OBD Guide
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B2A04

Microphone Circuit

B2A04 is an OBD-II diagnostic trouble code meaning: Microphone Circuit. Common causes: open or short circuit in microphone circuit, microphone malfunction. Estimated repair cost: $56–167.

Severity
✅ Low
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Noise cancellation doesn't work
  • Voice commands are not recognized
  • Possible interference in the audio system

Causes

  • Open or short circuit in microphone circuit
  • Microphone malfunction
  • Wiring Harness Problems
  • Control unit malfunction

How to Fix

  1. Check the integrity of the wires in the microphone circuit
  2. Test the microphone for serviceability
  3. Check connectors and contacts for oxidation
  4. Program or replace the control unit if necessary

Related codes

B2A03B2A05

FAQ

What does the B2A04 code mean?

B2A04 is an OBD-II diagnostic trouble code that indicates: Microphone Circuit

What causes a B2A04 error code?

The most common causes of B2A04 include: Open or short circuit in microphone circuit; Microphone malfunction; Wiring Harness Problems; Control unit malfunction.

How do I fix a B2A04 diagnostic trouble code?

To fix B2A04: Check the integrity of the wires in the microphone circuit. Test the microphone for serviceability. Check connectors and contacts for oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2A04?

Do not drive — repair immediately

How much does it cost to fix B2A04?

The estimated repair cost for B2A04 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat