AutoCodes – GMC – U2098 2018 GMC Sierra

U2098 2018 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 2018 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 285

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 2018 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 2018 GMC Sierra - MOST Communication Enable Circuit Malfunction - AutoCodes.com — U2098 2018 GMC Sierra Code - MOST Communication Enable Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC U2098 2018 GMC Sierra?

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

How to Fix the DTC U2098 2018 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 2018 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 2018 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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code U2098 in a 2018 GMC Sierra?

- Common symptoms include issues with the vehicle's communication systems, such as the loss of communication with modules or sensors.

2. What does the U2098 code "MOST Communication Enable Circuit Malfunction" indicate in a 2018 GMC Sierra?

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

3. What are some possible causes of the U2098 code in a 2018 GMC Sierra?

- Possible causes include wiring problems, damaged connectors, faulty modules, or issues with the MOST communication network.

4. How can I diagnose the U2098 code in a 2018 GMC Sierra?

- Diagnosing the U2098 code typically involves inspecting the wiring, connectors, and modules related to the MOST communication system using a diagnostic scanner.

5. Can I still drive my 2018 GMC Sierra with the U2098 code present?

- It is not recommended to drive the vehicle with the U2098 code present, as it may lead to further communication issues and potential safety hazards.

6. How can I repair the U2098 code in a 2018 GMC Sierra?

- Repairing the U2098 code may involve fixing wiring issues, replacing damaged connectors, addressing faulty modules, or repairing the MOST communication network.

7. Is it necessary to reset the OBDII system after repairing the U2098 code in a 2018 GMC Sierra?

- Yes, it is recommended to reset the OBDII system after repairing the U2098 code to clear the fault code and ensure proper system functionality.

8. Can a DIY enthusiast fix the U2098 code issue in a 2018 GMC Sierra?

- While some basic diagnostics and repairs can be done by a DIY enthusiast, complex issues related to the U2098 code may require professional expertise and specialized tools.

9. How much does it typically cost to repair the U2098 code in a 2018 GMC Sierra?

- The cost of repairing the U2098 code can vary depending on the extent of the issue, parts needed for replacement, and labor costs at a repair shop.

10. Are there any known recalls or service bulletins related to the U2098 code in a 2018 GMC Sierra?

- It is advisable to check with a GMC dealership or refer to official sources for any recalls or service bulletins related to the U2098 code in a 2018 GMC Sierra.