OBD Guide
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B127C

Microphone 2 Input Signal Circuit

B127C is an OBD-II diagnostic trouble code meaning: Microphone 2 Input Signal Circuit. Common causes: open or short circuit in microphone wiring harness, poor contact in the microphone jack. Estimated repair cost: $6–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Voice control doesn't work
  • Problems with call quality in hands-free mode
  • The noise reduction system is not functioning correctly

Causes

  • Open or short circuit in microphone wiring harness
  • Poor contact in the microphone jack
  • Microphone malfunction
  • Problems with the audio control unit
  • Software system failure

How to Fix

  1. Diagnose the voice control system
  2. Check the integrity of the microphone wiring harness
  3. Inspect and clean the microphone connector contacts
  4. Test the microphone for malfunction
  5. Replace the microphone if necessary
  6. Update system software

Related codes

B127BB127D

FAQ

What does the B127C code mean?

B127C is an OBD-II diagnostic trouble code that indicates: Microphone 2 Input Signal Circuit

What causes a B127C error code?

The most common causes of B127C include: Open or short circuit in microphone wiring harness; Poor contact in the microphone jack; Microphone malfunction; Problems with the audio control unit.

How do I fix a B127C diagnostic trouble code?

To fix B127C: Diagnose the voice control system. Check the integrity of the microphone wiring harness. Inspect and clean the microphone connector contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B127C?

Yes, but get it checked soon

How much does it cost to fix B127C?

The estimated repair cost for B127C is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat