OBD Guide
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B127D

Microphone 3 Input Signal Circuit

B127D is an OBD-II diagnostic trouble code meaning: Microphone 3 Input Signal Circuit. Common causes: open or short circuit in microphone 3 circuit, poor contact in connectors. Estimated repair cost: $56–167.

Severity
✅ Low
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Voice control doesn't work
  • Problems with noise reduction in Hands-free
  • Error message on display

Causes

  • Open or short circuit in microphone 3 circuit
  • Poor contact in connectors
  • Microphone 3 fault
  • Problems with the control unit

How to Fix

  1. Check the integrity of the wires and contacts in the microphone circuit 3
  2. Clean contacts from corrosion
  3. Replace microphone 3 if necessary
  4. Check and update the control unit software

Related codes

B127CB127EU1000

FAQ

What does the B127D code mean?

B127D is an OBD-II diagnostic trouble code that indicates: Microphone 3 Input Signal Circuit

What causes a B127D error code?

The most common causes of B127D include: Open or short circuit in microphone 3 circuit; Poor contact in connectors; Microphone 3 fault; Problems with the control unit.

How do I fix a B127D diagnostic trouble code?

To fix B127D: Check the integrity of the wires and contacts in the microphone circuit 3. Clean contacts from corrosion. Replace microphone 3 if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B127D?

Limited driving only, diagnose soon

How much does it cost to fix B127D?

The estimated repair cost for B127D is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat