AutoCodes – GMC – U0073 2014 GMC Sierra

U0073 2014 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 2014 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 422

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
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Code U0073 2014 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 2014 GMC Sierra - Control Module Communication Bus OFF - AutoCodes.com — U0073 2014 GMC Sierra Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

What does the OBDII code U0073 mean in a 2014 GMC Sierra?

U0073 indicates a communication issue on the control module communication bus, meaning that one or more control modules in the vehicle are not communicating properly.

What are the common symptoms of the U0073 code?

Common symptoms include warning lights on the dashboard, such as the check engine light, erratic instrument panel behavior, loss of power to various systems, or failure of certain functions like cruise control or stability control.

What could cause the U0073 code to trigger in my GMC Sierra?

Possible causes include faulty wiring or connectors in the communication bus, a malfunctioning control module, a dead battery or poor battery connections, and software issues in the vehicle's modules.

How can I diagnose the U0073 code?

Start by checking for any other stored codes, inspecting the wiring and connectors related to the communication bus, and testing the affected control modules for proper function. A professional scan tool may be needed for deeper diagnostics.

What should I do if my Sierra shows the U0073 code?

If you see the U0073 code, it's advisable to take the vehicle to a qualified mechanic or dealership for a thorough inspection and proper diagnosis, as it may require specialized tools and knowledge.

Can I drive my GMC Sierra with the U0073 code?

While it may be possible to drive the vehicle, it is not recommended, as the communication issues can lead to loss of critical functions and may pose safety risks.

What repairs are commonly needed to fix the U0073 code?

Repairs may involve fixing or replacing damaged wiring or connectors, reprogramming or replacing the affected control module, or addressing any underlying electrical issues.

How much could it cost to repair the U0073 code?

Repair costs can vary widely depending on the specific issue, but you may expect to pay anywhere from $100 to $1,000 or more, depending on whether it involves simple repairs or module replacement.

Is the U0073 code specific to GMC vehicles?

No, the U0073 code is a generic OBDII trouble code that can occur in various makes and models of vehicles, not just GMC. It relates to general communication issues among control modules.

Can I reset the U0073 code myself?

You can attempt to reset the code using an OBDII scanner, but if the underlying issue is not resolved, the code is likely to reappear. Itâ€™s best to diagnose and fix the root cause before resetting.