AutoCodes – GMC – U2098 2017 GMC Sierra

U2098 2017 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 2017 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 262

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 2017 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 2017 GMC Sierra - MOST Communication Enable Circuit Malfunction - AutoCodes.com — U2098 2017 GMC Sierra Code - MOST Communication Enable Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC U2098 2017 GMC Sierra?

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

How to Fix the DTC U2098 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 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 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.

Need more information about the U2098 2017 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 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code U2098 in a 2017 GMC Sierra?

- Common symptoms of U2098 include issues with the communication system, such as loss of connection with various vehicle modules.

2. What causes the MOST Communication Enable Circuit Malfunction in a 2017 GMC Sierra?

- The U2098 code in a 2017 GMC Sierra is typically caused by problems with the MOST (Media Oriented Systems Transport) communication network, such as wiring issues or faulty components.

3. How serious is the U2098 code in a 2017 GMC Sierra?

- While the U2098 code may not cause immediate drivability issues, it can affect the proper functioning of various vehicle systems that rely on communication between modules.

4. How can I diagnose the U2098 code in a 2017 GMC Sierra?

- Diagnosing the U2098 code requires using a professional OBDII scanner to retrieve the specific fault codes and then conducting a thorough inspection of the MOST communication network components.

5. Can I repair the U2098 code in a 2017 GMC Sierra myself?

- Repairing the U2098 code may require advanced diagnostic and repair skills, so it is recommended to consult a qualified mechanic or technician for proper troubleshooting and repairs.

6. Are there any common fixes for the U2098 code in a 2017 GMC Sierra?

- Common fixes for the U2098 code include checking and repairing any damaged wiring, replacing faulty communication network components, and ensuring proper connections between modules.

7. How much does it cost to repair the U2098 code in a 2017 GMC Sierra?

- Repair costs for the U2098 code can vary depending on the extent of the issue, parts needed for replacement, and labor charges. It is best to get a professional estimate from a reputable repair shop.

8. Will driving my 2017 GMC Sierra with the U2098 code cause further damage?

- Continuing to drive with the U2098 code may lead to potential issues with various vehicle systems that rely on proper communication, so it is advisable to address the problem promptly.

9. Can the U2098 code in a 2017 GMC Sierra trigger other trouble codes?

- Yes, the U2098 code may trigger other related trouble codes if the communication network issue affects multiple systems within the vehicle.

10. How can I prevent the U2098 code from reoccurring in my 2017 GMC Sierra?

- To prevent the U2098 code from reoccurring, it is essential to address any underlying communication network issues, perform regular vehicle maintenance, and address any wiring or component issues promptly.