AutoCodes – GMC – U2098 2015 GMC Sierra

U2098 2015 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 2015 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 237

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 2015 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 2015 GMC Sierra - MOST Communication Enable Circuit Malfunction - AutoCodes.com — U2098 2015 GMC Sierra Code - MOST Communication Enable Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC U2098 2015 GMC Sierra?

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

How to Fix the DTC U2098 2015 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 2015 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 U2098 2015 GMC Sierra Code

1. What does the OBDII code U2098 on a 2015 GMC Sierra mean?

The code U2098 indicates a MOST (Media Oriented Systems Transport) communication enable circuit malfunction in the vehicle.

2. What are the common symptoms of a MOST Communication Enable Circuit Malfunction (U2098) on a 2015 GMC Sierra?

Common symptoms include issues with the vehicle's infotainment system, loss of communication with certain modules, and warning lights on the dashboard.

3. What are the possible causes of the U2098 code on a 2015 GMC Sierra?

The code U2098 can be triggered by damaged wiring, faulty connectors, issues with the MOST bus system, or a malfunctioning control module.

4. How can I diagnose a MOST Communication Enable Circuit Malfunction (U2098) on my 2015 GMC Sierra?

Diagnosis typically involves checking the wiring and connectors related to the MOST bus system, as well as scanning the vehicle's modules for communication errors.

5. Can I still drive my 2015 GMC Sierra with the U2098 code present?

It is generally not recommended to drive the vehicle with unresolved communication system issues, as it may lead to further electrical problems and potentially affect the vehicle's drivability.

6. How can I repair a U2098 code on my 2015 GMC Sierra?

Repair options may include repairing or replacing damaged wiring and connectors, addressing any issues with the MOST bus system, and resetting the communication modules.

7. Is resetting the vehicle's computer a possible solution for the U2098 code on a 2015 GMC Sierra?

In some cases, resetting the vehicle's computer may temporarily clear the code, but it is crucial to diagnose and address the underlying issue to prevent the code from reoccurring.

8. Can a DIY enthusiast fix the U2098 code on a 2015 GMC Sierra, or is professional help required?

While some basic checks like inspecting wiring and connectors can be done by a DIY enthusiast, diagnosing and repairing complex communication system issues may require professional help.

9. How much does it typically cost to repair a MOST Communication Enable Circuit Malfunction (U2098) on a 2015 GMC Sierra?

Repair costs can vary depending on the extent of the issue, with expenses ranging from a simple wiring repair to potentially replacing a control module or addressing bus system problems.

10. Are there any preventive measures to avoid the U2098 code on a 2015 GMC Sierra in the future?

Regularly checking the vehicle's wiring, connectors, and communication systems, as well as addressing any electrical issues promptly, can help prevent the recurrence of the U2098 code.