AutoCodes – Honda – U0073 Honda

U0073 Honda 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 Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module. 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 Honda indicates Control Module Communication Bus OFF.
Common causes: Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control Module.
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 18,669

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
Cost to Diagnose
FAQs
Comments
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Code U0073 Honda 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 Honda - Control Module Communication Bus OFF - AutoCodes.com — U0073 Honda Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 Honda?

Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s)
Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0073 Honda?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0073 Honda 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.

Need more information about the U0073 Honda code?

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

Need Help with the Code?

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

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 Honda Code

1. What does the OBDII code U0073 for Honda mean?

The U0073 code indicates a communication problem on the control module communication bus in a Honda vehicle.

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

Common symptoms of the U0073 code in a Honda include the check engine light being illuminated, poor engine performance, and potential issues with other vehicle systems.

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

Possible causes of the U0073 code in a Honda include damaged wiring or connectors, faulty control modules, software issues, or a weak battery.

4. How do I diagnose the U0073 code in my Honda?

Diagnosing the U0073 code in a Honda typically involves using a scan tool to retrieve the code, checking for related codes, inspecting the wiring and connectors, and testing the control modules.

5. Can I drive my Honda with the U0073 code?

It is not recommended to drive your Honda with the U0073 code present, as it can affect the vehicle's performance and potentially lead to further damage.

6. How can I repair the U0073 code in my Honda?

Repairing the U0073 code in a Honda may involve repairing or replacing damaged wiring, connectors, or control modules, updating software, or addressing any underlying issues causing the communication problem.

7. Can a weak battery cause the U0073 code in a Honda?

Yes, a weak or failing battery can potentially cause the U0073 code to appear in a Honda due to inadequate power supply affecting communication on the control module bus.

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

Resetting the U0073 code may clear it temporarily, but if the underlying issue causing the communication problem is not addressed, the code is likely to reappear.

9. Is it necessary to visit a Honda dealership for the U0073 code repair?

While visiting a Honda dealership for the U0073 code repair is an option, many independent repair shops and automotive technicians can diagnose and repair this issue as well.

10. How much does it typically cost to repair the U0073 code in a Honda?

The cost of repairing the U0073 code in a Honda can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.