AutoCodes – Honda – U0028 Honda

U0028 Honda Code - F-CAN Communication Circuit Error

Quick Answer

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (CANH and CANL). Common causes include Reprogram Engine Control Module (ECM), Faulty Engine Control Module, Engine Control Module harness is open or shorted. 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: U0028 Honda indicates F-CAN Communication Circuit Error.
Common causes: Common causes include Reprogram Engine Control Module (ECM), Faulty Engine Control Module, Engine Control Module harness is open or shorted.
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 18,417

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 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0028 Honda Description

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using two signal lines (CANH and CANL). When the Engine Control Module (ECM) does not receive the signals via the CAN lines for more than a set time, the ECM detects a malfunction and a Diagnostic Trouble Code (DTC) is stored.

OBDII Code U0028 Honda - F-CAN Communication Circuit Error - AutoCodes.com — U0028 Honda Code - F-CAN Communication Circuit Error

What does this mean?

What are the Possible Causes of the DTC U0028 Honda?

Reprogram Engine Control Module (ECM)
Faulty Engine Control Module
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U0028 Honda?

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 U0028 Honda 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 U0028 Honda code?

Need more information on how to fix the U0028 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U0028 Honda code diagnosed by a professional: Find a repair shop in your area

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 U0028 Honda Code

1. What are the common symptoms of OBDII code U0028 in a Honda vehicle?

- Common symptoms include issues with the communication system, such as the loss of communication with various control modules, malfunction indicator light (MIL) illumination, and potential drivability issues.

2. What does the U0028 OBDII code indicate in a Honda car?

- The U0028 code specifically points to a communication circuit error within the F-CAN (Fast Controller Area Network) system of the vehicle.

3. What are the possible causes of the U0028 F-CAN Communication Circuit Error in a Honda?

- Potential causes include wiring harness issues, loose connections, faulty control modules, software glitches, or even water damage to the communication system components.

4. How can I diagnose the U0028 code in my Honda vehicle?

- Diagnosing the U0028 code typically involves using a diagnostic scanner to retrieve the code, checking for other related codes, inspecting wiring and connectors, and performing communication tests between control modules.

5. What are some tips for repairing the U0028 code in a Honda?

- Repair tips may include checking and repairing any damaged wiring, ensuring all connections are secure, updating control module software if necessary, and performing a thorough inspection of the F-CAN communication system.

6. Can driving with the U0028 OBDII code present cause further damage to my Honda?

- While driving with the U0028 code may not immediately cause major issues, it is recommended to address the problem promptly to prevent potential communication failures between critical control modules.

7. Is it possible to reset the U0028 code in a Honda without fixing the underlying issue?

- While clearing the code may temporarily turn off the MIL light, the underlying issue causing the U0028 code will persist until properly diagnosed and repaired.

8. How much does it typically cost to repair the U0028 F-CAN Communication Circuit Error in a Honda?

- The cost of repair can vary depending on the cause of the issue, but it may range from a simple fix involving wiring repair to a more complex repair involving control module replacement.

9. Can I fix the U0028 code in my Honda at home, or do I need to take it to a professional mechanic?

- Depending on your skills and experience with automotive diagnostics and repairs, you may be able to address the U0028 code at home. However, complex electrical issues may require the expertise of a professional mechanic.

10. How can I prevent the recurrence of the U0028 code in my Honda in the future?

- To prevent the U0028 code from reoccurring, it is essential to perform regular maintenance checks, address any wiring or connection issues promptly, and ensure that all control modules are functioning correctly.