AutoCodes – Mercury – U0298 Mercury

U0298 Mercury Code - Lost Communication With DC To DC Converter Control Module 'A'

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty DC To DC Converter Control Module 'A', DC To DC Converter Control Module 'A' harness is open or shorted, DC To DC Converter Control Module 'A' 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: U0298 Mercury indicates Lost Communication With DC To DC Converter Control Module 'A'.
Common causes: Common causes include Faulty DC To DC Converter Control Module 'A', DC To DC Converter Control Module 'A' harness is open or shorted, DC To DC Converter Control Module 'A' 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 474

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 Apr 06, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0298 Mercury Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the DC To DC Converter Control Module 'A' has not been received.

OBDII Code U0298 Mercury - Lost Communication With DC To DC Converter Control Module 'A' - AutoCodes.com — U0298 Mercury Code - Lost Communication With DC To DC Converter Control Module 'A'

What does this mean?

What are the Possible Causes of the DTC U0298 Mercury?

Faulty DC To DC Converter Control Module 'A'
DC To DC Converter Control Module 'A' harness is open or shorted
DC To DC Converter Control Module 'A' circuit poor electrical connection

How to Fix the DTC U0298 Mercury?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0298 Mercury 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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Need more information on how to fix the U0298 Mercury code? Get Access to Factory Service Manuals

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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 U0298 Mercury Code

1. What does the OBD-II code U0298 mean on a Mercury?

U0298 indicates that the vehicle's primary control module has lost communication with the DC to DC Converter Control Module 'A'.

2. What are the common symptoms of the U0298 code on a Mercury?

Symptoms may include a charging system warning light, reduced power mode, difficulty starting the vehicle, or malfunctioning hybrid/electric system components.

3. What causes the U0298 code to appear on a Mercury?

Common causes include faulty wiring or connectors, a failed DC to DC Converter Control Module, or issues with the vehicleâ€™s communication network (CAN bus).

4. How do I diagnose the U0298 code on my Mercury?

Start by checking the wiring and connectors related to the DC to DC Converter Control Module for damage or corrosion. Then verify module communication using a scan tool.

5. Can I drive my Mercury with the U0298 code active?

Itâ€™s not recommended, as this code may affect the vehicleâ€™s charging system or hybrid/electric functionality, potentially leaving you stranded.

6. How do I fix the U0298 code on a Mercury?

Repairs may involve repairing damaged wiring, replacing faulty connectors, or replacing the DC to DC Converter Control Module if itâ€™s defective.

7. Does the U0298 code mean I need to replace the DC to DC Converter Control Module?

Not necessarily. The issue could also be caused by wiring or communication network problems, so a thorough diagnosis is essential.

8. Can a software update fix the U0298 code on a Mercury?

In some cases, a software update for the control modules may resolve communication issues, but this depends on the specific vehicle and circumstances.

9. What tools are needed to troubleshoot the U0298 code?

Youâ€™ll need an OBD-II scan tool with CAN network diagnosis capabilities, a multimeter for checking wiring, and possibly a wiring diagram for your Mercury model.

10. How much does it cost to repair the U0298 code on a Mercury?

Repair costs vary depending on the root cause, ranging from $100 for simple wiring repairs to $1,000 or more for module replacement and reprogramming.