AutoCodes – Chevrolet – U0073 2018 Chevrolet Silverado

U0073 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 507

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Control Module Communication Bus OFF - AutoCodes.com — U0073 2018 Chevrolet Silverado Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the U0073 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 2018 Chevrolet Silverado Code

1. What does the OBDII code U0073 mean on a 2018 Chevrolet Silverado?

The U0073 code indicates a "Control Module Communication Bus OFF," meaning there's a communication issue between the control modules on the vehicle's Controller Area Network (CAN) bus.

2. What are the common symptoms of the U0073 code in a 2018 Chevrolet Silverado?

Symptoms may include illuminated warning lights (e.g., check engine or service stability), intermittent electrical issues, unresponsive modules, or the vehicle failing to start.

3. What causes the U0073 code on a Chevrolet Silverado?

Common causes include faulty wiring or connectors in the CAN bus, a low or weak battery, issues with the communication modules, or a blown fuse related to the CAN system.

4. Can a weak battery cause the U0073 code in a 2018 Silverado?

Yes, a weak or failing battery can disrupt communication between modules and trigger the U0073 code.

5. How do you diagnose the U0073 code on a 2018 Chevrolet Silverado?

Diagnosis typically involves using a scan tool to check for other related codes, inspecting the CAN bus wiring and connectors, testing the battery, and verifying module functionality.

6. Can a blown fuse cause the U0073 code to appear?

Yes, a blown fuse in the circuit powering the CAN bus or related control modules can cause the U0073 code.

7. Is it safe to drive a 2018 Chevrolet Silverado with the U0073 code?

It depends on the severity of the symptoms. If the vehicle has significant electrical issues or fails to start, itâ€™s not safe to drive and should be inspected immediately.

8. What are the repair options for the U0073 code?

Repairs may include replacing damaged wiring or connectors, recharging or replacing the battery, repairing or replacing faulty control modules, or replacing blown fuses.

9. How much does it cost to fix the U0073 code on a Silverado?

Repair costs vary based on the cause but can range from $50 for minor wiring fixes to $500 or more if a module needs replacement.

10. Can clearing the code with a scan tool fix the U0073 issue?

Clearing the code may temporarily turn off the warning light, but it wonâ€™t fix the underlying issue. Proper diagnosis and repair are necessary to prevent the code from returning.