AutoCodes – GMC – U0073 2017 GMC Sierra

U0073 2017 GMC Sierra Code - Control Module Communication Bus OFF

Quick Answer

Modules connected to the high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Module/Device that is not communicating, Module/Device harness is open or shorted, Module/Device circuit poor electrical connection. 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 GMC Sierra indicates Control Module Communication Bus OFF.
Common causes: Common causes include Faulty Module/Device that is not communicating, Module/Device harness is open or shorted, Module/Device circuit poor electrical connection.
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 373

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 Jul 19, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0073 2017 GMC Sierra Description

Modules connected to the high-speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages need to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) will be set when the device setting the DTC has attempted to establish communications on the serial data circuits more than 3 times in 5 s.

OBDII Code U0073 2017 GMC Sierra - Control Module Communication Bus OFF - AutoCodes.com — U0073 2017 GMC Sierra Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 2017 GMC Sierra?

Faulty Module/Device that is not communicating
Module/Device harness is open or shorted
Module/Device circuit poor electrical connection

How to Fix the DTC U0073 2017 GMC Sierra?

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 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra Code

1. What does the OBDII code U0073 for a 2017 GMC Sierra mean?

When you see the U0073 code, it indicates a Control Module Communication Bus OFF error.

2. What are the common symptoms of the U0073 code in a 2017 GMC Sierra?

Common symptoms include multiple warning lights illuminated on the dashboard, loss of communication with various control modules, and potential drivability issues.

3. What are the possible causes of the U0073 code in a 2017 GMC Sierra?

Potential causes of the U0073 code include faulty wiring or connectors, a defective control module, a communication bus malfunction, or software issues.

4. How can I diagnose the U0073 code in my 2017 GMC Sierra?

Diagnosing the U0073 code typically involves checking the wiring and connectors for damage, testing the control modules for proper function, and using a diagnostic scanner to assess communication on the bus network.

5. Can I still drive my 2017 GMC Sierra with the U0073 code present?

It is not recommended to drive your vehicle with the U0073 code active, as it can lead to further issues and potential safety risks. It's best to address the problem promptly.

6. How can I repair the U0073 code in my 2017 GMC Sierra?

Repairing the U0073 code may involve repairing or replacing damaged wiring or connectors, reprogramming control modules, resetting the communication bus, or seeking assistance from a professional technician.

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

Resetting the code may clear it temporarily, but if the underlying issue causing the U0073 code is not addressed, it is likely to reoccur. It's important to diagnose and repair the root cause of the problem.

8. Can a DIY enthusiast fix the U0073 code in a 2017 GMC Sierra?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the U0073 code may require specialized tools and expertise. It's best to consult a professional technician for proper diagnosis and repair.

9. Is the U0073 code specific to the 2017 GMC Sierra?

The U0073 code is a generic communication error code that can appear in various vehicle makes and models, not exclusive to the 2017 GMC Sierra.

10. How much does it typically cost to repair the U0073 code in a 2017 GMC Sierra?

The cost of repairing the U0073 code can vary depending on the extent of the issue, the parts needed for repair, and the labor rates of the repair shop. It is advisable to obtain a diagnosis and repair estimate from a qualified technician.