AutoCodes – GMC – U0029 2017 GMC Sierra

U0029 2017 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 2017 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 297

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 U0029 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 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 2017 GMC Sierra - Media Oriented Systems Transport Bus Performance - AutoCodes.com — U0029 2017 GMC Sierra Code - Media Oriented Systems Transport Bus Performance

What does this mean?

What are the Possible Causes of the DTC U0029 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 U0029 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 U0029 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 U0029 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code U0029 in a 2017 GMC Sierra?

- Common symptoms include issues with the vehicle's media system, such as problems with radio, navigation, or other entertainment features.

2. What causes the OBDII code U0029 in a 2017 GMC Sierra?

- This code typically indicates a performance issue with the Media Oriented Systems Transport (MOST) bus network, which is responsible for communication between various multimedia components in the vehicle.

3. How can I diagnose the OBDII code U0029 in my 2017 GMC Sierra?

- Diagnosis involves using a professional OBDII scanner to pinpoint the exact location of the fault within the MOST bus network, which may require specialized equipment.

4. Can I repair the OBDII code U0029 issue in my 2017 GMC Sierra myself?

- While some basic troubleshooting like checking for loose connections or damaged wiring can be done by DIY enthusiasts, resolving the underlying problem with the MOST bus network may require professional assistance.

5. Are there any common repair tips for fixing the OBDII code U0029 in a 2017 GMC Sierra?

- Repair tips may include inspecting and repairing any damaged wiring, ensuring proper connections, and updating software for multimedia components in the vehicle.

6. Is it safe to continue driving my 2017 GMC Sierra with the OBDII code U0029 present?

- It is generally not recommended to drive the vehicle with unresolved OBDII codes, as they may indicate potential issues that can affect the vehicle's overall performance and safety.

7. How much does it cost to repair the OBDII code U0029 in a 2017 GMC Sierra?

- Repair costs can vary depending on the exact cause of the issue, but they may include expenses for parts replacement, labor, and diagnostic services.

8. Can resetting the OBDII code U0029 in my 2017 GMC Sierra make it go away permanently?

- Simply resetting the code may temporarily clear the fault, but if the underlying issue with the MOST bus network is not addressed, the code is likely to reappear.

9. Will the OBDII code U0029 in my 2017 GMC Sierra affect the vehicle's overall performance?

- While the code may not directly impact the drivability of the vehicle, it can affect the functionality of the multimedia system and potentially lead to other issues if left unresolved.

10. How can I prevent the OBDII code U0029 from reoccurring in my 2017 GMC Sierra?

- Regular maintenance, timely repairs of any related multimedia system issues, and ensuring proper installation of aftermarket components can help prevent the code from reoccurring.