AutoCodes – Ford – U0073 Ford

U0073 Ford 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 Ford 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 75,552

How popular is this code, among other codes? Medium

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

What does this mean?

What are the Possible Causes of the DTC U0073 Ford?

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 Ford?

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 Ford 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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Need Help with the Code?

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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 Ford Code

1. What are the common symptoms of OBDII code U0073 Ford?

- Common symptoms include the illumination of the check engine light, communication issues with vehicle control modules, and potential drivability issues.

2. What does the OBDII code U0073 Ford indicate?

- The code U0073 indicates a communication bus off error, meaning there is a loss of communication between control modules in the vehicle.

3. What are some possible causes of OBDII code U0073 Ford?

- Possible causes include faulty control modules, wiring issues, loose connections, damaged communication lines, or a defective powertrain control module (PCM).

4. How can I diagnose OBDII code U0073 Ford?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the code, checking for any additional codes, inspecting wiring and connections, and testing control module communication.

5. Can OBDII code U0073 Ford be fixed by resetting the vehicle's computer?

- While resetting the computer may temporarily clear the code, it is important to address the underlying issue causing the communication bus off error to prevent the code from reoccurring.

6. Is it safe to continue driving with OBDII code U0073 Ford present?

- It is generally not recommended to continue driving with the code present, as it can lead to further communication issues between control modules and potentially affect the vehicle's performance.

7. How can I repair OBDII code U0073 Ford?

- Repairing the code may involve repairing or replacing faulty control modules, repairing damaged wiring or connections, or addressing any other specific issues identified during diagnosis.

8. Are there any DIY tips for addressing OBDII code U0073 Ford?

- DIY tips may include checking and tightening connections, inspecting wiring for damage, and ensuring control modules are properly seated and functioning correctly.

9. Can extreme weather conditions cause OBDII code U0073 Ford to trigger?

- Extreme weather conditions, such as high heat or humidity, can sometimes affect control module communication and potentially trigger the U0073 code. Ensuring proper insulation and protection for wiring can help prevent this.

10. How do I prevent OBDII code U0073 Ford from recurring in the future?

- To prevent the code from recurring, it is important to address any underlying issues promptly, perform regular vehicle maintenance, and keep an eye out for any signs of communication problems between control modules.

Discuss the causes and fixes for U0073 Ford OBDII Code

Submit a New Comment

Wajdi
Date: February 9, 2015 at 12:51 am

The U0073 in my car, ford c-max 2006-diesel, is caused by the EGR valve fault due to stepper motor dirt.

Reply to Comment
OBDIITech
Date: February 11, 2015 at 10:37 pm

Thanks for the information!!

Reply to Comment
The Hoff
Date: October 14, 2015 at 10:11 am

Same here, caused by malfunctioning EGR valve in my Focus mk2 1.6 Tdci (DV6)

Reply to Comment
ENMANUEL VARGAS
Date: May 4, 2017 at 12:41 pm

TENGO UNA COLORADO LT CON ESTE CODIGO PERO NO SE CUAL ES EL ARNES QUE TENGO QUE VERIFICAR

Reply to Comment
OBDIITech
Date: May 4, 2017 at 11:43 pm

Que año es su Colorado?

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