AutoCodes – Honda – U0029 Honda

U0029 Honda Code - F-CAN Malfunction

Quick Answer

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using F-CAN 'A' and 'B' signal lines. Common causes include F-CAN circuit F-CAN A_H line open, F-CAN circuit F-CAN A_L line open, F-CAN circuit F-CAN A_H line short to ground. 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: U0029 Honda indicates F-CAN Malfunction.
Common causes: Common causes include F-CAN circuit F-CAN A_H line open, F-CAN circuit F-CAN A_L line open, F-CAN circuit F-CAN A_H line short to ground.
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 46,766

How popular is this code, among other codes? Medium

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 19, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U0029 Honda Description

The Controller Area Network (CAN) transmits/receives pulsing signals to/from the control modules simultaneously by using F-CAN 'A' and 'B' signal lines. When the Powertrain Control Module (PCM) cannot send the signals via the F-CAN lines for a set time, the PCM detects a malfunction and stores a Diagnostic Trouble Code (DTC). The DTC will be set when the PCM cannot send any signals via the F-CAN A lines for at least 1 second. When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

OBDII Code U0029 Honda - F-CAN Malfunction - AutoCodes.com — U0029 Honda Code - F-CAN Malfunction

What does this mean?

What are the Possible Causes of the DTC U0029 Honda?

F-CAN circuit F-CAN A_H line open
F-CAN circuit F-CAN A_L line open
F-CAN circuit F-CAN A_H line short to ground
F-CAN circuit F-CAN A_L line short to ground
Faulty Powertrain Control Module (PCM) or the Control Module that sets the code.

How to Fix the DTC U0029 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 does this mean?

Code Tech Notes

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending Diagnostic Trouble Code (DTC), the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12-volt battery.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0029 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 U0029 Honda code?

Need more information on how to fix the U0029 Honda code? Get Access to Factory Service Manuals

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 U0029 Honda Code

1. What are the common symptoms of OBDII code U0029 (F-CAN Malfunction) in a Honda?

The common symptoms include issues with the communication network between control modules, dashboard warning lights, and loss of functionality with various vehicle systems.

2. What are the possible causes of U0029 code in a Honda?

The U0029 code can be caused by a faulty F-CAN network communication failure, damaged wiring or connectors, a malfunctioning control module, or a software issue.

3. How can I diagnose the F-CAN Malfunction code in my Honda?

Diagnosing the U0029 code involves checking the F-CAN network communication, inspecting the wiring and connectors for damage, and using a diagnostic scan tool to pinpoint the exact cause of the malfunction.

4. Can I drive my Honda with the U0029 code present?

It is not recommended to drive your Honda with the U0029 code present, as it can lead to further damage to the vehicle systems and potentially affect its performance and safety.

5. How can I repair the F-CAN Malfunction in my Honda?

Repairing the U0029 code involves fixing any damaged wiring or connectors, replacing faulty control modules, updating software if necessary, and ensuring proper communication between all vehicle systems.

6. Is it necessary to reset the OBDII code U0029 after repairs?

Yes, it is important to reset the U0029 code after completing the necessary repairs to clear the fault code and ensure proper functioning of the vehicle systems.

7. Can a DIY enthusiast fix the U0029 code issue in a Honda?

While some basic troubleshooting steps can be taken by a DIY enthusiast, diagnosing and repairing the F-CAN Malfunction code may require advanced tools and expertise, so it is recommended to consult a professional mechanic.

8. How much does it cost to repair the U0029 code in a Honda?

The cost of repairing the U0029 code can vary depending on the underlying cause of the malfunction, the parts needed for replacement, and the labor charges. It is advisable to get a quote from a trusted mechanic.

9. How long does it take to fix the F-CAN Malfunction in a Honda?

The time required to fix the U0029 code can vary based on the diagnosis, availability of parts, and the complexity of the repair. It may take a few hours to a day to resolve the issue.

10. Are there any preventive measures to avoid the U0029 code in a Honda?

Regular maintenance, timely inspection of wiring and connectors, and addressing any warning lights or unusual symptoms promptly can help prevent the occurrence of the U0029 F-CAN Malfunction code in a Honda.