OBD Guide
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B15C2

Speed Signal Malfunction

B15C2 is an OBD-II diagnostic trouble code meaning: Speed Signal Malfunction. Common causes: faulty wheel speed sensor or gearbox, open or shorted wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • The passive safety system fault indicator is on
  • Incorrect operation of belt pretensioners
  • Errors in the operation of airbags

Causes

  • Faulty wheel speed sensor or gearbox
  • Open or shorted wiring harness
  • Problems with the restraint control module
  • Corrosion or poor contact in connectors

How to Fix

  1. Check speed sensors for functionality
  2. Inspect the wiring harness for damage
  3. Check connectors and contacts for corrosion
  4. Scan the control module for additional errors
  5. If necessary, replace faulty components

Related codes

B15C1B15C3U0121

FAQ

What does the B15C2 code mean?

B15C2 is an OBD-II diagnostic trouble code that indicates: Speed Signal Malfunction

What causes a B15C2 error code?

The most common causes of B15C2 include: Faulty wheel speed sensor or gearbox; Open or shorted wiring harness; Problems with the restraint control module; Corrosion or poor contact in connectors.

How do I fix a B15C2 diagnostic trouble code?

To fix B15C2: Check speed sensors for functionality. Inspect the wiring harness for damage. Check connectors and contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B15C2?

Do not drive — repair immediately

How much does it cost to fix B15C2?

The estimated repair cost for B15C2 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat