OBD Guide
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B1899

Microphone Input Signal Circuit Open

B1899 is an OBD-II diagnostic trouble code meaning: Microphone Input Signal Circuit Open. Common causes: broken or damaged wiring harness, microphone malfunction. Estimated repair cost: $22–111.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Voice control doesn't work
  • No sound in the hands-free system
  • Noise reduction system malfunction

Causes

  • Broken or damaged wiring harness
  • Microphone malfunction
  • Poor contact in the connector
  • Problems with the on-board computer

How to Fix

  1. Check the integrity of the microphone wiring harness
  2. Inspect connectors for oxidation or damage
  3. Check microphone operation
  4. If necessary, replace the microphone or repair the wiring harness

Related codes

B1888B1890B1895

FAQ

What does the B1899 code mean?

B1899 is an OBD-II diagnostic trouble code that indicates: Microphone Input Signal Circuit Open

What causes a B1899 error code?

The most common causes of B1899 include: Broken or damaged wiring harness; Microphone malfunction; Poor contact in the connector; Problems with the on-board computer.

How do I fix a B1899 diagnostic trouble code?

To fix B1899: Check the integrity of the microphone wiring harness. Inspect connectors for oxidation or damage. Check microphone operation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1899?

Yes, but get it checked soon

How much does it cost to fix B1899?

The estimated repair cost for B1899 is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat