AutoCodes – Mercury – U0073 Mercury

U0073 Mercury 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 Mercury 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 924

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U0073 Mercury 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 Mercury - Control Module Communication Bus OFF - AutoCodes.com — U0073 Mercury Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 Mercury?

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 Mercury?

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 Mercury 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 Mercury code?

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

Need Help with the Code?

Get the U0073 Mercury 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 Mercury Code

What does OBDII code U0073 mean?

OBDII code U0073 indicates that there is a communication issue with the control module communication bus, meaning that one or more modules are unable to communicate properly over the network.

What are the common symptoms associated with U0073?

Common symptoms include warning lights on the dashboard, loss of functionality in certain electronic features, erratic behavior in vehicle systems, and diagnostic trouble codes from other modules.

What could cause the U0073 code to trigger?

Causes can include faulty wiring or connectors, a malfunctioning control module, issues with the CAN bus system, or interference from aftermarket devices.

How can I diagnose U0073 effectively?

Start by performing a visual inspection of the wiring and connectors for damage. Use a scan tool to check for additional codes, and test the communication between modules to identify any failures.

What are some common repairs for code U0073?

Repairs may involve repairing or replacing damaged wiring or connectors, updating or reprogramming control modules, or replacing a faulty module that is disrupting communication.

Can I drive my vehicle with a U0073 code?

While it may be possible to drive the vehicle, it is not recommended as it can lead to further issues, including the failure of critical systems. It's best to diagnose and address the problem as soon as possible.

Are there any specific tools needed to diagnose U0073?

Yes, you will need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for testing electrical connections, and possibly a wiring diagram for your vehicle's communication bus.

Is U0073 a serious issue?

Yes, U0073 can be considered serious because it affects the communication between control modules, which can lead to malfunctioning vehicle systems and safety issues.

How can I prevent U0073 from occurring?

Regular maintenance, including checking wiring and connections for wear or damage, ensuring proper installation of aftermarket components, and addressing any electrical issues promptly can help prevent this code from occurring.