RAV4?

The code can be triggered by a faulty control module, damaged wiring or connectors in the Controller Area Network (CAN) bus system, or a failing battery or power supply issue.

4. Can a weak battery cause the U0073 code in a Toyota RAV4?

Yes, a weak or failing battery can disrupt the power supply to the control modules, leading to communication issues and triggering the U0073 code.

5. How can I diagnose the U0073 code on my 2018 Toyota RAV4?

Start by checking the battery and charging system, inspecting the CAN bus wiring for damage, and scanning the vehicle with an OBDII scanner that can read manufacturer-specific codes.

6. Is the U0073 code in a 2018 Toyota RAV4 safe to ignore?

No, ignoring this code can lead to further issues with the vehicleâ€™s electronic systems and may result in a breakdown or loss of functionality.

7. How do I fix the U0073 code on my 2018 Toyota RAV4?

Repairs may include replacing damaged wiring or connectors, repairing or replacing a faulty control module, or resolving power supply issues like a weak battery.

8. Can I clear the U0073 code on my Toyota RAV4 without fixing the problem?

Clearing the code without addressing the root cause will only temporarily remove it, and the issue is likely to return.

9. How much does it cost to fix the U0073 code on a 2018 Toyota RAV4?

Repair costs can vary widely depending on the cause, ranging from $50 for minor wiring repairs to $1,000 or more for control module replacement.

10. Do I need a professional mechanic to fix the U0073 code in my Toyota RAV4?

While some basic checks like inspecting the battery and wiring can be done at home, diagnosing and fixing CAN bus communication issues often require a professional with specialized tools and expertise.