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Engine-Codes – Generic – B1277:02

B1277:02 Code - Microphone 1 Input Signal Circuit Short to Ground

Quick Answer

The B1277:02 diagnostic trouble code indicates a problem with the Microphone 1 Input Signal Circuit being shorted to ground in the vehicle's system. Common causes include Damaged wiring or connectors in the microphone circuit, Faulty microphone component, Short circuit in the wiring harness. 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
B1277:02 indicates Microphone 1 Input Signal Circuit Short to Ground.
Common causes
Common causes include Damaged wiring or connectors in the microphone circuit, Faulty microphone component, Short circuit in the wiring harness.
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 11, 2024
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Code B1277:02 Description

The B1277:02 diagnostic trouble code indicates a problem with the Microphone 1 Input Signal Circuit being shorted to ground in the vehicle's system. In modern vehicles, microphones are used for various functions such as hands-free calling, voice command systems, and vehicle diagnostics. When this circuit is shorted to ground, it can lead to issues with communication systems, entertainment systems, and potentially impact safety features that rely on audio input.

OBDII Code B1277:02 - Microphone 1 Input Signal Circuit Short to Ground
B1277:02 Code - Microphone 1 Input Signal Circuit Short to Ground

Common Causes of B1277:02

  1. Damaged wiring or connectors in the microphone circuit
  2. Faulty microphone component
  3. Short circuit in the wiring harness
  4. Water or moisture damage affecting the microphone system
  5. Electrical issues in the vehicle's audio system

Symptoms of B1277:02

  1. Loss of audio input for hands-free calling or voice command systems
  2. Distorted sound or noise interference when using the microphone
  3. Inability to activate certain vehicle features that rely on audio input
  4. Error messages related to microphone malfunction on the vehicle's display
  5. Disrupted communication with passengers through in-car communication systems

How to Fix B1277:02

  1. Begin by diagnosing the specific cause of the short circuit by inspecting the microphone, wiring, and connectors for any visible damage.
  2. Test the microphone itself to determine if it is functioning correctly or needs replacement.
  3. Check the wiring harness for any signs of wear, corrosion, or damage that may be causing the short to ground.
  4. Repair or replace any damaged wiring, connectors, or components in the microphone circuit.
  5. Clear the diagnostic trouble code from the vehicle's system and test the microphone to ensure it is functioning properly.

Cost to Fix B1277:02

The cost of repairing a Microphone 1 Input Signal Circuit Short to Ground issue can vary depending on the extent of the damage and the specific components that need replacement. On average, the repair cost for this issue can range from $100 to $300, including parts and labor. However, it's essential to consider that diagnosis time and labor rates can vary between auto repair shops, so it's recommended to obtain quotes from multiple sources to get a more accurate estimate. Additionally, factors such as the vehicle make and model, location, and the severity of the issue can impact the final repair cost.

What does this mean?

Tech Notes for B1277:02

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 a short to ground is detected in the cellular phone microphone high signal or Microphone 1 circuit for 10 s or greater.

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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.

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