OBD Guide
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B125A

Antenna Signal Circuit

B125A is an OBD-II diagnostic trouble code meaning: Antenna Signal Circuit. Common causes: open or short circuit in wiring harness, antenna malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Airbag light comes on
  • The passive safety system may not work in an accident.

Causes

  • Open or short circuit in wiring harness
  • Antenna malfunction
  • Problems with the restraint control module
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Check the antenna for functionality
  3. Check contacts for corrosion
  4. Replacing faulty components

Related codes

B125BB125C

FAQ

What does the B125A code mean?

B125A is an OBD-II diagnostic trouble code that indicates: Antenna Signal Circuit

What causes a B125A error code?

The most common causes of B125A include: Open or short circuit in wiring harness; Antenna malfunction; Problems with the restraint control module; Contact corrosion.

How do I fix a B125A diagnostic trouble code?

To fix B125A: Check wiring harness for damage. Check the antenna for functionality. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B125A?

Do not drive — repair immediately

How much does it cost to fix B125A?

The estimated repair cost for B125A is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat