AutoCodes – GMC – U0029 2016 GMC Sierra

U0029 2016 GMC Sierra Code - Media Oriented Systems Transport Bus Performance

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: U0029 2016 GMC Sierra indicates Media Oriented Systems Transport Bus Performance.
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 226

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
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0029 2016 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 MOST bus master device shall set DTC U0029 when the MOST bus interruptions last long enough to interrupt MOST communication and functions, but not long enough to break the MOST bus ring. A current Diagnostic Trouble Code (DTC) sets when MOST bus communication has been interrupted more than 10 times during the monitoring cycle period.

OBDII Code U0029 2016 GMC Sierra - Media Oriented Systems Transport Bus Performance - AutoCodes.com — U0029 2016 GMC Sierra Code - Media Oriented Systems Transport Bus Performance

What does this mean?

What are the Possible Causes of the DTC U0029 2016 GMC Sierra?

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

How to Fix the DTC U0029 2016 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 U0029 2016 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 U0029 2016 GMC Sierra Code

1. What does OBDII code U0029 mean for a 2016 GMC Sierra?

- The U0029 code indicates an issue with the Media Oriented Systems Transport (MOST) Bus Performance in the vehicle's communication system.

2. What are the common symptoms of OBDII code U0029 in a 2016 GMC Sierra?

- Common symptoms include issues with the vehicle's infotainment system, such as radio malfunctions, navigation problems, or display screen errors.

3. What are the possible causes of OBDII code U0029 in a 2016 GMC Sierra?

- The code U0029 can be triggered by damaged wiring, loose connections, faulty components in the MOST network, or a malfunctioning control module.

4. How can I diagnose OBDII code U0029 in my 2016 GMC Sierra?

- To diagnose U0029, a professional diagnostic scan tool is needed to access the vehicle's communication system and pinpoint the exact location of the issue.

5. Can I still drive my 2016 GMC Sierra with OBDII code U0029?

- While the vehicle may still be operable with the U0029 code present, it is recommended to address the issue promptly to prevent further damage to the vehicle's communication system.

6. How do I repair OBDII code U0029 in my 2016 GMC Sierra?

- Repairing U0029 typically involves inspecting and repairing any damaged wiring, securing loose connections, replacing faulty components, or reprogramming the control module as needed.

7. Is it necessary to reset the OBDII code U0029 after repairs in a 2016 GMC Sierra?

- Yes, it is important to reset the code after repairs to clear the fault codes stored in the system and ensure that the issue has been successfully addressed.

8. Can a DIY enthusiast fix OBDII code U0029 in a 2016 GMC Sierra?

- While some basic troubleshooting steps can be taken, diagnosing and repairing U0029 may require specialized tools and expertise, so it is recommended to seek professional help for accurate diagnosis and repair.

9. How much does it typically cost to repair OBDII code U0029 in a 2016 GMC Sierra?

- The cost of repairing U0029 can vary depending on the exact cause of the issue, but it may involve labor costs for diagnosis and repair, as well as potential expenses for replacing components or wiring.

10. Are there any preventative measures to avoid OBDII code U0029 in a 2016 GMC Sierra?

- Regular maintenance checks and inspections of the vehicle's communication system, as well as addressing any electrical issues promptly, can help prevent the occurrence of code U0029 in the future.