AutoCodes – GMC – U0028 2017 GMC Sierra

U0028 2017 GMC Sierra 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 2017 GMC Sierra 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 330

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 2017 GMC Sierra 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 2017 GMC Sierra - Media Oriented Systems Transport Bus - AutoCodes.com — U0028 2017 GMC Sierra Code - Media Oriented Systems Transport Bus

What does this mean?

What are the Possible Causes of the DTC U0028 2017 GMC Sierra?

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

How to Fix the DTC U0028 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 U0028 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.

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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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code U0028 in a 2017 GMC Sierra related to the Media Oriented Systems Transport Bus?

The common symptoms include issues with the vehicle's infotainment system, loss of communication with multimedia components, and possibly a malfunctioning audio system.

2. What are the possible causes of OBDII code U0028 in a 2017 GMC Sierra?

The code U0028 in a 2017 GMC Sierra typically indicates a communication error on the Media Oriented Systems Transport Bus, which can be caused by a faulty multimedia module, wiring issues, or a software glitch.

3. How can I diagnose the OBDII code U0028 in a 2017 GMC Sierra?

Diagnosing the code U0028 involves checking the connections and wiring related to the Media Oriented Systems Transport Bus, testing the multimedia module, and using a diagnostic scanner to retrieve specific fault codes.

4. What are some repair tips for resolving the OBDII code U0028 in a 2017 GMC Sierra?

Repair tips may include checking and repairing any damaged wiring, resetting the multimedia module, updating software if available, or replacing the multimedia module if necessary.

5. Can I drive my 2017 GMC Sierra with the OBDII code U0028 present?

While the vehicle may still be operable with the code U0028 present, it is recommended to address the issue promptly to prevent further damage to the multimedia system and ensure proper communication within the vehicle's network.

6. Does resetting the OBDII code U0028 in a 2017 GMC Sierra fix the underlying issue?

Resetting the code may temporarily clear the fault code, but if the underlying issue causing the U0028 code is not addressed, it is likely to reappear. Proper diagnosis and repair are necessary for a long-term solution.

7. Is the repair for OBDII code U0028 in a 2017 GMC Sierra covered under warranty?

Depending on the vehicle's warranty status and the specific cause of the U0028 code, the repair may be covered under warranty. It is recommended to check with your GMC dealership or warranty provider for more information.

8. Can a DIY enthusiast fix the OBDII code U0028 issue in a 2017 GMC Sierra?

While some basic troubleshooting steps can be performed by a DIY enthusiast, diagnosing and repairing the U0028 code related to the Media Oriented Systems Transport Bus may require specialized tools and expertise, so professional assistance is often recommended.

9. How much does it cost to repair the OBDII code U0028 in a 2017 GMC Sierra?

The cost of repairing the U0028 code can vary depending on the specific cause of the issue, parts needed for replacement, and labor charges. It is advisable to obtain quotes from reputable automotive technicians or dealerships for an accurate estimate.

10. How can I prevent the OBDII code U0028 from reoccurring in my 2017 GMC Sierra?

Regular maintenance, timely software updates, and addressing any wiring or connection issues promptly can help prevent the recurrence of the U0028 code related to the Media Oriented Systems Transport Bus in a 2017 GMC Sierra.