AutoCodes – Toyota – U0073 2017 Toyota RAV4

U0073 2017 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 2017 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 2017 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 2017 Toyota RAV4 - Control Module Communication Bus Off - AutoCodes.com — U0073 2017 Toyota RAV4 Code - Control Module Communication Bus Off

What does this mean?

What are the Possible Causes of the DTC U0073 2017 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 2017 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 2017 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 2017 Toyota RAV4 Code

1. What does the OBDII code U0073 on a 2017 Toyota RAV4 mean?

The U0073 code in a 2017 Toyota RAV4 indicates a Control Module Communication Bus Off error.

2. What are the common symptoms of the U0073 code in a 2017 Toyota RAV4?

Common symptoms of the U0073 code may include issues with communication between control modules, dashboard warning lights, and potential problems with vehicle performance.

3. What are the possible causes of the U0073 code in a 2017 Toyota RAV4?

Potential causes of the U0073 code include faulty wiring, loose connections, damaged control modules, or issues with the communication network within the vehicle.

4. How can I diagnose the U0073 code in my 2017 Toyota RAV4?

Diagnosing the U0073 code may involve using an OBDII scanner to read the code, checking the wiring and connections between control modules, and performing a thorough inspection of the communication network.

5. How can I repair the U0073 code in my 2017 Toyota RAV4?

Repairing the U0073 code may involve repairing or replacing damaged wiring, securing loose connections, resetting the control modules, or replacing any faulty control modules.

6. Can I drive my 2017 Toyota RAV4 with the U0073 code present?

It is not recommended to drive your vehicle with the U0073 code present, as it may lead to further communication issues between control modules and potentially affect the overall performance and safety of the vehicle.

7. How much does it cost to repair the U0073 code in a 2017 Toyota RAV4?

The cost of repairing the U0073 code in a 2017 Toyota RAV4 can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor costs at the repair shop.

8. Will clearing the U0073 code make it go away permanently?

Clearing the U0073 code may temporarily remove the warning light, but if the underlying issue causing the code is not addressed, the code is likely to reappear once the vehicle is driven again.

9. Can a DIY enthusiast fix the U0073 code in a 2017 Toyota RAV4?

While some aspects of diagnosing and repairing the U0073 code may be within reach of a DIY enthusiast, it is recommended to seek professional help for thorough diagnosis and proper repair to avoid further complications.

10. How often does the U0073 code occur in a 2017 Toyota RAV4?

The U0073 code is relatively uncommon in a 2017 Toyota RAV4, but it can occur due to various factors affecting the communication between control modules.