AutoCodes – Honda – B1009 Honda

B1009 Honda Code - MICU Lost Communication With The Combination Switch Control Unit

Quick Answer

The Multiplex Control Unit Module (MICU) monitors the Combination Switch Control Unit. Common causes include Faulty Combination Switch Control Unit, Combination Switch Control Unit harness is open or shorted, Combination Switch Control Unit circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B1009 Honda indicates MICU Lost Communication With The Combination Switch Control Unit.
Common causes: Common causes include Faulty Combination Switch Control Unit, Combination Switch Control Unit harness is open or shorted, Combination Switch Control Unit circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 3,582

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 11, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1009 Honda Description

The Multiplex Control Unit Module (MICU) monitors the Combination Switch Control Unit. The MICU sets the OBDII code when the Combination Switch Control Unit is not to factory specifications.

OBDII Code B1009 Honda - MICU Lost Communication With The Combination Switch Control Unit - AutoCodes.com — B1009 Honda Code - MICU Lost Communication With The Combination Switch Control Unit

What does this mean?

What are the Possible Causes of the DTC B1009 Honda?

Faulty Combination Switch Control Unit
Combination Switch Control Unit harness is open or shorted
Combination Switch Control Unit circuit poor electrical connection
Faulty Multiplex Control Unit Module (MICU)

How to Fix the DTC B1009 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 B1009 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 B1009 Honda code?

Need more information on how to fix the B1009 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1009 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 B1009 Honda Code

1. What are the common symptoms of OBDII code B1009 in a Honda related to the MICU lost communication with the combination switch control unit?

- Common symptoms include non-functioning turn signals, malfunctioning wipers, and issues with the headlights.

2. What could cause the MICU to lose communication with the combination switch control unit in a Honda?

- Possible causes include a faulty combination switch control unit, damaged wiring, or a malfunctioning MICU.

3. How can I diagnose the reason behind the MICU losing communication with the combination switch control unit in my Honda?

- A thorough inspection of the wiring harness, checking for loose connections, and using a diagnostic scanner to read trouble codes can help pinpoint the issue.

4. Can a DIY enthusiast repair the MICU lost communication issue in a Honda with OBDII code B1009?

- While basic troubleshooting like checking connections can be done by a DIYer, complex repairs involving component replacement may require professional intervention.

5. Is it safe to continue driving my Honda with the B1009 code related to the MICU and combination switch control unit communication issue?

- It is not recommended to drive the vehicle with this issue as it can affect critical functions like turn signals and headlights, compromising safety.

6. How much does it typically cost to repair the MICU communication problem with the combination switch control unit in a Honda?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can resetting the OBDII code B1009 in a Honda fix the communication problem between the MICU and combination switch control unit?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying communication issue between the modules.

8. Will disconnecting the battery reset the communication between the MICU and combination switch control unit in a Honda?

- Disconnecting the battery may reset some systems but is unlikely to resolve the communication problem between the MICU and combination switch control unit.

9. Are there any preventive measures to avoid the MICU losing communication with the combination switch control unit in my Honda?

- Regular maintenance checks, avoiding water damage to the electrical system, and addressing any wiring issues promptly can help prevent such communication failures.

10. How long does it usually take to repair the MICU communication issue with the combination switch control unit in a Honda?

- Repair times can vary based on the exact cause of the problem, but it may take a few hours to a day for a professional technician to diagnose and fix the issue.