OBD Guide
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B1D79

Microphone Input Circuit General Electrical Failure

B1D79 is an OBD-II diagnostic trouble code meaning: Microphone Input Circuit General Electrical Failure. Common causes: open or short circuit in wiring harness, poor contact in microphone connectors. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Voice control doesn't work
  • Sound quality issues with Bluetooth phone calls
  • Noise canceling system does not function

Causes

  • Open or short circuit in wiring harness
  • Poor contact in microphone connectors
  • Microphone malfunction
  • Control module problem

How to Fix

  1. Check the integrity of the microphone wiring harness
  2. Inspect microphone connectors for oxidation or damage.
  3. Check microphone functionality
  4. Reboot the control module (if applicable)
  5. Replace the microphone or control module if necessary

FAQ

What does the B1D79 code mean?

B1D79 is an OBD-II diagnostic trouble code that indicates: Microphone Input Circuit General Electrical Failure

What causes a B1D79 error code?

The most common causes of B1D79 include: Open or short circuit in wiring harness; Poor contact in microphone connectors; Microphone malfunction; Control module problem.

How do I fix a B1D79 diagnostic trouble code?

To fix B1D79: Check the integrity of the microphone wiring harness. Inspect microphone connectors for oxidation or damage.. Check microphone functionality. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1D79?

Yes, but get it checked soon

How much does it cost to fix B1D79?

The estimated repair cost for B1D79 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat