AutoCodes – Generic – U2098:02

U2098:02 Code - MOST Communication Enable Circuit Malfunction Short to Ground

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: U2098:02 indicates MOST Communication Enable Circuit Malfunction Short to Ground.
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 322

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
Comments
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Code U2098:02 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 U2098:02 - MOST Communication Enable Circuit Malfunction Short to Ground - AutoCodes.com — U2098:02 Code - MOST Communication Enable Circuit Malfunction Short to Ground

What does this mean?

What are the Possible Causes of the DTC U2098:02?

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

How to Fix the DTC U2098:02?

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 U2098:02 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.