AutoCodes – GMC – U2098 2014 GMC Sierra

U2098 2014 GMC Sierra Code - MOST Communication Enable Circuit Malfunction

Quick Answer

When the ignition is ON, the Radio initializes the Media Oriented Systems Transport (MOST) bus by sending a short 100 ms low voltage pulse on the electronic control line (or MOST control line) connected to all devices contained on the MOST ring. Common causes include Faulty Radio, Radio harness is open or shorted, Radio 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: U2098 2014 GMC Sierra indicates MOST Communication Enable Circuit Malfunction.
Common causes: Common causes include Faulty Radio, Radio harness is open or shorted, Radio 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 264

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 24, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U2098 2014 GMC Sierra Description

When the ignition is ON, the Radio initializes the Media Oriented Systems Transport (MOST) bus by sending a short 100 ms low voltage pulse on the electronic control line (or MOST control line) connected to all devices contained on the MOST ring. When MOST receive, transmit or control line faults are detected, transmit/receive messages will not receive as expected from the wakeup request. The Radio and the Human Machine Interface Control Module will then perform diagnostics to isolate these MOST faults. If the MOST control line is shorted low to 0 V for an excess amount of time, the Radio and the Audio Amplifier, if equipped, will set a U2098 Diagnostic Trouble Code (DTC), and Human Machine Interface Control Module, if equipped, will set a U0029 02 DTC. At this point, the MOST bus will be unable to communicate until the shorted MOST control line is repaired. The DTC will be set when the Radio senses a short to ground on the MOST control circuit.

OBDII Code U2098 2014 GMC Sierra - MOST Communication Enable Circuit Malfunction - AutoCodes.com — U2098 2014 GMC Sierra Code - MOST Communication Enable Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC U2098 2014 GMC Sierra?

Faulty Radio
Radio harness is open or shorted
Radio circuit poor electrical connection

How to Fix the DTC U2098 2014 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 does this mean?

Code Tech Notes

U2098 00 MOST Communication Enable Circuit Malfunction
U2098 02 MOST Communication Enable Circuit Short to Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U2098 2014 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.

Need more information about the U2098 2014 GMC Sierra code?

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Need Help with the Code?

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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 U2098 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code U2098 in a 2014 GMC Sierra?

The common symptoms include issues with the vehicle's communication systems, such as problems with the radio, navigation system, or other infotainment features.

2. What does the U2098 code "MOST Communication Enable Circuit Malfunction" mean for a 2014 GMC Sierra?

This code indicates a malfunction in the MOST (Media Oriented Systems Transport) communication system, which is responsible for connecting various electronic components in the vehicle.

3. What are the possible causes of the U2098 code in a 2014 GMC Sierra?

Possible causes of this code include damaged wiring or connectors in the MOST network, a faulty control module, or issues with the optical bus communication system.

4. How can I diagnose the U2098 code in my 2014 GMC Sierra?

Diagnosing the U2098 code typically involves inspecting the wiring and connectors in the MOST network, testing the control modules, and checking the optical bus communication system for faults using a diagnostic scanner.

5. Can I still drive my 2014 GMC Sierra with the U2098 code present?

While the vehicle may still be operational with this code, it is recommended to address the issue promptly to prevent further damage to the communication system and other electronic components.

6. How can I repair the U2098 code in my 2014 GMC Sierra?

Repairing the U2098 code may involve replacing damaged wiring or connectors, repairing or replacing the control module, or addressing any faults in the optical bus communication system as needed.

7. Is it necessary to reset the OBDII code U2098 after repairing the issue in a 2014 GMC Sierra?

Yes, it is important to clear the U2098 code using a diagnostic scanner after repairing the underlying issue. This will reset the vehicle's system and turn off the check engine light.

8. Can a DIY enthusiast fix the U2098 code in a 2014 GMC Sierra?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the U2098 code may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

9. How much does it cost to repair the U2098 code in a 2014 GMC Sierra?

The cost of repairing the U2098 code can vary depending on the specific cause of the issue, the extent of the damage, and labor rates. It is advisable to obtain quotes from reputable mechanics for an accurate estimate.

10. Are there any preventive measures to avoid the U2098 code in a 2014 GMC Sierra?

Regularly inspecting the wiring and connectors in the vehicle's communication system, ensuring proper maintenance of electronic components, and addressing any issues promptly can help prevent the occurrence of the U2098 code.