AutoCodes – Chevrolet – U0028 2018 Chevrolet Silverado

U0028 2018 Chevrolet Silverado Code - Media Oriented Systems Transport Bus

Quick Answer

The Media Oriented Systems Transport (MOST) bus consists of a physical ring in which multimedia devices share audio, video and infotainment system control data. Common causes include Faulty Audio Unit (Radio), Audio Unit harness is open or shorted, Audio Unit 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: U0028 2018 Chevrolet Silverado indicates Media Oriented Systems Transport Bus.
Common causes: Common causes include Faulty Audio Unit (Radio), Audio Unit harness is open or shorted, Audio Unit 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 300

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
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0028 2018 Chevrolet Silverado Description

The Media Oriented Systems Transport (MOST) bus consists of a physical ring in which multimedia devices share audio, video and infotainment system control data. Each device on the MOST bus transmits and receives data via the MOST Bus Serial Data (+/- transmit/receive) circuits. The MOST bus diagnostic master is the Radio. The MOST control circuit is connected to each device on the MOST bus. Each device provides a 12 V signal on the MOST control circuit. The Radio initiates communication on the MOST bus at Ignition ON by toggling the MOST control circuit low for 100 ms. Once each device recognizes the wakeup signal from the Radio on the MOST control circuit, they will respond to the Radio on the MOST bus to indicate no faults are present and normal communications will commence. The Diagnostic Trouble Code (DTC) sets when a fault occurs on transmit, receive, electronic control lines, or internal device failure.

OBDII Code U0028 2018 Chevrolet Silverado - Media Oriented Systems Transport Bus - AutoCodes.com — U0028 2018 Chevrolet Silverado Code - Media Oriented Systems Transport Bus

What does this mean?

What are the Possible Causes of the DTC U0028 2018 Chevrolet Silverado?

Faulty Audio Unit (Radio)
Audio Unit harness is open or shorted
Audio Unit circuit poor electrical connection

How to Fix the DTC U0028 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 U0028 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.

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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 U0028 2018 Chevrolet Silverado Code

1. What does the OBDII code U0028 for a 2018 Chevrolet Silverado mean?

The U0028 code on a 2018 Chevrolet Silverado indicates a communication error on the Media Oriented Systems Transport (MOST) Bus system.

2. What are common symptoms of the U0028 OBDII code in a 2018 Chevrolet Silverado?

Common symptoms of the U0028 code in a 2018 Silverado may include loss of audio or video functions, navigation system malfunctions, and issues with the vehicle's infotainment system.

3. What are possible causes of the U0028 code on a 2018 Chevrolet Silverado?

Possible causes of the U0028 code in a 2018 Silverado include faulty MOST Bus components, damaged wiring or connectors in the MOST Bus system, or issues with the vehicle's multimedia system.

4. How can I diagnose the U0028 OBDII code in my 2018 Chevrolet Silverado?

Diagnosing the U0028 code typically involves inspecting the MOST Bus components, checking for loose connections or damaged wiring, and using a diagnostic scanner to identify the specific source of the communication error.

5. Can I drive my 2018 Chevrolet Silverado with the U0028 code present?

It is generally safe to drive your 2018 Silverado with the U0028 code, but it is recommended to address the issue promptly to prevent further damage to the vehicle's multimedia system.

6. How can I repair the U0028 OBDII code in my 2018 Chevrolet Silverado?

Repairing the U0028 code may involve repairing or replacing faulty MOST Bus components, repairing damaged wiring or connectors, or resetting the multimedia system through a software update.

7. Can a DIY enthusiast fix the U0028 code in a 2018 Chevrolet Silverado?

Depending on your experience and tools, a DIY enthusiast may be able to address the U0028 code by checking connections, inspecting wiring, and possibly replacing components. However, complex issues may require professional diagnosis and repair.

8. How much does it cost to repair the U0028 OBDII code in a 2018 Chevrolet Silverado?

Costs to repair the U0028 code can vary depending on the specific issue, parts needed, and labor rates. It is advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

9. Are there any preventive maintenance tips to avoid the U0028 OBDII code in a 2018 Chevrolet Silverado?

To prevent the U0028 code, regularly inspect the multimedia system components, avoid water damage to wiring, and promptly address any issues with audio or video functions in your 2018 Silverado.

10. Can the U0028 OBDII code in a 2018 Chevrolet Silverado reset on its own?

In some cases, the U0028 code may reset on its own after the underlying issue has been resolved. However, it is recommended to diagnose and address the root cause to prevent the code from reoccurring.