Engine-Codes.com
Engine-Codes – Generic – B1277:04

B1277:04 Code - Microphone 1 Input Signal Circuit Open/High Resistance

Quick Answer

The B1277:04 diagnostic trouble code (DTC) indicates a problem with the Microphone 1 Input Signal Circuit in the vehicle. Common causes include Damaged or corroded wiring in the microphone circuit, Loose or disconnected connections in the signal path, Faulty microphone unit. 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
B1277:04 indicates Microphone 1 Input Signal Circuit Open/High Resistance.
Common causes
Common causes include Damaged or corroded wiring in the microphone circuit, Loose or disconnected connections in the signal path, Faulty microphone unit.
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 14, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B1277:04 Description

The B1277:04 diagnostic trouble code (DTC) indicates a problem with the Microphone 1 Input Signal Circuit in the vehicle. This code specifically points to an open circuit or high resistance in the signal path of the microphone, which is used for various functions in modern vehicles, such as hands-free calling, voice commands, and voice-activated controls. When this circuit is compromised, it can lead to issues with the vehicle's communication systems and audio controls, affecting the driver's ability to use these features effectively.

OBDII Code B1277:04 - Microphone 1 Input Signal Circuit Open/High Resistance
B1277:04 Code - Microphone 1 Input Signal Circuit Open/High Resistance

Common Causes of B1277:04

  1. Damaged or corroded wiring in the microphone circuit.
  2. Loose or disconnected connections in the signal path.
  3. Faulty microphone unit.
  4. Water damage to the microphone or its components.
  5. Electrical issues in the vehicle's communication systems.

Symptoms of B1277:04

  1. Distorted or muffled audio during phone calls or voice commands.
  2. Inability to use voice-activated controls effectively.
  3. Erratic behavior of the infotainment system.
  4. Loss of functionality in hands-free calling features.
  5. Error messages related to microphone input signal.

How to Fix B1277:04

  1. Begin by inspecting the wiring and connections in the Microphone 1 Input Signal Circuit for any visible damage or corrosion.
  2. Test the microphone unit itself to determine if it is functioning correctly or needs replacement.
  3. Check for any water damage in the microphone or its components, addressing any issues found.
  4. If no visible issues are present, use a multimeter to test the continuity and resistance of the circuit to pinpoint the exact location of the open circuit or high resistance.
  5. Repair or replace any damaged wiring, connections, or components in the Microphone 1 Input Signal Circuit as needed to restore proper functionality.

Cost to Fix B1277:04

The typical repair costs for addressing the B1277:04 code can vary depending on the extent of the issue and the specific repairs needed. In general, the cost of parts for this repair could range from $50 to $200, with labor costs adding an additional $100 to $300. However, it is important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops for more accurate estimates tailored to your specific situation.

What does this mean?

Tech Notes for B1277:04

Installation of aftermarket replacement speakers, additional speakers/subwoofers, or aftermarket exhaust systems can cause undesirable behavior of the active noise cancellation system. The noise reduction microphones have foam blocks above them to seal the microphones and aid in the reduction of headliner vibration. Missing or out of place foam blocks can impact system performance.

When is the Code Detected?

The Diagnostic Trouble Code (DTC) will be set when an open/high resistance is detected in the cellular phone microphone high signal or Microphone 1 circuit for 10 s or greater.

Need more information about the B1277:04 code?

Need more information on how to fix the B1277:04 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1277:04 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 B1277:04 Code

1. What are common symptoms of OBDII code B1277:04 (Microphone 1 Input Signal Circuit Open/High Resistance)?

- Common symptoms include loss of audio from the microphone, poor sound quality, or complete silence during phone calls or voice commands.

2. What can cause the Microphone 1 Input Signal Circuit to have an open or high resistance?

- Possible causes include damaged wiring, loose connections, a faulty microphone, or issues with the audio system's control module.

3. How can I diagnose the Microphone 1 Input Signal Circuit issue related to code B1277:04?

- You can use a multimeter to check for continuity in the wiring, inspect the microphone for physical damage, and perform a visual inspection of the connections for any loose or corroded contacts.

4. Are there any simple repairs I can attempt to fix the Microphone 1 Input Signal Circuit problem?

- Yes, you can start by checking and reseating any loose connections, repairing damaged wiring, or replacing the microphone if it is found to be faulty.

5. Will resetting the OBDII code B1277:04 make the issue with the Microphone 1 Input Signal Circuit go away?

- Resetting the code may temporarily clear the error message, but it will not fix the underlying problem causing the open or high resistance in the microphone circuit.

6. Can a DIY enthusiast without much technical knowledge fix the Microphone 1 Input Signal Circuit issue?

- Depending on the root cause, some simple repairs like checking connections or replacing the microphone can be attempted by a DIY enthusiast. However, more complex issues may require professional assistance.

7. Is it safe to continue driving with OBDII code B1277:04 (Microphone 1 Input Signal Circuit Open/High Resistance)?

- While the issue may not directly affect the vehicle's performance, it can impact your ability to use hands-free calling features or voice commands. It is recommended to address the problem to ensure safe and convenient driving.

8. How much does it typically cost to repair the Microphone 1 Input Signal Circuit issue related to OBDII code B1277:04?

- The cost of repairs can vary depending on the extent of the problem and whether professional assistance is needed. Simple fixes like reconnecting wires may cost less compared to replacing a faulty microphone or control module.

9. Are there any preventive measures to avoid encountering OBDII code B1277:04 in the future?

- Regularly inspecting and maintaining the audio system components, ensuring proper installation of aftermarket devices, and handling the wiring carefully can help prevent issues with the Microphone 1 Input Signal Circuit.

Discuss the causes and fixes for B1277:04 OBDII Code

Submit a New Comment

Code B1277:04 comments

No comments found for this page.