AutoCodes – Generic – B2A04

B2A04 Code - Microphone Circuit

Quick Answer

The Diagnostic Trouble Code (DTC) sets when the Microphone Circuit is not to factory specifications. Common causes include Faulty Microphone, Microphone harness is open or shorted, Microphone circuit poor electrical connection. 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: B2A04 indicates Microphone Circuit.
Common causes: Common causes include Faulty Microphone, Microphone harness is open or shorted, Microphone circuit poor electrical connection.
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 6,073

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 Feb 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2A04 Description

The Diagnostic Trouble Code (DTC) sets when the Microphone Circuit is not to factory specifications.

OBDII Code B2A04 - Microphone Circuit - AutoCodes.com — B2A04 Code - Microphone Circuit

What does this mean?

What are the Possible Causes of the DTC B2A04?

Faulty Microphone
Microphone harness is open or shorted
Microphone circuit poor electrical connection
Faulty Data Communication Module (DCM)

How to Fix the DTC B2A04?

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 B2A04 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 B2A04 code?

Need more information on how to fix the B2A04 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2A04 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2A04 Subaru — Microphone Circuit

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 B2A04 Code

1. What are common symptoms of OBDII code B2A04 (Microphone Circuit)?

- Common symptoms include a malfunctioning microphone, loss of voice command functionality, and issues with hands-free calling.

2. What typically causes OBDII code B2A04 (Microphone Circuit) to trigger?

- The code is usually triggered by a faulty microphone, damaged wiring in the microphone circuit, or a problem with the hands-free calling system.

3. How can I diagnose the cause of OBDII code B2A04 (Microphone Circuit)?

- Diagnosis involves checking the microphone for physical damage, inspecting the wiring for breaks or shorts, and testing the hands-free calling system for proper functionality.

4. Can I repair OBDII code B2A04 (Microphone Circuit) on my own?

- DIY repair is possible if you have the necessary tools and expertise. Replacing the microphone, repairing damaged wiring, or resetting the hands-free calling system may resolve the issue.

5. Is it safe to continue driving with OBDII code B2A04 (Microphone Circuit) present?

- While driving with this code may not affect vehicle performance, it is recommended to address the issue promptly to restore voice command functionality and ensure safe hands-free calling.

6. Are there any temporary fixes for OBDII code B2A04 (Microphone Circuit)?

- Temporary fixes may include disconnecting and reconnecting the microphone, checking for loose connections, or resetting the hands-free calling system.

7. How do I reset OBDII code B2A04 (Microphone Circuit) after making repairs?

- After repairing the issue, you can reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the error code.

8. How much does it cost to repair OBDII code B2A04 (Microphone Circuit) at a mechanic?

- The cost of repairs can vary depending on the extent of the issue and the labor rates of the mechanic. It may involve replacing the microphone, repairing wiring, or troubleshooting the hands-free calling system.

9. Can a malfunctioning microphone cause other OBDII codes to trigger?

- Yes, a malfunctioning microphone can cause related codes to trigger, such as codes related to the hands-free calling system or communication errors within the vehicle's audio system.

10. How can I prevent OBDII code B2A04 (Microphone Circuit) from reoccurring in the future?

- To prevent the code from reoccurring, regularly check the microphone for damage, ensure proper wiring connections, and follow the manufacturer's maintenance recommendations for the hands-free calling system.