AutoCodes – Generic – U0298

U0298 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 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 15,429

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

What does this mean?

What are the Possible Causes of the DTC U0298?

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?

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 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 U0298 code?

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

Need Help with the Code?

Get the U0298 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U0298 Ford — Lost Communication With DC To DC Converter Control Module 'A'
U0298 Lincoln — Lost Communication With DC To DC Converter Control Module 'A'
U0298 Mercury — Lost Communication With DC To DC Converter Control Module 'A'

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 Code

1. What are common symptoms of OBDII code U0298?

The common symptoms of code U0298 include loss of power steering, dimming or flickering lights, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code U0298?

Possible causes of code U0298 include a faulty DC to DC converter control module, damaged wiring or connectors, low battery voltage, or a software issue.

3. How can I diagnose OBDII code U0298?

Diagnosing code U0298 typically involves using a diagnostic scanner to retrieve the code, checking the wiring and connectors for damage, testing the battery voltage, and inspecting the DC to DC converter control module for faults.

4. Can I still drive my vehicle with OBDII code U0298?

It is not recommended to drive your vehicle with code U0298 as it can lead to potential safety hazards due to loss of power steering and other electrical issues.

5. How can I repair OBDII code U0298?

Repairing code U0298 may involve replacing the faulty DC to DC converter control module, repairing damaged wiring or connectors, ensuring proper battery voltage, and performing any necessary software updates.

6. Is it safe to reset the OBDII code U0298 with a scanner?

While you can reset the code with a scanner, it is important to diagnose and repair the underlying issue causing code U0298 to prevent it from recurring.

7. Can a DIY enthusiast fix OBDII code U0298 at home?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code U0298 at home, but it is recommended to seek professional help if unsure.

8. How much does it cost to fix OBDII code U0298?

The cost of fixing code U0298 can vary depending on the underlying issue, parts needed, and labor costs. It is advisable to get estimates from a trusted mechanic or repair shop.

9. Will OBDII code U0298 cause my vehicle to fail an emissions test?

Code U0298 itself may not directly cause your vehicle to fail an emissions test, but it is important to address the issue promptly to ensure your vehicle is running properly and meeting emissions standards.

10. How do I prevent OBDII code U0298 from occurring in the future?

To prevent code U0298 from occurring in the future, it is important to perform regular maintenance on your vehicle, address any electrical issues promptly, and follow recommended service intervals.