OBD Guide
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C191B

Rear Vehicle Speed Signal

C191B is an OBD-II diagnostic trouble code meaning: Rear Vehicle Speed Signal. Common causes: rear wheel speed sensor malfunction, wiring harness damage. Estimated repair cost: $56–167.

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

Symptoms

  • Incorrect ABS operation
  • Activating the warning light on the dashboard
  • Problems with the stabilization system

Causes

  • Rear wheel speed sensor malfunction
  • Wiring harness damage
  • Problems with the sensor connector
  • ABS module malfunction

How to Fix

  1. Check rear wheel speed sensor
  2. Inspect the wiring harness for damage
  3. Check the sensor connector for oxidation or damage
  4. If necessary, replace the sensor or wiring harness

Related codes

C191AC191CC0035

FAQ

What does the C191B code mean?

C191B is an OBD-II diagnostic trouble code that indicates: Rear Vehicle Speed Signal

What causes a C191B error code?

The most common causes of C191B include: Rear wheel speed sensor malfunction; Wiring harness damage; Problems with the sensor connector; ABS module malfunction.

How do I fix a C191B diagnostic trouble code?

To fix C191B: Check rear wheel speed sensor. Inspect the wiring harness for damage. Check the sensor connector for oxidation or damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C191B?

Do not drive — repair immediately

How much does it cost to fix C191B?

The estimated repair cost for C191B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat