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

Quick Answer

The B1255 diagnostic trouble code for Acura vehicles indicates that the Combination Switch Control Unit has lost communication with the Multiplex Integrated Control Unit (MICU). Common causes include Faulty Combination Switch Control Unit, Wiring issues or loose connections, 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 Acura indicates Combination Switch Control Unit Lost Communication With MICU.
Common causes
Common causes include Faulty Combination Switch Control Unit, Wiring issues or loose connections, 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 Acura Description

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

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

Common Causes of B1255 Acura

  1. Faulty Combination Switch Control Unit
  2. Wiring issues or loose connections
  3. Malfunctioning MICU
  4. Water damage or corrosion in the electrical system
  5. Software glitches in the control units

Symptoms of B1255 Acura

  1. Non-functional turn signals
  2. Headlights not working properly
  3. Wipers not responding to controls
  4. Malfunctioning cruise control system
  5. Warning lights illuminated on the dashboard

How to Fix B1255 Acura

  1. Begin by conducting a thorough inspection of the wiring harness and connectors for any signs of damage, corrosion, or loose connections.
  2. Test the Combination Switch Control Unit and MICU using a diagnostic scan tool to identify any faults or communication errors.
  3. Replace the faulty Combination Switch Control Unit or MICU if necessary.
  4. Clear the diagnostic trouble codes from the vehicle's memory and perform a system reset to ensure proper communication between the control units.
  5. Test the repaired systems to verify that the issue has been resolved and that all functions are working correctly.

Cost to Fix B1255 Acura

The cost of repairing a B1255 code on an Acura vehicle can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. In general, the cost of parts for replacing a Combination Switch Control Unit or MICU can range from $200 to $500, while labor costs can add an additional $100 to $300. Overall, the total repair cost for addressing this issue may fall within the range of $300 to $800. It is advisable to consult with a trusted mechanic or dealership to obtain a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that labor rates can vary widely based on location and the type of repair facility.

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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 Acura Code

1. What are common symptoms of OBDII code B1255 in an Acura?

- Common symptoms include malfunctioning turn signals, non-responsive wipers, and issues with other vehicle controls operated by the combination switch.

2. What does the OBDII code B1255 in an Acura indicate?

- The code B1255 indicates a communication failure between the Combination Switch Control Unit and the Multiplex Integrated Control Unit (MICU).

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

- Possible causes include wiring issues, a faulty combination switch control unit, a malfunctioning MICU, or a communication network problem within the vehicle.

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

- Diagnosing the issue may require using a scan tool to communicate with the vehicle's onboard diagnostic system, checking the wiring connections, and testing the components involved in the communication network.

5. Is it safe to continue driving with the B1255 code present in my Acura?

- It is not recommended to drive with the B1255 code present, as it can lead to further electrical issues and potentially impact the vehicle's safety systems.

6. Can I repair the Combination Switch Control Unit communication issue in my Acura myself?

- Depending on your level of automotive experience, you may be able to troubleshoot and repair the issue yourself by checking connections, replacing faulty components, or seeking guidance from a professional mechanic.

7. How much does it typically cost to repair OBDII code B1255 in an Acura?

- The cost of repair can vary depending on the exact cause of the communication failure, the parts needed for replacement, and whether you choose to do the repair yourself or take it to a dealership or mechanic.

8. Will resetting the OBDII code B1255 in my Acura resolve the issue?

- Resetting the code may temporarily clear the error message, but it will not fix the underlying communication problem between the Combination Switch Control Unit and the MICU.

9. Are there any common DIY fixes for resolving the B1255 code in an Acura?

- DIY fixes may include checking and cleaning the wiring connections, ensuring proper grounding, and inspecting for any visible damage or corrosion that may be affecting the communication.

10. How can I prevent the Combination Switch Control Unit communication issue in my Acura in the future?

- Regularly inspecting the electrical components, keeping the connections clean and secure, and addressing any warning signs promptly can help prevent the recurrence of the B1255 code.

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