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B1255 Honda Code - Combination Switch Control Unit Lost Communication With MICU

Quick Answer

The B1255 diagnostic trouble code for Honda vehicles indicates that there is a communication issue between the Combination Switch Control Unit and the Multiplex Integrated Control Unit (MICU). Common causes include Damaged wiring or connectors between the Combination Switch Control Unit and MICU, Faulty Combination Switch Control Unit, Malfunctioning MICU. 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
B1255 Honda indicates Combination Switch Control Unit Lost Communication With MICU.
Common causes
Common causes include Damaged wiring or connectors between the Combination Switch Control Unit and MICU, Faulty Combination Switch Control Unit, Malfunctioning MICU.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code B1255 Honda Description

The B1255 diagnostic trouble code for Honda vehicles indicates that there is a communication issue between the Combination Switch Control Unit and the Multiplex Integrated Control Unit (MICU). The Combination Switch Control Unit is responsible for controlling various functions such as turn signals, headlights, wipers, and cruise control. The MICU, on the other hand, is a central control unit that manages communication between different electronic modules in the vehicle.

OBDII Code B1255 Honda - Combination Switch Control Unit Lost Communication With MICU
B1255 Honda Code - Combination Switch Control Unit Lost Communication With MICU

Common Causes of B1255 Honda

  1. Damaged wiring or connectors between the Combination Switch Control Unit and MICU.
  2. Faulty Combination Switch Control Unit.
  3. Malfunctioning MICU.
  4. Loose connections in the communication network.
  5. Electrical interference or short circuits.

Symptoms of B1255 Honda

  1. Malfunctioning turn signals or headlights.
  2. Inoperative wipers or cruise control.
  3. Dashboard warning lights related to the electrical system.
  4. Loss of communication with other control units in the vehicle.

How to Fix B1255 Honda

  1. Perform a thorough inspection of the wiring and connectors between the Combination Switch Control Unit and MICU.
  2. Test the Combination Switch Control Unit and MICU for proper functionality.
  3. Repair or replace any damaged wiring or connectors.
  4. Replace the faulty Combination Switch Control Unit or MICU if necessary.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure proper communication between the units.

Cost to Fix B1255 Honda

The typical repair costs for addressing the B1255 code can vary depending on the specific cause of the communication loss. In general, the parts required for this repair, such as a new Combination Switch Control Unit or MICU, can range from $200 to $500 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair time varying based on the complexity of the issue. Therefore, the total cost of resolving the B1255 code could range from $300 to $1000 or more, including parts and labor. It is advisable to consult with a trusted mechanic or dealership to get an accurate estimate based on the specific vehicle make and model.

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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 B1255 Honda Code

1. What are common symptoms of OBDII code B1255 in a Honda?

Common symptoms include issues with the turn signals, headlights, windshield wipers, and other functions controlled by the combination switch.

2. What does the OBDII code B1255 Honda indicate?

This code indicates that the Combination Switch Control Unit has lost communication with the Multiplex Integrated Control Unit (MICU) in the vehicle.

3. What are possible causes of the Combination Switch Control Unit losing communication with the MICU?

Possible causes include wiring issues, a faulty combination switch control unit, a malfunctioning MICU, or a poor connection between the two units.

4. How can I diagnose the cause of OBDII code B1255 in my Honda?

Diagnosis typically involves checking the wiring connections between the combination switch control unit and MICU, testing the units for functionality, and using a diagnostic scan tool to retrieve specific error codes.

5. Can I repair OBDII code B1255 in my Honda myself?

Depending on your level of automotive expertise, you may be able to address the issue by checking and repairing wiring connections, replacing the combination switch control unit or MICU if necessary, or seeking professional assistance for a more complex diagnosis and repair.

6. Is it safe to continue driving my Honda with OBDII code B1255 present?

It is recommended to address the issue promptly to ensure proper functioning of essential vehicle controls. Driving with this code present may result in the loss of certain functions controlled by the combination switch.

7. How much does it typically cost to repair OBDII code B1255 in a Honda?

The cost of repairs can vary depending on the underlying cause of the communication loss between the combination switch control unit and MICU. Costs may include parts, labor, and diagnostic fees.

8. Are there any preventative measures to avoid encountering OBDII code B1255 in my Honda?

Regular vehicle maintenance, including checking and ensuring proper connections of electrical components, can help prevent issues like communication loss between the combination switch control unit and MICU.

9. Can weather conditions or water damage contribute to OBDII code B1255 in a Honda?

Yes, exposure to moisture or water damage can potentially lead to communication issues between the combination switch control unit and MICU, triggering OBDII code B1255.

10. How long does it typically take to repair OBDII code B1255 in a Honda?

The repair duration can vary based on the specific cause of the communication loss. Simple fixes like checking and reseating connections may take less time, while more complex repairs involving component replacement or wiring troubleshooting may require more time.

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